E c o l o g i c a lA pp l i c a t i o n s,2 5 ( 1 ) ,2 0 1 5 ,pp .2 2 6–2 4 2 2 0 1 5b yth eE co lo g i c a lSo c i e t yo f Am e r i c a G ab r i e lI .Yo sp in ,S co t tD .B r id gh am ,Ron a ldP .N e i l son ,JohnP .Bo l t e , Dom in iqu eM .B a ch e l e t ,P e t e rJ .Gou ld ,Con s t an c eA .H a r r in g ton ,J an e A .K e r t i s ,Cod yE v e r s ,andB a r tR .John son2 0 1 5 .An ew mod e lto s imu l a t ec l im a t e ch an g e imp a c t sonfo r e s tsu c c e s s ionfo r lo c a l l and m an a g em en t .E co lo g i c a lApp l i c a t ion s2 5 : 2 2 6– 2 4 2 . h t tp : / /d x .do i .o r g /10 .1890 /13 -0906 .1 An ew m o d e lt os im u l a t ec l im a t e c h a n g eim p a c t so nf o r e s t s u c c e s s i o nf o rl o c a ll a n dm a n a g em e n t 1 , 1 0 2 3 4 5 GABRIEL I .Y OSP IN, S COTT D .BRIDGHAM, RONALD P . NEILSON, J OHN P .BOLTE, DOMINIQUE M .BACHELET, 6 7 8 9 PETER J .G OULD,CONSTANCE A . HARRINGTON, J ANE A . KERTIS, CODY EVERS, AND BART R .JOHNSON9 1 In s t i tu t eonE c o s y s t em s ,M o n t a n aS t a t eU n i v e r s i t y ,1 0 6A JMJ o h n s o nH a l l ,B o z em a n ,M o n t a n a5 9 7 1 7 3 4 9 0 USA En v i ronm e n ta lS c i en c e sI n s t i t u t ea n dI n s t i t u t eo fE c o l o g ya n dE v o l u t i o n ,U n i v e r s i t yo fO r e g o n ,5 2 8 9U n i v e r s i t yo fO r e g o n ,E u g e n e , O r e g o n9 7 4 0 3 USA 3 Bo tanyandP l a n tP a t h o l o g y ,O r e g o nS t a t eU n i v e r s i t y ,1 8 9 5S .W .W h i t e s i d eD r i v e ,C o r v a l l i s ,O r e g o n9 7 3 3 3 USA 4 B i o l o g i c a la n dE c o l o g i c a lE n g i n e e r i n g ,O r e g o nS t a t eU n i v e r s i t y ,C o r v a l l i s ,O r e g o n9 7 3 3 1 USA 5 Con s e r v a t i o nB i o l o g yI n s t i t u t e ,1 3 6SW W a s h i n g t o nA v e n u e ,S u i t e2 0 2 ,C o r v a l l i s ,O r e g o n9 7 3 3 3 USA 6 Wa sh ing ton D e p a r tm e n to fN a t u r a lR e s o u r c e s ,1 1 1 1W a s h i n g t o nS t r e e tSE ,O l ym p i a ,W a s h i n g t o n9 8 5 0 4 7 0 1 4 USA 7 USDAFo r e s tS e r v i c e ,P a c ifi cN o r t hw e s tR e s e a r c hS t a t i o n ,3 6 2 59 3 r dA v e n u eSW ,O l ym p i a ,W a s h i n g t o n9 8 5 1 2 -9 1 9 3 USA 8 USDAF o r e s tS e r v i c e ,S i u s l aw N a t i o n a lF o r e s t ,3 2 0 0SWJ e f f e r s o nW a y ,C o r v a l l i s ,O r e g o n9 7 3 3 1 USA 9 Land s c a p eA r c h i t e c t u r e ,U n i v e r s i t yo fO r e g o n ,5 2 3 4U n i v e r s i t yo fO r e g o n ,E u g e n e ,O r e g o n9 7 4 0 3 USA 2 Ab s t ra c t. W ed ev e lop edan ewc l im a t e s en s i t i v ev e g e t a t ions t a t e and t r an s i t ions imu l a t ion mod e l(CV -STSM )tos imu la t efu tu r ev e g e t a t iona tafin esp a t i a lg r a incomm en su r a t e w i thth es ca l e so f humanland -u s ed e c i s ion s ,and und e rth ejo in tinflu en c e so fch an g in g c l ima t e ,s i t ep rodu c t iv i ty ,andd i s tu rban c e . CV -STSMin t e g r a t e sou tpu t sf romfou rd i f f e r en t mod e l ingsy s t em s .Su c c e s s iona lchang e sint r e esp e c i e scompo s i t ionands t ands t ru c tu r ew e r e r ep r e s en t eda st ran s i t ionp robab i l i t i e sando r g an i z edin toas t a t e and t r an s i t ions imu l a t ion mod e l .S ta t e sw e r echa ra c t e r i z edba s edona s s e s sm en t so fbo thcu r r en tv e g e t a t ionando f p ro j e c t edfu tu r ev eg e ta t ionf rom a d yn am i cg lob a lv e g e t a t ion mod e l(DGVM ) .S t a t e d efin i t ion sin c lud edsu ffi c i en td e ta i ltosuppo r tth ein t e g r a t iono f CV -STSM w i thana g en t ba s ed mod e lo fland -u s ed e c i s ion sanda m e ch an i s t i c mod e lo ffi r eb eh a v io randsp r e ad . T ran s i t ionp robab i l i t i e sw e r epa ram e t e r i z edu s in gou tpu tf romas t andb iom e t r i c mod e lrun a c ro s saw id erang eo fs i t ep rodu c t iv i t i e s .B io g eo g r aph i candb io g eo ch em i c a lp ro j e c t ion sf rom th e DGVM w e r eu s edtoad ju s tth et r an s i t ionp rob ab i l i t i e stoa c coun tfo rth eimp a c t so f c l ima t echang eons i t ep rodu c t iv i tyandpo t en t i a lv e g e t a t iont yp e .W econdu c t ede xp e r im en t a l s imu la t ion sinth eW i l lam e t t e Va l l ey ,O r e gon , USA . Ou rs imu l a t ionl and s c ap ein co rpo r a t ed d e ta i l edn ewa s s e s sm en t so fc r i t i ca l lyimp e r i l ed O r e gonwh i t eo ak(Q u e r c u sg a r r y a n a)s a v ann a andp ra i r i ehab i ta t samongth esu i t eo fex i s t in gandfu tu r ev e g e t a t iont yp e s .Th ee xp e r im en t a l d e s ignfu l lyc ro s s edfou rfu tu r ec l ima t es c en a r io sw i thth r e ed i s tu rb an c es c en a r io s .CV -STSM show eds t rongin t e ra c t ion sb e tw e en c l im a t e and d i s tu rb an c es c en a r io s .A l ld i s tu rb an c e s c ena r io sin c r ea s edth eabundan c eo fo aks a v ann ah ab i t a t ,bu tanin t e r a c t ionb e tw e enth e mo s tin t en s ed i s tu rban c e andc l ima t e ch an g es c en a r io sa l soin c r e a s edth e abund an c eo f sub t rop i ca lt r e esp e c i e s .Ev enso ,sub t rop i c a lt r e esp e c i e sw e r ef a rl e s sabund an ta tth eendo f s imu la t ion sin CV -STSMthaninth ed yn am i cg lob a lv e g e t a t ion mod e ls imu l a t ion s . Ou r r e su l t sind i ca t etha t dynam i cg loba lv e g e t a t ion mod e l sm a yo v e r e s t im a t efu tu r er a t e so f v eg e ta t ionchang e ,e sp e c ia l lyinth eab s en c eo fs t and r ep l a c in gd i s tu rb an c e s . Mod e l in gtoo l s su ch a s CV -STSMtha ts imu la t era t e s and d i r e c t ion o fv e g e t a t ion ch an g ea f f e c t ed b y in t e ra c t ion sandf e edba ck sb e tw e enc l im a t eandl and -u s ech an g ec anh e lppo l i c ym ak e r s ,l and manag e r s ,andso c i e tya sawho l ed ev e lope f f e c t i v ep l an stoad ap ttor ap id l ych an g in gc l im a t e . K ey w o r d s : a g e n t b a s e dm o d e l ;d i s t u r b a n c e ;d y n am i cg l o b a lv e g e t a t i o nm o d e l ;E n v i s i o n ;fi r e ; MC 1 ; O r egon ;s t a t e a n d t r a n s i t i o ns im u l a t i o nm o d e l ;W i l l am e t t eV a l l e y. I NTRODUCT ION Human a c t iv i t i e s dom ina te and a l t e rt e r r e s t r ia l e co sy s t em dynam i c sth rough bo th an th ropog en i cc l i m a t echang eandland -u s echang e ,amongo th e rfa c to r s (V i tou s eke ta l .1997 ) . Chang e sinlandu s eandl and Manu s c r ip tr e c e iv ed1 5M a y2 0 1 3 ;r e v i s ed2 1F eb ru a r y2 0 1 4 ; a c c ep t ed28 May20 1 4 ; fin a lv e r s ionr e c e i v ed2 0Jun e2 0 1 4 . Co r r e spond ingEd i to r :K .A .H ibb a rd . 1 0E -ma i l : Gab r i e l .Yo sp in@mon tana . edu co v e rcon t r ibu t etocomp l e xf e edb a ck sb e tw e enhum an a c t i v i t i e sande co s y s t em sinsp a c eandt im e(F a rb e re ta l . 2 006 ) .P ro j e c t ingth ein t e ra c t iv ee f f e c t so fc l ima t e ch an g e andl and -u s ed e c i s ion si sth e r e fo r ec ru c i a lto m an a g in ge co s y s t em s(K e an ee ta l .2 0 0 4 ) . To doso e f f e c t i v e l yr equ i r e sm e ch an i s t i cs imu l a t ion so fc l im a t e ch an g e ,l and m an a g em en t ,e co lo g i c a lsu c c e s s ion , and d i s tu rb an c ea tafin esp a t i a lg r a incomm en su r a t ew i th th es c a l e sa t wh i chhum and e c i s ion -m ak in gt ak e sp l a c e (Bon ee ta l .2 0 1 3 ,K e an ee ta l .2 0 1 3 ,K in ge ta l .2 0 1 3 ) . 2 2 6 Janua ry2015 S IMULATED CL IMATEIMPACTS ON VEGETAT ION Dynam i cg loba lv eg e ta t ion mod e l s(DGVM s )a r ea l ead ing waytoeva lua t eth e po t en t ia lfo rchang e sin v eg e ta t ionund e rfu tu r ec l ima t e chang es c ena r io s(Ku cha r ike ta l .2006 , Gav ine ta l .2007 ,L i t t e l le ta l .20 10 ) . Th e s e mod e l sa r ed iv e r s e , bu tin g en e ra lin c lud e b iog eo ch em i ca l ,phy s io log i ca l ,andd i s tu rban c em e ch an i sm stos imu la t echang e sinv eg e ta t ion(Moo r c ro f t 2006 ) . DGVM shav ea l sob e enu s eda tr eg iona ls ca l e s to p rov id e pub l i c and p r iva t eland manag e r sb e t t e r in fo rma t iononhowc l ima t ea f f e c t sv eg e ta t ion(Ko cae t a l .2006 , Rog e r se ta l .2011 ) .Tob eg loba l lyapp l i cab l e , how ev e r , DGVM s mu s ts imp l i fyth e i rr ep r e s en ta t iono f v eg e ta t ion andland s cap e s . Mo s t DGVM sd e s c r ib e v eg e ta t ioninb roadp lan tfun c t iona ltyp e sandphy s i ognom i cg roup s , ra th e rthan sp e c i fy ingind iv idua l p lan tsp e c i e sandv eg e ta t ioncommun i t i e s(Ba ch e l e te t a l .2001 ) . Wh i l esom e DGVM s mayin c lud e mana g e m en t(A lban ie ta l .2006 ) , manag em en ti sno ts imu la t ed m e chan i s t i ca l lyba s edonhumand e c i s ionp ro c e s s e s .In add i t ion , mo s t DGVM su s e aspa t ia lg ra intha ti s coa r s e r than th e spa t ia lg ra in a t wh i chland -u s e d e c i s ion sa r e mad e(Hu r t te ta l . 1998 ) . Su c c e s s fu l mod e l ingp ro j e c t shav ein co rpo ra t edland -manag em en t chang e sin to c l ima t e s en s i t iv ev eg e ta t ion mod e l ing (S ch e l l e r and M lad eno f f 2005 ,S ch e l l e re ta l . 20 07 ) , bu tth e s ep ro j e c t sa r el im i t edbyhav ingg r idd edspa t ia l un i t stha tdono tcon fo rmtound e r ly ingtopog raph i c va r ia t ion , and a r e no t ab l eto mov e dynam i ca l ly b e tw e en‘ ‘na tu ra l ’ ’and‘ ‘d ev e lop ed ’ ’landcov e r .P lan t commun i tys t ru c tu r eandcompo s i t iona r eth edynam i c p rodu c t so fsp e c i e s sp e c ifi cp lan tg row thand mo r ta l i ty a sd e t e rm in ed bylo ca l env i ronm en ta l cond i t ion s , nonan th ropog en i cd i s tu rban c e s ,andhumaninflu en c e s . To th e ex t en t tha t DGVM sl im i t th e dynam i c r ep r e s en ta t ion o fth e s ep ro c e s s e s ,ands imu la t eth em coa r s e ly , nonm e chan i s t i ca l ly ,o r no ta ta l l , th e i r p ro j e c t ion sa r e un l ik e lyto p r ed i c tfu tu r ev eg e ta t ion dynam i c sa c cu ra t e ly . Fu r th e rmo r e , DGVM s mu s t‘ ‘ sp in -up ’ ’to equ i l i b ra t e ca rbon and nu t r i en t poo l s , andth en p r ed i c t po t en t ia lv eg e ta t ion dynam i c sf rom th e sp e c ifi ed c l ima t eandso i linpu t s . Cu r r en tv eg e ta t ion ,how ev e r , i so f t ens t rong lyd e t e rm in edbyth el ega cyo fp r ev iou s land u s e andland cov e r .P r io r i ty e f f e c t s can b e impo r tan td e t e rm inan t so ffu tu r esu c c e s s iona ldynam i c s(P f e i f e r -M e i s t e re ta l .2012 ) . Thu s , DGVM s ma y p rov id ep ro j e c t ion stha tfu r th e rd iv e rg ef romcu r r en t andfu tu r econd i t ion si fth e i ra s s e s sm en to fg row ing cond i t ion s do e s no t ma t ch tha to f th e cu r r en t land s cap e(Van Vuu r ene ta l .2011 ) . Fo rth e s er ea son s ,th r e ee co log i ca l mod e l inginno v a t ion s wou ldsub s tan t ia l ly advan c es imu la t ion so fc l i ma t e chang e impa c t s on v eg e ta t ion in human dom ina t edland s cap e s . Th efi r s ti stocoup l e DGVM p ro j e c t ion sw i th mod e l stha top e ra t ea tsu ffi c i en t l yfin e spa t ia lg ra in stoin co rpo ra t eland -u s ed e c i s ion s and d i s tu rban c e s .Th es e condi stou s ecu r r en tv eg e ta t iona s as ta r t ingpo in tfo rfu tu r es imu la t ion s . Th eth i rdi sto 2 2 7 in t e g r a t em e ch an i s t i c mod e l so fl and m an a g em en tand w i ldfi r ew i th a v e g e t a t ion mod e la tth es am eh i gh r e so lu t ionsp a t i a ls c a l e . Toinv e s t ig a t e howchan g e sinc l im a t eand po l i cy m igh tin t e ra c ttoinflu en c ev eg e ta t ion dynam i c s ,w e d ev e lop edan ew mod e l ingtoo l ,th eC l ima t e s en s i t iv e V eg e ta t ion S ta t e -and -T ran s i t ion S imu la t ion Mod e l (CV -STSM ) . Ou r imp l em en ta t ion o f CV -STSM a ch i ev e sth eth r e einnova t ion sid en t ifi ed abov e . Th e n ew mod e lin t e g ra t e scompon en t sand ou tpu t sf rom fou r mod e l ingsy s t em stos imu la t eth ein t e ra c t ion so f c l im a t e chang e and hum anland -u s ed e c i s ion s on v eg e ta t ionsu c c e s s ion . CV -STSM(1 )s imu la t e schang e sinv eg e ta t ionp rodu c t iv i tyandp lan tphy s iognom i c typ eba s edonchang e sinc l ima t eu s inga DGVM ,(2 ) l ink sth er e su l tan tp lan tph y s iognom i ctyp e stolo ca l ly r e l evan tp lan tcommun i tytyp e sint e rm so fsp e c i e s compo s i t ion and v eg e ta t ion s t ru c tu r ea sd efin ed w i th in a s ta t e -and t ran s i t ion s imu la t ion mod e l (STSM ) ,(3 )a l low sfo rg row th o f , andcomp e t i t ion among ,t r e e sp e c i e sto d r iv ev eg e ta t ion su c c e s s ion u s ing a s tand b iom e t r i c mod e l , and (4 ) suppo r t s m e chan i s t i cs imu la t ion so f humanland -u s ed e c i s ion mak ing th rough a spa t ia l ly exp l i c i t ag en t -ba s ed mod e l . Th er e su l t ing mod e li ssp a t ia l lyexp l i c i t and p robab i l i s t i c ,a l low ingfo rex am ina t iono fchang e sin landcov e rov e rd e c ad e s , wh i l er e ta in in gd e t e rm in i s t i c chang e sinfu tu r ec l ima t eandth e DGVM ’ sv eg e ta t ion c la s s e s . R ep e a t eds imu l a t ion sw i thth e mod e la l low ede xp lo r a t iono fab ro adr an g eo fpo t en t i a lfu tu r econd i t ion s .In th efo l low in gs e c t ion ,w ed e s c r ib eth ed e v e lopm en to f CV -STSMandi t scompon en t s .W eth end e s c r ib eas e r i e s o fs imu l a t ion su s in g CV -STSMinth esou th e rn W i l l am e t t eV a l l e y ,O r e gon , USA , wh e r er e g ion a lp l ann in g e f fo r t sh a v er e c en t l yfo cu s edonc l im a t ech an g eandth e con s e r v a t iono fc r i t i c a l l yimp e r i l eds a v ann aandp r a i r i e e co s y s t em s . Th es imu l a t ion sd emon s t r a t e CV -STSM ’ s fun c t ion a l i t ya c ro s sar an g eo fc l im a t e ch an g es c en a r io s andl e v e l so fl and s c ap ed i s tu rb an c efo rth e com in g c en tu r y . MATERIALS AND METHODS M o d e ld e s i g n CV -STSMin t e g r a t e sinpu t sandou tpu t sf rome x i s t in g mod e l sandin co rpo r a t e sth emw i th inah i gh l yad ap t ab l e s ta t e -and t ran s i t ion s imu la t ion -mod e l ing f ram ewo rk (F i g .1A ) .Inth efo l low in gsub s e c t ion s ,w ed e s c r ib eth e g en e r a l mod e ls t ru c tu r e ,andth end e s c r ib e mod ifi c a t ion s and p a r am e t e r i z a t ion sfo r ou rs tud ya r e a( s e eM o d e l end i c e s Aand B ) . Th e r ea r e p a r am e t e r i z a t i o nand App num e rou sf a c e t stoou rl a r g e r mod e l in gf r am ewo rk(F i g . 1B ) .Inth i sp ap e r ,w efo cu sonth ev e g e t a t ion -mod e l in g compon en t ,wh i chc anrunind ep end en t l yf romth eo th e r compon en t s . Spa t ia lf ram ewo rk.—Toin c lud e m e chan i s t i c and sp a t i a l l ye xp l i c i tl and -u s ed e c i s ion -m ak in g ,w e bu i l t CV -STSM a sav e g e t a t ion modu l ew i th inth ea g en t - 2 28 GABR IELI . YOSP INET AL . 1 1 b a s ed mod e l Env i s ion(a va i lab l e on l in e) . Env i s ion op e ra t e sinag eog raph i cin fo rma t ionsy s t em(A r cG IS ; E s r i2009 )env i ronm en t(Bo l t ee ta l .2006 , Gu zye ta l . 2 008 ) . Th ec en t ra lf ea tu r eo f Env i s ioni s aspa t i a l l y e xp l i c i t mod e lo fhumand e c i s ion stha tcanb el ink edto o th e r mod e l s . Th espa t ia lg ra ina t wh i chag en t s mak ed e c i s ion sin Env i s ioni sr e f e r r edtoa sanin t eg ra t ed d e c i s ion un i t ( IDU ) . Ag en t s mak echo i c e sba s edonas e to fa c t ion s ( t e rm ed po l i c i e s )tha ta r e ava i lab l etoth em ,th e i r p rop en s i t i e sfo rd i f f e r en ttyp e so fa c t ion s ,andf e edb a ck s f romth e chang ingland s cap e ,thu sa l low ingfo rth e em e rg en c eo f comp l ex mod e lb ehav io r . An IDU ’ s v eg e ta t ioncanchang edu etoag en td e c i s ion s ,e co lo g i c a l su c c e s s ion ,o rd i s tu rban c e . P lan tcommun i tys ta t ed efin i t ion s.—S ta t e -and t r an s i t ions imu l a t ion mod e l s(STSM s )a r er e la t i v e lys imp l e con c ep tua ld ep i c t ion so f dynam i csy s t em sth a tc an b e r edu c edtoa fin i t e numb e ro fd i s c r e t econd i t ion sand t r an s i t ion samon gth em(Dan i e landF r id2 01 2 ) .STSM s a r ecommon lyu s edinh igh l yapp l i eds e t t in g s ,su cha s fo r e s t ry(H a e fn e r2 00 5 ) .On eadv an t a g eo fSTSM si sth a t th e ya r eh igh l yad ap tab l e .Fo rex amp l e ,u s e r sm ayd efin e p l an tcommun i t i e s byth esp e c ifi cf e a tu r e sth ey d e em impo r t an t ,andfo r wh i ch da taa r ea va i l ab l e . Fo rth i s p ro j e c t ,w e mod ifi ed an ex i s t ing STSMf ram ewo rk d e v e lop edfo rc la s s i f y in gv e g e ta t iontyp e sinth ep ro g r am VDDT(V e g e ta t ion D yn am i c sD ev e lopm en tToo l ;ESSA T e chno lo g i e s , Van couv e r ,B r i t i sh Co lumb i a , Canad a ) , wh i chi sw id e ly u s edin e co log i c a l mana g em en t . W e d efin edp l an tcommun i tys t a t e sba s edonfou rcha ra c t e r i s t i c s :dom inan tandsubdom in an tt r e esp e c i e s ,quad r a t i c m ean s t em d iam e t e r , canopy c lo su r e , and canopy l a y e r in g ,a si scommoninfo r e s t ryapp l i ca t ion s . T ran s i t ion p robab i l i tyin i t ia l i za t ion.—Emp i r i ca ld a t a andexp e r tjudgm en t mayb eu s edtoin i t ia l i z et ran s i t ion s inanSTSM(S can lan1994 ,C z embo rand V e sk2 0 0 9 , D an i e landF r id2012 ,K e rn se ta l .2012 ) . Add i t iona l l y , t ran s i t ion s mayb ed e t e rm in i s t i co rp robab i l i s t i c .InCV STSM ,a l lt ran s i t ion sa r ep robab i l i s t i c . W eu s edth e Fo r e s tV eg e ta t ion S imu la to r(FVS ; C rook s ton and D ixon2005 )tog en e ra t eth ein i t ia lt ran s i t ionp robab i l i t i e sfo rCV -STSMba s edonp lo t l ev e lda taf romal a r g e numb e ro ffo r e s ts tand s(Mo eu rand Vand end r i e s ch e va i l a b l e 2 010 ,W e i s zand Vand end r i e s ch e2012 ;FVSi sa 1 2 FVS wa sd ev e lop ed byth e Un i t ed S t a t e s o n l in e) . Fo r e s tS e rv i c eandi sw id e lyu s edth roughou tth e Un i t ed S ta t e s . FVS p ro j e c t sfo r e s td ev e lopm en t ba s ed on r eg iona l lyd e r iv eds ta t i s t i ca lr e la t ion sh ip s ,u s ingl i s t so f t r e e s( sp e c i e s ,s i z e ,andcond i t ion )a s bo thinpu tand ou tpu t .T r e eg row th and mo r ta l i ty p ro j e c t ion sa r e la rg e ly d e t e rm in i s t i c fo r any g iv en t r e el i s t . W e a s s emb l edt r e el i s t sf rom mu l t ip l eex i s t ingda tasou r c e s tocap tu r eva r iab i l i tyw i th inea chv eg e ta t ions ta t e ;th e s e y i e ld ed d i f f e r en ts tand d ev e lopm en ta lt ra j e c to r i e sand 1 1h t tp : / / env i s ion .b io e .o r s t . edu 1 2h t tp : / /www . f s . f ed .u s / fm s c / fv s / E co log i ca l App l i ca t ion s Vo l .25 , No .1 a l low edu stoc a l cu l a t et r an s i t ionp rob ab i l i t i e sin too th e r s t a t e s .Th et r e el i s t sc ap tu r ee x i s t in gv e g e t a t iona sw e l la s r ep r e s en t a t ion so f po t en t i a lfu tu r es t andt yp e s and g row th cond i t ion s . FVS r ep r e s en t ss i t ep rodu c t i v i t y u s in gs i t eind e x(S I ) , wh i chi sth eh e i gh ttowh i chat r e e o far ep r e s en t a t i v esp e c i e sg row sin5 0y e a r s . Fo rou r s tud ya r e a ,th er ep r e s en t a t i v e sp e c i e si s Dou g l a s -fi r ( P s e u d o t s u g am e n z i e s i i (M i rb . )F r an co ) .S Ii su s edto p r ed i c tth ee f f e c t so fp rodu c t i v i ty ont r e eg row th , comp e t i t ion , and mo r ta l i ty . W e va r i ed S Iin ou r p a ram e t e r i za t ion s imu la t ion sto a c coun tfo r sp a t i a l d i f f e r en c e sin S Iandch an g e sin p rodu c t i v i t y du eto c l im a t ech an g e ,a sd e s c r ib edb r i efl yin K e rn se ta l .( 2 0 1 2 ) andinth efo l low in gs e c t ion . T r a n s i t i o np r o b a b i l i t ym o d ifi c a t i o n sa n dem e r g e n c eo f n o v e lc omm u n i t i e s.—B e c au s eFVSa s sum e sanun ch an g in gc l im a t e ,w eu s ede s t im a t e so fs i t ep rodu c t i v i t yand p lan t commun i tytyp e sf romth e DGVM MC1 ,a d yn am i cv e g e t a t ion mod e ld e v e lop ed b yth e USDA (B a ch e l e te ta l .2 0 0 1 ,L en ih ane ta l .2 0 0 8 ) ,toad ju s t t r an s i t ionp rob ab i l i t i e sinCV -STSMo v e rt im e(K e rn se t 1 3 MC1 ’ s a l . 2012 , Yo sp in 2012 ;a va i lab l e on l in e) . p ro j e c t ion sa r es en s i t i v etoch an g e sininpu tv a r i ab l e s ( e . g . ,c l im a t eandso i l sd a t a ) , mod e lp a r am e t e r s( e . g . , s en s i t i v i t yo fp rodu c t i v i t ytoch an g in ga tmo sph e r i cCO 2 con c en t ra t ion ) , and em e rg en tp rop e r t i e s( e .g . ,fi r e d i s tu rban c er eg im e and nu t r i en t ava i lab i l i ty ) . Th e cu r r en timp l em en t a t iono f MC 1inth eno r thw e s t Un i t ed S t a t e si sona3 0 a r c s e condg r id , wh i cht r an s l a t e sto app ro x im a t e l y8 0 0 -mg r idc e l l s(Ro g e r se ta l .2 0 1 1 ) .A po t en t i a lv e g e t a t ion m ap , con s t r a in ed b ylon g t e rm b io g eo g r aph i candh yd ro lo g i ca v e r a g e stoa vo idt r an s i en tanom a l i e s ,in i t i a l i z e sv e g e t a t ionco v e rin MC 1 .A sp in -up ph a s ew i th d e t r end ed h i s to r i cc l im a t ed a t a in i t i a l i z e sc a rbonpoo l sund e rav a r i e t yo ffi r er e g im e s . MC 1th enrun sth rou gh a 1 0 0 y e a rh i s to r i c a lp e r iod w i th ob s e r v ed c l im a t ed a t a .F in a l l y , MC 1p ro v id e s p ro j e c t ion so fb io g eo ch em i c a lc y c l in g and v e g e t a t ion d yn am i c sfo re a chp i x e l(g r idc e l l )inth el and s c ap eona mon th l yt im es t epinth efu tu r eb a s edupondown s c a l ed ou tpu tf romg en e r a lc i r cu l a t ion mod e l s . Th efi r esub mod e lw i th in MC 1(L en ih ane ta l .1 9 9 8 )d i s t r ibu t e sth e c a rbonpoo l sin tofu e lc a t e go r i e s ,c a l cu l a t e sth e mo i s tu r e con t en to fth e s efu e l s ,andth enr emo v e sc a rbonf romth e app rop r i a t e poo l s on ac e l l -b y c e l lb a s i sa f t e ra fi r e . MC 1 ’ sp ro j e c t iono fpo t en t i a lv e g e t a t iont yp e s(PVT )i s b a s ed on b ro ad ph y s io gnom i ct yp e s( e . g . ,t emp e r a t e m a r i t im ee v e r g r e en n e ed l e l e a ffo r e s t ) , wh i ch w ew e r e ab l etoin t e rp r e tint e rm so f commun i t yt yp e s and dom in an tt r e esp e c i e sa l r e ad yinou rs tud ya r e a .W eu s ed th e s ep ro j e c t ion so fPVTtocon s t r a inth eSTSMtotho s e sp e c i e s and commun i ty typ e s tha t m igh tb e com e dom in an tlo c a l l yund e rc l im a t ech an g e . W ea l sou s ed co r r e l a t ion sb e tw e en MC 1ou tpu tandS Itod yn am i c a l l y ad ju s tS Iannu a l l y ,thu sa l low in gc l im a t e -d r i v ench an g e s 1 3h t tp : / /www . f s l .o r s t . edu /dgvm / Janua ry2015 S IMULATED CL IMATEIMPACTS ON VEGETAT ION 2 2 9 FIG.1 . (A )S ch em a t i cd i a g r amo fc l im a t e s en s i t i v ev e g e t a t ions t a t e and t r an s i t ions imu l a t ion mod e l(CV -STSM )coup l edw i th MC1 , Fo r e s tV eg e t a t ion S imu l a to r(FVS ) ,and En v i s ion .(B ) Th ero l eo fth ecoup l edv e g e t a t ion mod e l in gf rom p an e l(A ) ( con ta in edw i th inth epu rp l ebo x )w i th inth el a r g e rl and -u s ed e c i s ion mod e l . Abb r e v i a t ion sa r ePVT ,po t en t i a lv e g e t a t iont yp e ;S I , s i t eind ex ;G IS ,g eo g r aph i cin fo rm a t ions y s t em .FVS , MC 1 ,andEn v i s iona r ee x i s t in gcompu t e r mod e l s .Th ea r row sshowd a t a mov ingf romon e modu l etoano th e r ,w i th inEn v i s ion modu l e sgo v e rn in gl andu s eandl andco v e rt yp e sth a tund e r goe co lo g i c a l su c c e s s ion(F ig .1A )and w i th ina l lEn v i s ion modu l e s(F i g .1B ) . insu c c e s s iona lra t e sfo r ea ch Env i s ionIDU . Wh i l e STSM sa r eg en e ra l lyu s edfo rnon chang ingc l ima t e s ,b y coup l ingt ran s i t ionp robab i l i t i e sandanexpand edr an g e o fpo s s ib l es ta t e stoth edynam i c so fac l ima t e s en s i t i v e DGVM ,w ecomb in edth eu t i l i t i e so f bo thtyp e so f t e chno logy . D e s ignsumma ry.—Ou r mod e l(CV -STSM )in t e g r a t e s c l ima t e -d r iv en chang e sint r e eg row th po t en t ia l and b road p lan t phy s iognom i cg roup sf rom a DGVM (MC1 ) w i th a mod e lo ft r e eg row th ra t e s and su c c e s s iona lt ra j e c to r i e sfo rr eg iona lp lan tcommun i t y typ e s(FVS )th roughas ta t e -and t ran s i t ionf ram ewo rk (VDDT )toc r e a t ev e g e t a t iont r an s i t ion p rob ab i l i t i e s th a ta r efun c t ion so ft im e ,S I , and PVT . CV -STSM a l low sfo rfin e rd e s c r ip t iono flo c a lp l an tcommun i t i e s th an DGVM s ,u s e scu r r en tv e g e t a t iona sth es t a r t in g po in tfo rfu tu r ep ro j e c t ion s ,u s e sl a r g elo c a ld a t as e t sfo r p a r am e t e r i z a t iono ft r an s i t ion s ,a l low sfo rth ein co rpo r a t ion o f sp e c ifi edt yp e so fl and -u s ed e c i s ion s , and a ch i e v e sth i sa tafin esp a t i a lg r a inth a ti sapp rop r i a t efo r in fo rm in glo c a lm an a g em en td e c i s ion s(F i g .1 ) .T r an s i t ion sw i th in CV -STSM w e r et r a in ed b y FVS u s in g e x i s t in gr e g ion a ld a t a .W i thsp a c e -andt im e -fi l l in gm ap s o f MC 1ou tpu tfo rp ro j e c t edPVT sandS I , CV -STSM 2 30 GABR IELI . YOSP INET AL . c an mod i fy andcon s t ra int ran s i t ion stoin co rpo r a t e spa t ia l ly andt empo ra l ly exp l i c i te f f e c t so fc l ima t e chang eonsu c c e s s iona lt ra j e c to r i e s . Inth i spap e r ,CV -STSMu s e sEnv i s ionso l e lya sa G IS f ram ewo rkto p rov id ec l ima t e s en s i t iv espa t ia linpu t d a ta . How ev e r ,i fth efu l lcapab i l i t i e so f Env i s iona r e u s ed ,s imu la t ion so fv eg e ta t ionchang einCV -STSMc an b ecoup l edto m e chan i s t i cs imu la t ion so fw i ld landfi r e b ehav io r ,o th e re co log i ca ld i s tu rban c ep ro c e s s e s ,andto a g en t -ba s edhumand e c i s ion mod e l ing(F ig .1B ) . S tudya r ea Ou rs tud ya r e ai slo c a t edinth esou th e rn W i l l am e t t e tudya r e ai s V a l l ey ,O r egon , USA(F i g .2 ) .Th e8 20 -km2s bound edbyth e Eu g en e -Sp r in gfi e ld m e t ropo l i tana r e a ’ s u rbang row th bound a ry(popu la t ion2 560 0 0 )andth e ed g e so fth e W i l l am e t t e Va l l eye co r e g ion(Hu l s ee ta l . 2 0 0 2 ) .I ten compa s s e sth r e ein co rpo r a t edtown sran g in g f rom 1000–8000 p eop l e ea ch ,a s w e l la s ex t en s iv e w i ld land–u rban in t e r fa c e . Th es tudy a r ea in c lud e s app rox im a t e l y1 650 0ta x lo tpa r c e l sd iv id edin toapp ro x im a t e ly890 00IDU s ;th em ax imum m app ingun i ti s5h a andth e ma jo r i tyo fIDU sa r e1 hao rl e s s .E l e va t ion r ang e sf rom1 15 month eW i l l am e t t eVa l l eyfloo rto6 3 0 minth eCa s c ad e Moun t a infoo th i l l s .Ex tan tv eg e t a t ioni s d i v e r s e andin c lud e sp r a i r i e ,sa vann a , wood land and fo r e s t ,a sw e l la sag r i cu l tu ra lland s .Th edom in an tcon i f e r fo r e s ttyp e ,bo thnowandinth ela t e19 thc en tu r y ,i s Doug la s -fi r fo r e s t .P lan t commun i t i e s tha t con ta in O r e gonwh i t eo ak(Qu e r cu sga r r ya naDou g la sex Hook . ) a r e pa r t i cu la r l yv a lu edinth e Pa c ifi c No r thw e s t , and con s e r va t ionandr e s to r a t iono fop en O r egon wh i t eo ak h ab i ta t si sem e rg in ga sacon s e rv a t ionp r io r i ty(U l r i ch 2 0 1 0 , M i cha lak20 11 ) .A c co rd ing ly ,w etookex t en s i v e e f fo r t stoa c cu ra t e ly mapoakcommun i t i e sinth ecu r r en t l and s c ap eandto mod e lth e i rsu c c e s s ion a lt r a j e c to r i e s . Wh enw ep e r fo rm eds imu la t ion sfo rth efu tu r ep e r iod , w ed idsoon lyfo ra r ea stha thad‘ ‘na tu ra l ’ ’v eg e ta t iona t th eb eg inn ing o fth es imu la t ion(2007 ) . Many o fth e a r ea stha tw e r eth eh igh e s t -qua l i tyoakhab i ta tp r io rto Eu ro -Am e r i can s e t t l em en t hav eb e en conv e r t edto a g r i cu l tu ra lu s e so ru rban i z ed ,anda r eth e r e fo r e no t in c lud edinanyfu tu r es imu la t ion s . Mod e lpa ram e t e r i za t ion S ta t e -and t ran s i t ions imu la t ion mod e l.—W ec r e a t eda cu s tom i z edSTSMtod e s c r ib ebo thcu r r en tandpo t en t i a l fu tu r ev eg e t a t iona tal e v e lo fd e ta i lth a t wou lda l lowu s tos imu la t eth esu c c e s s ion a lt r a j e c to r i e so fp l an tcommu n i t i e s w i th in th es tudy a r ea . W ec la s s ifi ed sp e c i e s a s s emb l ag e sin toe igh te co lo g i c a l lyr e la t edco v e rt yp e s d efin ed by dom in an t and subdom in an tt r e e sp e c i e s , r e ly in g on p r e v iou sfi e ldwo rk(D ay20 05 , Sonn enb l i ck 2 0 0 6 , Mu rph y2 00 8 )andknow l edg eo fth e s ecommun i t i e s .Ba s edonth ep ro j e c t ion so fpo t en t i a lv e g e ta t ionf rom p r ev iou s wo rk w i th MC 1 ,w eadd edfou rco v e rtyp e sto th eSTSMtor ep r e s en tfu tu r ePVT sno tp r e s en tinth e con t empo ra ryland s cap e :(1 ) pond e ro sa p in e( P i n u s E co log i ca l App l i ca t ion s Vo l .25 , No .1 p o n d e r o s aL aw sonandC .L aw son )s a v ann a ,( 2 )pond e r o s ap in e wood l and ,( 3 )P a c ifi c m ad ron e (A r b u t u s m e n z i e s i i Pu r sh ) wood l andandfo r e s t ,and( 4 )P a c ifi c m ad ron e and Dou g l a s -fi rfo r e s t . Th efou rn ewco v e r t yp e s con t a int r e e sp e c i e sth a ta r ep r e s en t bu t no t dom in an tinth ecu r r en tl and s c ap e(T ab l e1 ) .N ewsp e c i e s cou ld m i g r a t ein toth es tud ya r e a(o re s c ap ef rom ho r t i cu l tu r a lp l an t in g s )tofo rmo th e rco v e rt yp e s ,bu t t r e e sp e c i e sth a t cou ld r ep r e s en tfu tu r e MC 1 PVT s a l r e ad ye x i s tinth el and s c ap e . W eth e r e fo r ea s sum ed th a tth eimm i g r a t ionandem e r g in gdom in an c eo fn ew t r e esp e c i e sw a s no tn e c e s s a r ytos imu l a t e du r in gth e r e l a t i v e l ysho r t( 9 3y e a r )t im ef r am eo fou rs imu l a t ion s . W ed efin ed1 1 1d i s c r e t es t a t e sin1 2co v e rt yp e s ,and l ink ed e a ch cov e r typ e to co r r e spond in g po t en t ia l v e g e t a t iont yp e sf rom MC 1(T ab l e1 ) . Tod efin es t a t e s , w eu s edfou rp a r am e t e r s :dom in an tt r e esp e c i e s( th eco v e r t yp e ) ,qu ad r a t i cm e ans t emd i am e t e r(fi v ec l a s s e s ) ,c anop y c lo su r e( th r e el e v e l s ) ,andc anop yl a y e r in g(on eo rtwo l a y e r s ) .Qu ad r a t i cm e and i am e t e ri saw e i gh t ed m e anth a t emph a s i z e sl a r g e rt r e e sinas t and .Toa s s i gnin i t i a ls t a t e s toth el and s c ap e ,w eco l l e c t edd e s c r ip t ion so fv e g e t a t i v e co v e rf romfi v ee x i s t in gd a t asou r c e sandu s edth emto g en e r a t e th e fou rp a ram e t e r sn e ed ed to a s s i gn a v e g e t a t ions t a t etoe a chIDU .W ee sp e c i a l l ys c ru t in i z ed th e s ed a t as e t sto d e s c r ib ep r a i r i e and o aks a v ann a h ab i t a t s , wh i chcu r r en t l yh a v el im i t edd i s t r ibu t ion s . T ran s i t ion p robab i l i tyin i t ia l i za t ion.—To g en e ra t e t r an s i t ionp rob ab i l i t i e sfo rou rSTSM ,w eapp l i edth e r a t e so ft r e eg row thandsu c c e s s ion a lch an g e sp ro j e c t ed b ya n ew l yr e v i s ed v e r s ion o fth eP a c ifi c No r thw e s t v a r i an to f FVS(Gou ld e ta l .2 0 1 1 ) . Th er e v i s ion s in co rpo r a t e mod ifi c a t ion stoth eh e i gh t ,g row thr a t e , comp e t i t i v ed yn am i c s ,and mo r t a l i t yo fO r e gon wh i t e o akth a tw e r ea s s e s s eda sp a r to fou rl a r g e rr e s e a r ch e f fo r t .W er anFVSu s in g mu l t ip l et r e el i s t stoin i t i a l i z e andt r a inth et r an s i t ionp rob ab i l i t i e sinou rSTSM .T r e e l i s t sc am ef romo v e r2 0 0 0p lo t sf roms e v e r a ld a t as e t sin sou th e rn and w e s t e rn O r e gon ,p r in c ip a l l yf romth e Fo r e s tIn v en to r yand An a l y s i sd a t ab a s e(Woud enb e r g 1 4 Th et r e el i s t sw e r eb inn ed e ta l .2 0 1 0 ;a v a i l a b l eo n l i n e) . in to STSM s ta t e s ba s ed on th e fou r pa ram e t e r s d e s c r ib edabo v e .P lo td a t af rom w e s t e rn O r e gon(W i l l am e t t eV a l l e ytosou thw e s t e rn O r e gon )p ro v id edsu ffi c i en tr ep l i c a t e so fe a chcu r r en t andfu tu r es t a t e . To s imu l a t et r e er e g en e r a t ion ,w eu s eda v e r a g edd a t af rom o v e r1 0 0 0p lo t sth a tin c lud eds e ed l in gd a t a . FVSrun s w e r ep e r fo rm edw i thandw i thou tt r e er e g en e r a t ion .W e r ane a cho fth e s et r e el i s t sfo r1 0 0y e a r sa taw id eenou gh r ang eo fS Iv a lu e sto d e s c r ib e cu r r en t andfu tu r e l and s c ap e s ,andth enr e -b inn edth eou tpu tt r e el i s t sin to STSMs t a t e s . Ou ru s eo f mu l t ip l et r e el i s t sfo re a chs t a t e r e su l t edin m an y po s s ib l esu c c e s s ion a lt r a j e c to r i e sin FVS ,f rom wh i ch w ec a l cu l a t edth ev a lu e so fannu a l t r an s i t ionp rob ab i l i t i e s . 1 4h t tp : / /www .fia . f s . f ed .u s / Janua ry2015 S IMULATED CL IMATEIMPACTS ON VEGETAT ION 2 3 1 FIG.2 . Sa t e l l i t eim a g e r yo fth es tud ya r e alo c a t ioninth eW i l l am e t t eV a l l e y ,O r e gon , USA .Th er edr e c t an g l er ep r e s en t sth e 0 2 . 6 90 N , bound ing boxfo rth e MC 1s imu l a t ion s . Th eb lu el in esu r round sth es tud ya r e a . Sou r c e : Goo g l eE a r th ;4 38 5 902 0 .260 W .Im a g em ad eon1 Au gu s t2 0 1 1 . 122 8 53005 T ran s i t ionp robab i l i tyad ju s tm en t sandcon s t ra in t s.— 1 .MC1cu s tom i za t ion—A ma jo rgoa lo fou rp ro j e c t wa stod ev e lopa wa ytob e g inou rs imu la t ion sonth e p r e s en tland s c ap ew i thav e r s iono f MC1th a t ma t ch ed ob s e rv ed h i s to r i c a lv eg e ta t ion , ra th e rth an p ro v id in g e s t im a t e so fpo t en t ia ln a tu r a lv e g e ta t ion . Do ingsowou ld a vo idund e s i rab l esudd enchang e sb e tw e enth eh i s to r i c a l fu tu r es imu l a t ionp e r iod s(Van Vuu r ene ta l .20 1 1 ) .In p r ev iou ss imu la t ion sw i th MC1(Ro g e r se ta l .20 1 1 ) ,th e h i s to r i c a lp e r iod(1 8 95 –2 00 6 )y i e ld edat emp e ra t em a r i t im ee v e rg r e en n e ed l e l e a ffo r e s t(wh i ch w eequ a t eto Dou g la s -fi rfo r e s tinou rs tud ydom a in ) ,in s t e ado fth e p r a i r i eandsa vann ahab i t a t sth a te x i s t edw i th inth es tud y a r e ainth em id to l a t e1 9 thc en tu r y(H ab e ck1 9 6 1 ) .I ti s l ik e l yth a tth eem e r g en tfi r eb eh a v io rr e g im ein MC 1 d r a s t i c a l l yund e r e s t im a t edh i s to r i c a lfi r ef r equ en c y ,wh i ch w a sinflu en c edb yr e cu r r in gbu rn in gb yind i g enou sp eop l e (Ch r i s t yand A l v e r son2 0 1 1 ) .Toe xp lo r eth econ s equ en c e so fth i s und e r e s t im a t ion ,w e bu i l tn ew ad ju s t ab l e p a r am e t e r sin to MC 1th a ta l low edu stosp e c i f yth efi r e r e tu rnin t e r v a l andth e bu rn d a t e du r in gth esp in -up ph a s e . W eth ene x am in ed MC 1ou tpu tv a r i ab l e su s in g fi r er e tu rnin t e r v a l so f3 ,5 ,1 0 ,1 5 ,and2 0y e a r s ,f romth e 1 5 0 thtoth e3 0 0 thd a yo fth ey e a r ,b ys t ep so f2 5d a y s ( app rop r i a t efo rth efi r es e a sono fth er e g ion ’ sM ed i t e r r an e anc l im a t e )du r in gth esp in -upph a s e . TABLE 1 . S ta t e -and t r an s i t ions imu l a t ion mod e l(STSM )t r e eco v e rt yp e sw i thdom in an tanda s so c i a t edlo c a lsp e c i e s . STSMcov e rt yp e Oaksavanna Oak wood land Oakand Doug la s -fi r wood l and Doug la s -fi randoak wood l and Doug la s -fi rfo r e s t Doug la s -fi rand map l efo r e s t Doug la s -fi randg randfi rfo r e s t B ig l ea f map l efo r e s t P in esavanna P in e wood land Mad ron e wood landandfo r e s t Mad ron eand Doug l a s -fi rfo r e s t Dom in an tsp e c i e s d e s c r ip t ion Dom in an tsp e c i e s d rou gh t to l e r an tb ro ad l e a f d e c iduou s d rou gh t to l e r an tb ro ad l e a f d e c iduou s d rou gh t to l e r an tb ro ad l e a f d e c iduou sandn e ed l e l e a f e v e r g r e en d rou gh t to l e r an tb ro ad l e a f d e c iduou sandn e ed l e l e a f e v e r g r e en l e s sm e s i cn e ed l e l e a f e v e r g r e en m e s i cn e ed l e l e a fe v e r g r e en andb ro ad l e a fd e c iduou s mo r em e s i cn e ed l e l e a f e v e r g r e en m e s i cb ro ad l e a fd e c iduou s Q u e r c u sg a r r y a n a x e r i ce v e r g r e enn e ed l e l e a f x e r i ce v e r g r e enn e ed l e l e a f e v e r g r e enb ro ad l e a f e v e r g r e enb ro ad l e a fand n e ed l e l e a f P i n u sp o n d e r o s a P i n u sp o n d e r o s a A r b u t u sm e n z i e s i i A r b u t u sm e n z i e s i i, P s e u d o t s u g am e n z i e s i i A s so c i a t edsp e c i e s Q u e r c u sk e l l o g g i i Q u e r c u sg a r r y a n a Q u e r c u sg a r r y a n a, P s e u d o t s u g am e n z i e s i i P s e u d o t s u g am e n z i e s i i, Q u e r c u sg a r r y an a P s e u d o t s u g am e n z i e s i i P s e u d o t s u g am e n z i e s i i,A c e r m a c r o p h y l l um P s e u d o t s u g am e n z i e s i i, A b i e sg r a n d i s A c e rm a c r o p h y l l um C a l o c e d r u sd e c u r r e n s,P i n u s p o n d e r o s a T h u j ap l i c a t a,T s u g a h e t e r o p h y l l a A l n u sr u b r aa n dA . r h om b i f o l i a ,F r ax i n u s l a t i f o l i a ,P o p u l u s b a l s am i f e r a 2 32 GABR IELI . YOSP INET AL . Manycomb ina t ion so ffi r er e tu rnin t e rva landbu rn d ayc r ea t edv eg e ta t ioncond i t ion stha tw e r es im i la rto ob s e rv edv eg e ta t ioninth es tudya r ea p r io rto Eu ro Am e r i cans e t t l em en t . W echo s eto u s ea10 -y ea rfi r e r e tu rnin t e rva l ,bu rn ingonday197 ,du r ingth esp in -up pha s e .W eth ens imu la t edth eh i s to r i ca lp e r iod w i thfi r e d i sab l edin MC1to m im i cbo thth elo s so find ig enou s bu rn inganda c t iv efi r esupp r e s s iontha to c cu r r edinth e s tudya r ea .On lyaf ewy ea r sa f t e rr emov ingfi r ef romth e s y s t em ,v eg e ta t ioninth e MC1 s imu la t eds tudy a r e a qu i ck ly app roa ch ed va lu e sa s so c ia t ed w i th a d en s e Doug la s -fi rfo r e s t , ma t ch ingob s e rva t ion so fth ed i r e c t ion so f su c c e s s iona l chang e ,a lb e i t w i th chang e s o c cu r r ing mo r erap id lyinth e mod e lthaninr ea l i ty . W etu rn edo f fth efi r e mod e lin MC1tos imu la t eth e fu tu r ep e r iod ,ex c ep twh enw ewan t edtoexp lo r eth efu l l r ang eo f MC1 ou tpu t s . W ed idso(1 )to d i s t ingu i sh d i r e c tc l ima t ee f f e c t s on v eg e ta t ionf romin t e ra c t i v e e f f e c t sw i thd i s tu rban c eand(2 )toa l lowth ein co rpo r a t ion o fa d i f f e r en tm e chan i s t i cfi r e mod e l ,F lamM ap (F inn ey2006 ) ,in Env i s ion(G .I . Yo sp in ,unpub l i s h e d 1 5 d a ta;F lamMapa va i lab l eon l in e) . 2 .MC1fu tu r ep ro j e c t ion s.—W ee xp lo r ed MC1 ’ sd y n am i c sund e rth r e eg en e ra lc i r cu la t ion mod e l s(GCM s ) , H ad l ey(M e tO ffi c e Had l eyC en t r efo rC l im a t eP r ed i c t ion and R e s e a r ch ,D e von , UK[ John se ta l .2 00 3 ] ) ,M IROC (mod e lfo rin t e rd i s c ip l in a ryr e s e a r chonc l ima t e ;C en t e r fo rC l im a t eS y s t emR e s e a r ch , Un i v e r s i t yo fTokyo ,J ap an [H a sum iandEmo r i2 00 4 ] ) ,andCS IRO(Commonw e a l th S c i en t ifi candIndu s t r i a lR e s e a r ch O r gan i sa t ion ,C l a y ton Sou th , Au s t ra l i a[Go rdone ta l .2 00 2 ] ) ,a l lrunund e rth e A 2em i s s ion ss c ena r io(N ak ic enov i ce ta l .20 0 0 ) ,b e c au s e i ti sun l ik e l yth a thum anem i s s ion sw i l lb el e s sth anth i s s c en a r io(Raup a che ta l .20 07 ) . Th eland -u s ech an g e s inh e r en tinth e s es c en a r io sa r ea tp r e s en tth eon lyl and u s ech an g e se xp l i c i t lyr ep r e s en t edinth e CV -STSM . To e xp lo r eth ee f f e c to f CO e r t i l i z a t ionin MC 1onfu tu r e 2f v e g e ta t ion d yn am i c s ,w e ex am in eds i xfu tu r ec l im a t e e r t i l i z a t ion s c en a r io s ,th r e e GCM sc ro s s edw i thtwoCO 2f p a ram e t e r i z a t ion s . An a ly s i so fth eou tpu tund e rv a r y in g e r t i l i z a t ions c en a r io sind i ca t edth a t ,fo rou rs tud y CO2f a r ea , MC1 wa sin s en s i t iv e to chang ing v eg e ta t ion e r t i l i z a t ion( s e e App end ix C ) . Thu s , s en s i t iv i t yto CO 2f d e sp i t efind in g sshow in gth eimpo r t an c eo fCO2f e r t i l i z a t ionin m an yr e g ion s(No rbye ta l .2 00 5 ) ,fu r th e ran a l y s e s inth i sm anu s c r ip tcon s id e ron lyth eth r e e GCM su s in g th e A2 em i s s ion ss c en a r io s and mod e r a t ev eg e t a t ion . s en s i t iv i t ytoa tmo sph e r i cCO 2 MC1 ou tpu tshow ed mod e s tt r end s ov e rt im ein v a r iab l e sa s so c ia t ed w i thp rodu c t iv i ty . Ov e r93y ea r so f s imu la t iont im e ,ca rbonpoo l sg en e ra l lychang edbyon l y 5 –10 %. In con t ra s t , MC1show edla rg e chang e sin po t en t ia lv eg e ta t iontyp e s .A ts imu la t iony ea r0(2 0 0 7 AD ) ,th es tudy a r ea wa sa m ix o fth r e e PVT s . Th e dom inan tPVT(;85 %o fth eland s cap e ) wa st emp e r a t e 1 5h t tp : / /www .fi r e lab .o rg /p ro j e c t /flammap E co log i ca l App l i ca t ion s Vo l .25 , No .1 m a r i t im ee v e r g r e en n e ed l e l e a ffo r e s tinth e bound in g r e c t an g l ea roundth es tud ya r e a , wh i ch w ein t e rp r e ta s r ep r e s en t in g Dou g l a s -fi rfo r e s t(T ab l e1 ) . Abou t1 5 %o f th ea r e ab e g aninth esub t rop i c a lm i x edb ro ad l e a fand n e ed l e l e a fe v e r g r e enfo r e s t , wh i chc anb ein t e rp r e t eda s r ep r e s en t in gm i x ed Dou g l a s -fi r and o ak o rm ad ron e fo r e s t . Th e r ew e r ea l sos i xg r idc e l l s( ;0 . 2% o fth e r a s s l and . l and s c ap e )th a tw e r ep ro j e c t edto b eC 3 g r a s s l andfo ra l l A c co rd in gto MC 1 ,th e s er em a in ed C3g c l im a t es c en a r io sa ta l lt im epo in t s , mo s tl ik e l ydu eto th e i rsh a l lowso i l s . Th et im etor e a chth efin a lPVTin MC 1d ep end edon th e GCM . A l ls imu l a t ion s show ed som ed e g r e eo f sw i t ch in gb e tw e enth esub t rop i c a lm i x edb ro ad l e a fand th e ma r i t im e ev e rg r e en n e ed l e l ea f fo r e s t po t en t ia l v e g e t a t iont yp e s . Wh en u s in gth eH ad l e y mod e l ,th e land s cap ea l soin c lud ed th e con t in en ta ln e ed l e l ea f e v e r g r e enfo r e s t po t en t i a lv e g e t a t iont yp e( s im i l a rto in t e r io r pond e ro sa p in e fo r e s t s / savanna s )a c ro s sa sub s t an t i a la r e a , mo s t l yb e tw e ens imu l a t ion y e a r s3 0 and 50 . A l ls imu la t ion s ag r e ed on th eu l t ima t e dom in an c eo fsub t rop i c a lm i x edb ro ad l e a fandn e ed l e l e a fe v e r g r e enfo r e s tPVT ,wh i chw a se s s en t i a l l yth eon l y PVTp r e s en tb yth eendo fth es imu l a t ionp e r iodin2 0 9 9 . Th er ap idandd yn am i csh i f tb e tw e env e g e t a t iont yp e s o v e rth ecou r s eo fth es imu l a t ion ss t em sf romth es tud y a r e alo c a t ion ,n e a rth econflu en c eo fth eth r e eb io c l i m a t i czon e s(m a r i t im et emp e r a t e ,con t in en t a lt emp e r a t e , andsub t rop i c a l ; Ku ch l e r1 9 6 4 )andf romth es en s i t i v i t y o f MC 1top ro j e c t edc l im a t ech an g e sinth es tud ya r e a . W i thfi r etu rn edon , MC 1s imu l a t edth r e esp a t i a l l y l a r g e ,low in t en s i t yfi r e sn e a rth eendo fth es imu l a t ion p e r iod( 2 0 7 7 – 2 0 9 9 )fo ra l lc l im a t es c en a r io s .Th e s efi r e s d idno ta l t e r MC 1 ’ sp ro j e c t ion so fPVT ,andh adon l y m ino re f f e c t son MC 1ou tpu tv a r i ab l e s . Th e s efind in g s ind i c a t eth a ttu rn in go f fth efi r e mod e lin MC 1h adon l y am ino re f f e c tonp ro j e c t ion so f MC 1ou tpu tv a r i ab l e s . B e c au s ew etu rn edo f fth efi r e mod e lin MC 1 ,how e v e r , ou rr epo r t ed r e su l t s w i th MC1 w i l ld i sa g r e e w i th p r e v iou sr e s e a r chu s in g MC 1fo rr e g ion sth a tin c lud e ou rs tud ya r e a( e . g . , Ro g e r se ta l .2 0 1 1 ) . 3 .T r a n s i t i o np r o b a b i l i t ya d j u s tm e n t s.—MC 1 ou tpu t do e s no tin c lud eS I , wh i chi sn e ed ed b y FVS , bu ti t in c lud e s num e rou s ou tpu t sr e l a t edtov e g e t a t ion p ro du c t i v i t y ,so i l s , and c l im a t e . Tor e l a t e MC 1 ou tpu t v a r i ab l e sto S Iv a lu e s ,w eco r r e l a t ed a v e r a g ed MC 1 ou tpu tf rom1 9 8 2 – 2 0 0 6w i tha v a i l ab l eS Id a t a(Gou lde t a l .2 0 1 1 ) .W ep e r fo rm edth i sco r r e l a t ionfo r1 7 9 0 MC 1 c e l l s ,r an g in gf romc en t r a ltosou th e rn O r e gon ,inth e Coa s t Rang e and va l l ey s . Th i sg eog raph i c cho i c e b r a ck e t sth er an g eo fe xp e c t ed S Iinth es tud ya r e a f romth ep r e s en tun t i l2 0 9 9 ,b a s edonth ep r ed i c t ionth a t fu tu r ec l im a t einth e W i l l am e t t eV a l l e ym a yr e s emb l e cu r r en tc l im a t einsou thw e s t e rn O r e gon(Ro g e r se ta l . 2 0 1 1 ) . W eu s ed Ak a ik e ’ sin fo rm a t ionc r i t e r ion(A IC ; Ak a ik e1 9 7 4 )tos e l e c ta fin a l mod e lw i than o v e r a l l 2 ¼0 . 5 5(T ab l e2 )top rodu c esp a c e -andt im e ad ju s t edr fi l l in gm ap so fS Ifo rou rs tud ya r e a . Janua ry2015 S IMULATED CL IMATEIMPACTS ON VEGETAT ION 2 3 3 TABLE 2 . Va r iab l e su s edinth er e g r e s s ionequ a t ionr e l a t in g f o rth et r an s i t ion sth a tw e r ed i s a l low edsoth a tth esumo f MC1va r iab l e stos i t eind e x . a l low edp rob ab i l i t i e sw a sa lw a y sun i t y .A sPVT sch an g e Va r iab l e Co e ffi c i en t S t and a rd i z ed co e ffi c i en t To ta lso i lca rbon 9 . 0 8 13 1 04 Fo r e s tn e tp r ima ryp rodu c t i v i t y 1 . 6 9 93 1 02 Av e rag eJun et emp e r a tu r e 2 . 1 5 8 Abov eg roundl iv efo r e s tc a rbon 1 . 9 6 23 1 04 L ea fshap eind ex 0 . 1 9 8 9 In t e r c ep t 7 5 . 6 0 . 4 8 2 0 . 2 2 9 0 . 1 8 3 0 . 1 2 0 0 . 0 5 5 1 L ea fshap eind e xr an g e scon t inuou s l yf rom0to1 ,wh e r e0 co r r e spond sto n e ed l e sh ap edl e a v e s and 1 co r r e spond sto b roadl eav e s . Th esp a t i a lg r a info r MC 1(app ro x im a t e ly80 0 -mg r id c e l l s )i s mu chla rg e rth anth eIDU s ,andthu sth e MC 1 p ro j e c t ed v a lu e sfo rS In e ed edto b e down s ca l edto ind i v idua lIDU s .Todoth i s ,w ead ju s t edth efu tu r eS Io f e a chIDU(S I )p ropo r t ion a l lyov e rt im e ,ba s edonth a t IDU t ) ,th e MC 1c e l l ’ s in i t ia lS I(S I , IDU ’ s in i t ia lS I(S I IDU 0 MC 1 0) andth e MC 1c e l l ’ sp ro j e c t edfu tu r eS I(S I )a tt im et MC 1t IIDU0 S IIDUt ¼S S IMC1t : S IMC10 4 .T ra n s i t i o np r o b a b i l i t yc o n s t ra i n t s.—S in c eth eSTSM con ta in sa l lv e g e ta t iontyp e sandt r an s i t ion sn e ed edfo r mu l t ip l efu tu r ec l im a t es c ena r io s ,a sw e l la sth ep r e s en t c l im a t e ,w el im i t edth epo s s ib l et r an s i t ion sa sfo l low s :( 1 ) w ed e t e rm in ed wh i chco v e rtyp e sanda s so c i a t eds t a t e s andsp e c i e s wou ldb ecomp a t ib l ew i the a ch MC 1 PVT and(2 )w econ s t ra in edth eSTSMtoa l lowt r an s i t ion s on lytocompa t ib l es t a t e s(Tab l e3 ) .Fo rex amp l e ,und e r th esub t rop i c a lm ix edb road l ea fandn e ed l e l e a fev e r g r e en fo r e s tPVT ,not r an s i t ion stop in esa vann ao r wood l and a r ea l low ed ,b e cau s e MC 1wou ldno tin f e rth eo c cu r r en c e o fav eg e t a t iontyp es im i la rtopond e ro sap in esa v ann ao r wood l andund e rth i sPVT ;fo rth esam er e a son ,e x i s t in g p in e savanna o r wood land s ta t e s can on ly r em a in un ch ang ed ,o rt r an s i t ionto o th e rs t a t e sv ia a l low ed t r an s i t ion s .W i th ine a chPVT ,t r an s i t ionp rob ab i l i t i e sfo r e a chs t a t ew e r ep ropo r t iona l l yad ju s t edtocomp en s a t e inth efu tu r e ,w ep e rm i ta l le x i s t in gs t a t e stop e r s i s tinth e l and s c ap e un t i l ch an g ed b y su c c e s s ion o r as t and r ep l a c in gd i s tu rb an c e .I ti sc l e a rth a tc l im a t ech an g eh a s in c r e a s edr a t e so ft r e e mo r t a l i t yinsom elo c a t ion s(A l l en e ta l .2 0 1 0 ) . MC 1ou tpu t ,how e v e r ,show ednoe v id en c e o fl a r g e s c a l et r e e mo r t a l i t y( e . g . ,l a r g efu tu r elo s s e so f t r e ec a rbondu etod rou gh t ) .B e c au s eind i v idu a lt r e e sa r e lon g l i v edandc ana c c l im a t eton ewcond i t ion s ,th e yc an su r v i v efo rm an yy e a r sinsubop t im a lg row thcond i t ion s , l e ad in gtot im el a g sandnon l in e a rr e spon s e stod rou gh t . Fo l low in gas t and r ep l a c in gd i s tu rb an c e ,how e v e r ,on l y t r an s i t ion sa l low edund e rth ecu r r en tPVT m a yo c cu r .I f th edom in an tt r e esp e c i e sinth ep r e -d i s tu rb an c es t a t ei s comp a t ib l ew i thth ecu r r en tPVT(T ab l e3 )andi sc ap ab l e o fr e sp rou t in gfo l low in gd i s tu rb an c e( i . e . ,o ak s ,b i g l e a f m ap l e ,and m ad ron e ) ,th enth eIDU w i l lr e g en e r a t ea sa youn gt r e es t a t eo fth eco v e rt yp eco r r e spond in gtoth a t sp e c i e s .I fth ep r e -d i s tu rb an c es t a t ed idno tcon t a inan y comp a t ib l esp e c i e sth a tr e sp rou tfo l low in gd i s tu rb an c e , th enth eIDUr e g en e r a t e sa sanop en ,g r a s s / fo rbs t a t eo f th e dom in an tco v e rt yp efo rth a t PVT . Fo re x amp l e , w i th inth esub t rop i c a lm i x ed b ro ad l e a fand n e ed l e l e a f e v e r g r e enfo r e s tPVT ,anIDUth a tw a sm i x edo akand Dou g l a s -fi rwood l andp r e -d i s tu rb an c ew i l lr e g en e r a t ea sa youn go aks t a t e . Und e rth a ts am ePVT ,how e v e r ,anIDU th a tw a sm i x ed Dou g l a s -fi r and g r and fi rfo r e s tw i l l r e g en e r a t ea sa m ad ron eg r a s s / fo rb s t a t e andth en und e r gop rob ab i l i s t i csu c c e s s ion .W eadd r e s sth el im i t a t ion so fth i sapp ro a chinD i s c u s s i o n. MODEL BEHAVIOR AND RESULTS STSMp r o b a b i l i s t i cb e h a v i o r F i r s t ,w ep e r fo rm ed(non sp a t i a l )s imu l a t ion sou t s id e o f En v i s iontoe x am in eth ep rob ab i l i s t i cn a tu r eo f CV STSM .S t a r t in gf rome i th e rano aks a v ann as t a t eo ra Dou g l a s -fi rs t a t e ,w er anr ep e a t eds imu l a t ion sin CV STSMfo r5 0 0y e a r s ,w i th S I¼ 3 0 . 4 8 m und e rth e m a r i t im ee v e r g r e enn e ed l e l e a ffo r e s tPVT(F i g .3 ) .W e TABLE 3 . S ta t e -and t r an s i t ions imu l a t ion mod e l(STSM )t r e eco v e rt yp e sto wh i cht r an s i t ion sa r ea l low edund e re a ch MC 1 d e r iv edpo t en t ia lv e g e t a t iont yp e(PVT ) . STSMcov e rt yp e Oaksavanna Oak wood land Oakand Doug la s -fi r wood l and Doug la s -fi randoak wood l and Doug la s -fi rfo r e s t Doug la s -fi rand map l efo r e s t Doug la s -fi randg randfi rfo r e s t B ig l ea f map l efo r e s t P in esavanna P in e wood land Mad ron e wood landandfo r e s t Mad ron eand Doug l a s -fi rfo r e s t T emp e r a t em a r i t im e T emp e r a t econ t in en t a l Sub t rop i c a lm i x ed e v e r g r e enn e ed l e l e a ffo r e s t e v e r g r e enn e ed l e l e a ffo r e s t e v e r g r e enfo r e s t a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed Op en canop i edg r a s s l ands t a t e sa r eth eon l ys t a t e sa l low edfo rth i sco v e rt yp eandPVT . a l low ed a l low ed a l low ed a l low ed a l low ed r a s s l and C 3g a l low ed a l low ed a l low ed a l low ed a l low ed a l low ed 2 34 GABR IELI . YOSP INET AL . E co log i ca l App l i ca t ion s Vo l .25 , No .1 FIG.3 . Chang e sins t a t e and t r an s i t ions imu l a t ion mod e l(STSM )co v e rt yp e so v e rt im e .E a chp an e lshow s1 0 0p rob ab i l i s t i c s imu la t ion srunfo r5 0 0y e a r s ,e a chf romtwod i f f e r en ts t a r t in gs t a t e s .P an e l Ab e g in sinano aks a v ann as t a t eandend sw i th sub s tan t ia lp ropo r t ion so fl a r g e -d i am e t e r ,c lo s ed c anop y , on e - andtwo c anop y l a y e r Dou g l a s -fi rs t a t e s , m ed ium -d i am e t e r Doug la s -fi r–oakwood l ands t a t e s ,and m ed ium -d i am e t e ro akwood l ands t a t e s .P an e lBb e g in sina m ed ium -d i am e t e r ,on e c anop y l ay e r Doug la s -fi rs t a t e ,andend sw i thsub s t an t i a lp ropo r t ion so fl a r g e -d i am e t e r ,c lo s ed c anop y , on e -andtwo c anop y l a y e r Doug la s -fi rs ta t e s .Co lo r edbo x e sco r r e spondtoth e1 2d i f f e r en tco v e rt yp e su s ed inth eSTSM ,e a cho fwh i chcon t a in sa l la s so c i a t ed s ta t e s ;th eh e igh to fth eco lo r edbo xco r r e spond stoth enumb e ro fs t a t e ssp e c ifi edinth eSTSM .W i th ine a chco v e rt yp e , mo v in g h igh e ronth ey -ax i sco r r e spond stoin c r e a s edv e g e t a t iond en s i t y ,e i th e rint e rm so fs t emd i am e t e r ,c anop yc lo su r e ,c anop yl a y e r in g , o racomb ina t iono fth eth r e e .D a rk e rt r a c e sind i c a t eag r e a t e rp ropo r t iono fs imu l a t ion sinap a r t i cu l a rco v e rt yp ea tap a r t i cu l a r Janua ry2015 S IMULATED CL IMATEIMPACTS ON VEGETAT ION imp l em en t edth e s es imu la t ion sinth ecompu t e rlan gu a g e R(R D ev e lopm en t Co r eT eam2008 )( s e eSupp l em en t ) . Th e pa t t e rn so f chang ein F ig .3d emon s t ra t eth e va r iab i l i tyin CV -STSM b ehav io rtha ti s du etoth e t ran s i t ionp robab i l i t i e sth em s e lv e s . Th ep r e c i s e mod ifi ca t ion so ft ran s i t ionp robab i l i t i e s ,a schang ingc l im a t e a f f e c t sS I ,a r eava i lab l einth e mod e lcod e( s e e App end i x B ) .R e su l t sw e r econ s i s t en tw i thob s e rv edsu c c e s s ion a l t ra j e c to r i e sinth er eg ion(Hab e ck1961 ,Th i l en iu s1 9 6 8 , Johann e s s ene ta l .1971 , Day2005 ) . Und e rth e ma r i t im e ev e rg r e enn e ed l e l ea ffo r e s tPVT ,a l ls imu la t ion st end ed toconv e rg eon Doug la s -fi rfo r e s ta sth efina ls ta t e .O ak savannala rg e lyt ran s i t ion edtooakwood landw i th in5 0 y ea r s ,bu t wh i l eoak wood land sd im in i sh edine x t en t , th eyw e r eab l etop e r s i s tth roughou tth es imu la t ion . Ou r fi e ldda taando th e rr e s ea r chinth i sr eg ionsugg e s tth a t su c c e s s ionf romoakwood landto Doug la s -fi rfo r e s tm a y typ i ca l ly b esom ewha tfa s t e rthans imu la t ed b yth e mod e l(Th i l en iu s1968 ,Johann e s s ene ta l .1971 ,D a y 2005 ) .Fo ra l ls ta r t ings ta t e s ,th et end en cy wa sto mo v e towa rdaf ewd i f f e r en t Doug la s -fi rfo r e s ts ta t e s ,d i f f e r en t ia t edbyt r e es i z eandcanopylay e r ing .Som esm a l l amoun to fg randfi r wa su sua l lyp r e s en tfo l low in gth e fi r s t100y ea r so fs imu la t iont im e .B ig l ea f map l eand mad ron etyp e sapp ea r edin f r equ en t lyandeph em e r a l l y . Th e mod e l show edth e capa c i tyfo rs ta t e sto bo th in c r ea s eandd e c r ea s ein m eans t ems i z e .Th e s ech an g e s inquad ra t i cm eand iam e t e rr efl e c te i th e rinfi l lw i thsm a l l t r e e s ,t r e e mo r ta l i ty ,o rind iv idua lt r e eg row th ,a s p ro j e c t edbyFVS . E f f e c t so fd i s tu rban c eandc l ima t echang e S imu la t ion sw e r ea l so condu c t ed w i th CV -STSM runn ing a s a modu l ew i th in Env i s iontoexp lo r eth e e f f e c t s andin t e ra c t ion so fc l ima t e and d i s tu rb an c e s c ena r io sa tth eland s cap es ca l e . W es imu la t edfou r c l ima t es c ena r io s(no c l im a t e chang e , Had l ey A2 , M IROC A2 , CS IRO A2 )andth r e el ev e l so fg en e r i c , s tand r ep la c ingd i s tu rban c e(nod i s tu rban c e[0 %] ,5 %,o r 17 %o fth eIDU sd i s tu rb edp e ry ea r ) .R eg iona l l y ,a l l th r e e A2c l ima t es c ena r io sind i ca t ein c r ea s ingt emp e r a tu r e s ,e sp e c ia l lyinth esumm e r .P r e c ip i ta t ioni s mo r e va r iab l e ,bu ta l ls c ena r io sind i ca t ein c r ea s ingp r e c ip i t a t ioninth ew in t e randd e c r ea s ingp r e c ip i ta t ioninth e summ e r . W i th in th e s e con s t ra in t s , CS IRO A2 i s r e la t iv e lycoo land w e t ,M IROC A2i s wa rmand w e t , and Had l ey A2i sho tandd ry(Rog e r se ta l .2011 ) .Th e d i s tu rban c el ev e l sy i e ldd i s tu rban c er e tu rnin t e rv a l so f 20y ea r sands ixy ea r s ,wh i chb ra ck e tth ee s t ima t e so fth e p r e -Eu ro -Am e r i canfi r er e tu rnin t e rva lfo rth eW i l l am e t t e Va l l ey E co r eg ion(Mo r r i s 1934 , W e i sb e rg and Swan son2001 , Wa l she ta l .2010 ) ,anda r eth e r e fo r e app rop r ia t el im i t sfo ras en s i t iv i tyana ly s i s . W eimp l e m en t edd i s tu rban c einaspa t ia l lyrandomandd i sa g g r e - 2 3 5 g a t edf a sh ion ,un l ik ean yd i s tu rb an c eth el and s c ap ei s l ik e l ytoe xp e r i en c e ,ino rd e rtoe xp lo r ea w id er an g eo f po t en t ia l mod e lb eha v io r . Th ein t e ra c t ion so fth i s v e g e t a t ion mod e lw i tha m e ch an i s t i cfi r e mod e landa m e ch an i s t i c mod e lo f hum anl and -m an a g em en td e c i s ion sinfu l l ycoup l edEn v i s ionrun sw i l lb eth esub j e c to f fu tu r ep ap e r s(G .I . Yo sp in ,u n p u b l i s h e dd a t a) . Th i s imp l em en t a t ion o fg en e r i cd i s tu rb an c e , how e v e r ,a l low ed u stoe xp lo r eth er an g eo fb eh a v io rth a t CV STSMp rodu c e s wh ensp e c ifi cd i s tu rb an c ef r equ en c i e s a r ea s so c i a t ed w i thd i f f e r en tc l im a t es c en a r io s . D i s tu rb an c eandc l im a t ein t e r a c t eds t ron g l ytod r i v e v e g e t a t ionch an g einCV -STSM(F i g .4 ) .B ya g g r e g a t in g a c ro s sth een t i r el and s c ap e ,F i g .4show sbo thth er an g e andc en t r a lt end en c yo f CV -STSMo v e rthou s and so f ind ep end en ts imu l a t ion s . W i thou td i s tu rb an c eo rc l i m a t ech an g e(F i g .4A ) ,th e r ew a sano v e r a l lt r endinth e l and s c ap etow a rd Dou g l a s -fi rfo r e s ta tth ee xp en s eo f o aks a v ann a ,wh i l eo akwood l andin i t i a l l yin c r e a s edand th ens t ab i l i z edun t i lth eendo fth e9 3 y r mod e lrun .A s CV -STSMrun sp rob ab i l i s t i c a l l yfo rlon g e rp e r iod so f t im e ,lo s s e sb e g intoa c c ru eino ak wood l andon c eth e poo lo fo aks a v ann ai se xh au s t ed( e . g . ,a sinF i g .3 ) ,un t i l mo s to f th eland s cap eb e com e s va r iou s typ e so f Dou g l a s -fi rfo r e s t ,con s i s t en tw i thth eth eo r e t i c a lc l i m a t i c c l im a xv e g e t a t ionfo rth i sa r e a(F r ank l in and D y rn e s s1 9 8 8 ) . W i thsu ffi c i en td i s tu rb an c e , how e v e r , th e r ew a sas t ab i l i z a t iono rin c r e a s eino aks a v ann aand anin c r e a s einb i g l e a fm ap l e ,a c comp an i edb yr edu c ed in c r ea s e sto Doug la s -fi rfo r e s t andlo s s e sto oak wood l and ,con s i s t en tw i thth eth eo r e t i c a lfi r ec l im a x fo rth i sa r e a(H ab e ck1 9 6 1 ,F r ank l inand D y rn e s s1 9 8 8 ) . Th ee f f e c to fc l im a t ech an g ew a sh e a v i l yd ep end en ton d i s tu rban c e , andin g en e ra l ,a l lc l ima t es c ena r io s p rodu c eds im i l a rch an g e sinv e g e t a t ionfo ran yg i v en d i s tu rb an c es c en a r io b yy r9 0 ,n e a rth e end o fth e s imu l a t ion(F i g .4 ) . W i thou td i s tu rb an c e ,th ec l im a t e ch an g es c en a r io sh adl i t t l eimp a c t on v e g e t a t ion .In con t r a s t ,und e rth esho r t e s td i s tu rb an c er e tu rnin t e r v a l a l lo fth ec l im a t e ch an g es c en a r io sg en e r a t ed al a r g e r edu c t ioninth eamoun to f Dou g l a s -fi rfo r e s tb yth eend o fth e mod e lrunandin c r e a s edth eamoun to f no v e l lo c a lco v e rt yp e s( e . g . ,m ad ron efo r e s t ) .O aks a v ann a h ab i t a t sin c r e a s edw i thin c r e a s in gd i s tu rb an c er e g a rd l e s s o fp ro j e c t edc l im a t ech an g e and a ch i e v edsom ewh a t h i gh e r qu an t i t i e sth an und e r no c l im a t e ch an g ea t i s tu rb an c el e v e l s . comp a r ab l ed Th ein t e ra c t ion b e tw e en d i s tu rb an c e and c l im a t e ch an g ea l soshow edsom eo fth enu an c e sd i f f e r en t i a t in g howth e GCM sp ro j e c tc l im a t ech an g efo rth es tud ya r e a (B a ch e l e te ta l .2 0 1 1 , Ro g e r se ta l .2 0 1 1 ) . Wh i l ea l lth r e e GCM sp ro j e c t edw a rm in ginth es tud ya r e a ,H ad l e yand M IROCp ro j e c t edsub s t an t i a landcomp a r ab l ew a rm in g ( ;4 . 28 C ) , wh i l e CS IRO p ro j e c t edth el e a s tw a rm in g po in tint im e .S imu l a t ion sw e r econdu c t ed w i thas i t eind e xo f3 0 . 4 8 mund e rth em a r i t im ee v e r g r e enn e ed l e l e a ffo r e s tpo t en t i a l v eg e ta t iontyp e . 2 36 E co log i ca l App l i ca t ion s Vo l .25 , No .1 GABR IELI . YOSP INET AL . ( ;2 .6 8 C ) . CS IROp ro j e c t edala rg e rin c r ea s ein m e an annua lp r e c ip i ta t ion than M IROC , wh i l e Had l ey p ro j e c t edsma l ld e c r ea s e sin m eanannua lp r e c ip i ta t ion (Rog e r se ta l .2011 ) . Had l eyp rodu c edth e mo s tr ap id chang e sinv eg e ta t ion wh end i s tu rban c eo c cu r r edinth e l and s cap e ,w i thth ela rg e s tin c r ea s e sinoakand mad ron e cov e rtyp e s . Byth eend o fth es imu la t ion s , how e v e r , v eg e ta t ion g rown und e rth eth r e e GCM st end edto conv e rg e . M IROCp rodu c edl i t t l echang efo r mo s to f th es imu la t iont im e .Th era t eo fv eg e ta t ionchang ea tth e end o f th e M IROC s imu la t ion s w i th d i s tu rban c e , how ev e r ,fa rex c e ed edth era t e so fchang es e enund e r th eo th e r comb ina t ion so fc l ima t e and d i s tu rban c e s c ena r io s . Pond e ro sa p in e app ea r ed , bu t on ly v e ry b r i efly ,intwo ep i sod e s du r ingth es imu la t ion( s e e App end ix C ) .A ti t sg r ea t e s tex t en t(und e r Had l eyand th e17 %d i s tu rban c er eg im e ) ,pond e ro sap in ecov e rt yp e s o c cup i edapp rox ima t e ly2 .8% o fth eIDU sinth es tud y a r ea . Spa t ia lou tpu t G iv en th e spa t ia l ly random and d i sagg r ega t ed na tu r eo fth ed i s tu rban c eu s edinth e s es imu la t ion s , i ti sinapp rop r ia t etoov e r in t e rp r e tth espa t ia lou tpu t f romth ed i s tu rban c es imu la t ion s .W i thth i scav ea tin m ind , how ev e r ,th espa t ia l ou tpu tr ev ea l simpo r tan t mod e ldynam i c s(F ig .5 ) .B e cau s eth eimp l em en ta t ion o f CV -STSMin Env i s ioni s ba s ed on t ran s i t ion p robab i l i t i e s op e ra t inginthou sand so f IDU s ,th e spa t ia lou tpu tshowninF ig .5r efl e c t sth eou t com e so f thou sand so find ep end en ts imu la t ion s . Th ein i t ia l land s cap e con ta in ed a m ix t u r eo f oak , Doug la s -fi r , and b ig l ea f map l e cov e rtyp e s (F ig . 5A ) . W i th a d i s tu rban c er e tu rnin t e rva lo fs ixy r sandnoc l ima t e chang e , oak o c cu r r edla rg e ly onth elow e rs lop e so f th e va l l ey foo th i l l s , wh i l e map l ela rg e ly o c cu r r ed fu r th e r up s lop e (F ig s . 2 and 5B ) . Con t empo ra ry ob s e rva t ion s show a s t rong map l ep r e s en c e and o c ca s iona l dom inan c ein up land sfo l low ing d i s tu r ban c e byt imb e r ha rv e s t( Johann e s s en e ta l . 19 71 ) ; CV -STSM ma t ch e sth e s e ob s e rva t ion s . Onth eo th e r hand ,v eg e ta t ion map sf rom1851dono tshow map l e dom ina t ed s tand s in th e up land s ,l ik e ly b e cau s e w i ldfi r e wa sl e s sf r equ en ta th igh e re l eva t ion s away f romth e va l l ey floo r , andth ec l ima t e wa sl ik e ly som ewha tcoo l e ra tth eendo f‘ ‘Th eL i t t l eI c e Ag e . ’ ’ Th es t rongin t e ra c t ion sb e tw e enc l ima t echang eand d i s tu rban c ew e r ea l soappa r en tspa t ia l ly .A r ea so fth e land s cap etha tex i s t eda s Doug la s -fi rfo r e s tw i thou ta sub s tan t ia loakcompon en ta tth es ta r to fth es imu la t ion w e r ea lmo s ten t i r e lyconv e r t edto mad ron eco v e r typ e s und e rth eh igh d i s tu rban c er eg im e(F ig . 5C ) . Mu ch o f th eland s cap e , aga in ,e sp e c ia l lyin th e low land s ,r ema in edino rchang edtoop enoaksav anna cov e rtyp e s . Th i s wa s mo s tl ik e ly du etoth e oak ’ s ab i l i tytor e sp rou tfo l low ings tand r ep la c ing d i s tu r ban c e . DISCUSSION Th el ik e l ihoodth a t DGVM sc ana c cu r a t e l yp r ed i c t v eg e t a t ion dynam i c s and d i s tu rban c einin t en s iv e ly hum an -m an a g edl and s c ap e ssu cha sth ew i ld l and –u rb an in t e r fa c ei sr emo t e . DGVM sa r e no td e s ign ed to m e ch an i s t i c a l l ys imu l a t ean th ropo g en i cd i s tu rb an c eo r r e a l i s t i cl and -u s ed e c i s ion -m ak in ga tafin esp a t i a lg r a in andl a ckt im el a g scon f e r r edb yt r e elon g e v i t y .Inh e a v i l y m an a g edl and s c ap e s ,fu tu r es imu l a t ion sw i th DGVM s th a tp ro j e c t po t en t i a ln a tu r a lv e g e t a t ion m a y no tb e r e l e v an tto m an a g e r sin t e r e s t edinch an g e stoe x i s t in g l andco v e ro v e rth en e x ts e v e r a ld e c ad e s .O th e r mod e l in g p ro j e c t s tha t hav ein co rpo ra t ed manag em en tin to DGVM sa r eo f t enun ab l etod e l i v e rd e t a i l eda s s e s sm en t s o fl and co v e rch an g eo v e rth esho r tt im e ho r i zon sa t wh i chl and -u s ed e c i s ion sa r em ad e(S ch e l l e re ta l .2 0 0 7 ) . CV -STSM , th e r e fo r e ,p rov id e san e c e s sa ry b r idg e b e tw e en DGVM s andl and -u s ed e c i s ion mod e l sth a t w i shtos imu l a t ech an g e stoe x i s t in gl andco v e r . CV -STSM p rodu c e s exp e c ted dynam i c s w i th o r w i thou td i s tu rb an c e und e rcu r r en tc l im a t e ,su g g e s t in g th a ti tapp rop r i a t e l yd ep i c t scu r r en tv e g e t a t iond yn am i c s . W i thou td i s tu rb an c e ,s t a t e sf rom m an ys t a r t in g cond i t ion scon v e r g edtoth e dom in an tcu r r en tco v e r t yp e , Dou g l a s -fi rfo r e s t ,und e rbo thcu r r en tandfu tu r e c l im a t e . Th ep a r t i cu l a rc l im a t e ch an g es c en a r io sa f f e c t edth e s et r a j e c to r i e son l ym a r g in a l l y .B e c au s eCV -STSM a s sum e sth a te s t ab l i sh edfo r e s ts t and sp e r s i s t und e r fu tu r ec l ima t e , th e r ea r e no d rama t i c chang e sin v e g e t a t iondu etoc l im a t ech an g ew i thou td i s tu rb an c e . How e v e r ,th e r ew a sas t ron gin t e r a c t ionin CV -STSM b e tw e en d i s tu rban c e and c l ima t e chang ee f f e c t s on v e g e t a t ion . W i ths t and r ep l a c in gd i s tu rb an c e s ,c l im a t e ch an g er e su l t sinin c r e a s in g dom in an c eo fe s t ab l i sh ed r e sp rou t in gsp e c i e s ,andth eem e r g en c eo fno v e lv e g e t a t iont yp e s .Th ein c r e a s e sa r ee sp e c i a l l yp ronoun c edw i th th eh i gh e rf r equ en c yd i s tu rb an c er e g im eund e rth eho t , d r yH ad l e ys c en a r io ,a sw e l la sa tth eendo fth ew a rm , w e tM IROCs c en a r io .B e c au s eth e mod e li ss en s i t i v eto th esp rou t in gc ap ab i l i t i e so fdom in an tt r e esp e c i e s ,w e en cou r a g efu tu r efi e ldwo rkth a t cou ld h e lpsuppo r t , r e fu t e ,o rr e fo rmu l a t ehow w eh a v ep a r am e t e r i z edt r e e sp rou t in g andt r an s i t ion p rob ab i l i t i e s ,in c lud in gth e ab i l i t yo fsubdom in an tt r e esp e c i e sth a tcu r r en t l ya r e p r e s en ta ton l ylowl e v e l sinth el and s c ap etoem e r g ea s commun i ty dom in an t s du eto c l im a t efo r c in g . CV STSMsu g g e s t sth epo t en t i a lfo rr ap idandp ronoun c ed ch an g e sinl andco v e rund e r mo r es e v e r efu tu r ec l im a t e ch an g e . On eo fth em a jo rt e chn i c a lch a l l en g e sincoup l in g d i f f e r en tc l a s s e so f mod e l si sb r in g in gou tpu t sandinpu t s f romv a r iou s mod e l sandd a t asou r c e sin tocon g ru en c e (K e rn se ta l . 2012 ) . W e co r r e la t ed a m e t r i co f p rodu c t i v i t yf romag lob a l mod e lo fp ro j e c t edv e g e t a t ionw i thon eb a s edonemp i r i c a lm e a su r em en t so flo c a l cond i t ion s .Th i sr e l a t ion sh ipw a sin co rpo r a t edin toCV STSMb ydown s c a l in gin fo rm a t ionf romth e8 0 0 -mg r id c e l l sin MC 1tosm a l l e r ,i r r e gu l a rpo l y gon sinou rs tud y Janua ry2015 S IMULATED CL IMATEIMPACTS ON VEGETAT ION 2 3 7 FIG.4 . P ro j e c t eds t a t e and t r an s i t ions imu l a t ion mod e l(STSM )co v e rt yp e sinnumb e ro fin t e g r a t edd e c i s ionun i t s( IDU s )a t fou rt im epo in t sw i thth r e eg lob a lc i r cu l a t ion mod e l s .D e s c r ip t ion so fth eco v e rt yp e sa r einT ab l e1 .C l im a t es c en a r io sa r e(A –C )no chang e ,(D–F )CS IROA 2 ,(G – I )H ad l e y ,and( J –L )M IROCA 2 .D i s tu rb an c er e g im e sa r e(A ,D ,G ,J )nod i s tu rb an c e ,(B ,E ,H ,K ) 5 %d i s tu rb an c ep e ry e a r ,and(C ,F ,I ,L )1 7% d i s tu rb an c ep e ry e a r .Th e mo s tcommonpu rp l ehu einp an e l sE ,F ,H ,I ,K ,andL co r r e spond stoth em ad ron e(M )co v e rt yp e . 2 38 GABR IELI . YOSP INET AL . E co log i ca l App l i ca t ion s Vo l .25 , No .1 FIG.5 . S imu la t edp l an tco v e rt yp e sshownsp a t i a l l yfo rth es tud ya r e afo r(A )y e a r0 ;(B )noc l im a t ech an g e ,1 7 %d i s tu rb an c e , y ea r90 ;(C ) Had l ey A 2 ,1 7 %d i s tu rb an c e ,y e a r9 0 . Janua ry2015 S IMULATED CL IMATEIMPACTS ON VEGETAT ION 2 3 9 FIG.5 . Con t inu ed . a r ea tha t con fo rm ed to so i l typ e bounda r i e s and p ro j e c t ingchang e sins i t ep rodu c t iv i tyin toth efu tu r e . F ina l ly , w ed ev e lop ed a m ean s to ma t ch b road d e s c r ip t ion so f po t en t ia lv eg e ta t ion typ e sf rom a DGVMtop lan tcommun i t i e so fknownsp e c i e scompo s i t ion ,in c lud ing bo th cu r r en t and po t en t ia lfu tu r e v eg e ta t iontyp e s . Th rougha l lth e s es t ep sw ew e r eab l e tot ra inandcon s t ra inanSTSMtha twa spa ram e t e r i z ed w i thr e su l t sf rom a b iom e t r i cfo r e s ts tand mod e lo f v eg e ta t ionchang etob econg ru en tw i thth ev eg e t a t ion r e spon s e stoc l ima t echang ep ro j e c t edbya DGVM .Th i s cong ru en cyi stobo thth eth r e sho ld sb e tw e env eg e t a t ion typ e sin MC1andth econ t inuou sou tpu tva r iab l e sf rom MC1 . Wh i l esom echang e sin PVT sin MC1 ma yb e fa s t e rthanchang e sincov e rtyp einCV -STSM ,th i sw a s ad e s igncho i c etha ta l low edu stod e s c r ib ev eg e ta t ionin d e ta i l , wh i l es t i l la l low ingfo rt r end sinb iog eo ch em i c a l p ro c e s s e stod i r e c tsu c c e s s iona lt ra j e c to r i e s .Inth i sw a y , ou r wo rki s a ma jo rs t epfo rwa rdr e la t iv eto o th e r , p r ev iou s mod e l ingp ro j e c t s( e .g . ,S ch e l l e re ta l .2 0 0 7 ) , b e cau s e CV -STSM canfa c i l i ta t ea c coun t ingfo rth e dynam i ccon s equ en c e so fland manag em en t onl and cov e r . W ehav et ran s la t edanin c r ea s ingdom inan c eo fn ew MC1 PVT sa sr ep r e s en t ingin c r ea s ing dom inan c eo f Pa c ifi c mad ron e and pond e ro sa p in ecov e rtyp e s ,a s th e s esp e c i e so c cu rinth ecu r r en ts tudy a r ea a tlow abundan c e sandth e s ecov e rtyp e sr ep r e s en tth en e a r e s t sp e c i e sa s s emb l a g e sth a ta r er ep r e s en t a t i v eo fth en ew PVT s . Ou rr e l i an c e one x t an tr e g ion a lsp e c i e sa s s em b la g e sto p a r am e t e r i z e su c c e s s iona lt r an s i t ion sth a t in c lud e no v e lfu tu r ev e g e t a t iont yp e sa l low ed u sto in co rpo ra t e emp i r i ca l ly ba s ed ra t e so f su c c e s s iona l ch an g eth a tb e g inf romth ecu r r en tv e g e t a t ion w i thou t m and a t in gn ewdom in an tt r e esp e c i e sinth en e a rfu tu r e . Th i sd e c i s ionr e s t sonar e l a t i v e l ycon s e r v a t i v ea s sump t ionth a tsp e c i e sth a tdono tcu r r en t l yo c cu rlo c a l l ya r e un l ik e l ytoimm i g r a t e ,e s t ab l i sh ,andb e com edom in an t inth en e x t9 0y e a r s .Th eSTSMf r am ewo rk ,how e v e r ,i s su ffi c i en t l y ad ap t ab l eth a tt ru l y no v e lsp e c i e sa s s em b lag e s cou ld b ein co rpo ra t ed shou ld th eu s e rb e p r ep a r edtod efin eandp a r am e t e r i z et r an s i t ion samon g th e s es t a t e s . R a t e so fch an g einv e g e t a t i v eco v e rw e r e mu chs low e r in CV -STSMs imu l a t ion sth anin MC 1s imu l a t ion s . Th e r ea r etwor e a son sfo rth i s .F i r s t , MC 1a s sum e sth a t v e g e t a t ionqu i ck l yr e a ch e si t sm a x imuml e a fa r e aind e x . Th i si s du ep r in c ipa l lytot emp e ra tu r e and wa t e r l im i t a t ion ,and ,toal e s s e re x t en t ,n i t ro g end yn am i c s . T r an s i t ionr a t e sin CV -STSM , how e v e r ,w e r ed e t e r m in edin FVSb a s eduponr e g ion a l l yd e r i v eds t a t i s t i c a l r e l a t ion sh ip so ft r e eg row th ,comp e t i t ion ,and mo r t a l i t y . T ran s i t ion ra t e sf romth e ob s e rv ed dynam i c stha t p a r am e t e r i z e FVSa r e mu chlow e rth antho s eimpo s ed b y ph y s io lo g i c a ll im i t a t ion sin MC 1 .S e cond , MC 1 ou tpu t sshow ed noe v id en c eo fsub s t an t i a ld rou gh t - 2 40 E co log i ca l App l i ca t ion s Vo l .25 , No .1 GABR IELI . YOSP INET AL . r e la t ed mo r ta l i tyev en t sinth es tudya r ea .B e cau s eo f th i s , CV -STSM ’ sa s sump t iontha te s tab l i sh edfo r e s t s tand scano th e rw i s ep e r s i s tund e rfu tu r ec l ima t em e an t tha ti tp ro j e c t ed no d rama t i c chang e sin v eg e ta t ion w i thou td i s tu rban c e .Th elongl i f e span so f manyo fth e t r e e sp e c i e s( e .g . ,.500 y ea r sfo r Doug la s -fi r ) and p a l eo e co log i ca lr e con s t ru c t ion s(Ro l l in sone ta l .2 0 1 2 ) h e lpju s t i fyth i sa s sump t ion .H igh e rl ev e l so fd i s tu rb an c e in c r ea s edth econv e rg en c eb e tw e enp r ed i c t ion sf romCV STSM and MC1 b e cau s ed i s tu rban c ea l low ed mo r e r ap idsu c c e s s iona l chang e sa sin fo rm ed by MC 1 .I f c l ima t echang ei ss ev e r eenoughtok i l ldom inan tt r e e sp e c i e so rp r ev en ts e ed l ing e s tab l i shm en t ,th en CV STSM w i l l und e r r ep r e s en tc l ima t ee f f e c t s onra t e so f v eg e ta t ionchang e .W econ s id e rth i sun l ik e lyinth en e a r fu tu r e( i . e . , un t i l2050 ,a t wh i ch po in tfu tu r ec l im a t e p ro j e c t ion sb eg ind iv e rg ingrap id ly ) ,g iv enth ecu r r en t m i ldc l ima t eand p ro j e c t edl im i t edchang einc l im a t e a v e rag e sinth es tudya r ea ,a sw e l la sth eb roadr eg ion a l d i s t r ibu t iono fa l lo fou rdom inan tandsubdom in an t t r e esp e c i e s .C l ima t echang ecou ldin c r ea s e dom in an t t r e esp e c i e s ’su s c ep t ib i l i t i e stos tand r ep la c ing d i s tu r b an c e s ,su cha sin s e c to rpa thog enou tb r eak s .I fth a t w e r eth eca s e ,th ein t e ra c t iono fd i s tu rban c eandt r e e r ep la c em en t wou ldb r ingth era t e so fv eg e ta t ionch an g e p ro j e c t edin CV -STSMand MC1in toc lo s e ra l ignm en t . Th eimpo s i t iono fspa t ia l lyrandomd i s tu rban c e sa t r egu la rin t e rva l sa l low edu stod i r e c t lyt e s tth ee f f e c t so f d i s tu rban c eon mod e ldynam i c s . Th et im ingo fv eg e t a t ionchang e sp ro j e c t ed by MC1 ha sth e po t en t ia lto sub s tan t ia l lya l t e rsu c c e s s iona lt ra j e c to r i e sinth e mod e l wh ena m e chan i s t i cfi r e mod e landv eg e ta t ion man a g e m en ta r e coup l ed w i th CV -STSMin Env i s ion . Fo r e xamp l e ,und e rth e Had l eyp ro j e c t ion sw i th MC1th e r e w e r etwo p e r iod s du r ingth e 21 s tc en tu rytha tw e r e f avo rab l efo r con t in en ta l ev e rg r e en n e ed l e l ea ffo r e s t g row th( s e e App end ix C ) .I fla rg es tand r ep la c ingfi r e s w e r etoo c cu rdu r ingon eo fth e s ep e r iod s ,pond e ro s a p in ecou ldin c r ea s eindom inan c einth e s ea r ea s ,w i th e f f e c t stha tla s tfo rd e cad e s . O th e r mod e l inge f fo r t s hav ein c lud ed d e ta i l ed d e s c r ip t ion so fv eg e ta t ion ,humanland manag em en t ,and d i s tu rban c eund e rp ro j e c t edc l ima t echang e(K ean ee t a l . 1996 , Ba ch e l e te ta l . 2001 ,S ch e l l e re ta l .2 0 0 7 , M edv igye ta l .2009 , Mo eu rand Vand end r i e s ch e201 0 ) . How ev e r , CV -STSMadd r e s s e sc en t ra li s su e sn e ed edto l ink mod e l so fc l ima t e chang eimpa c t stos imu la t ion so f humanland u s e .I tin co rpo ra t e sk ey dynam i c so fa DGVM , wh i l e add r e s s ing c ru c ia ll im i ta t ion s . Th e s e in c lud eu s ingcu r r en tv eg e ta t iona sas ta r t ingpo in tfo r s imu la t ion sanda t t enua t ingra t e so fsu c c e s s iona lch an g e totho s esuppo r t edbyr ea l i s t i cra t e so ft r e eg row thand r ep la c em en t .A l thoughland -u s es c ena r io sa r ea tp r e s en t on lyexp l i c i t lycon s id e r eda scompon en t so fth eem i s s ion ss c ena r io sd r iv ingth es imu la t ion s(Mo s se ta l . 2 010 ) ,CV -STSMa l low shumanland manag em en ttob e in co rpo ra t ed m e chan i s t i ca l lyby mod e l ingv eg e ta t iona t aspa t ia lg ra inandtaxonom i cr e so lu t ioncomm en su r a t e w i thth ew a y sin wh i ch p eop l e m an a g el and s c ap e s . Mod e l in gtoo l sl ik eCV -STSMa r eamon gth em an yn e x t s t ep sn e ed edto h e lp p lann e r s andland m ana g e r s d e v e lop e f f e c t i v e , ad ap t i v ep l an so fa c t ionth a tc an r efl e c tth ee xp e c t edb ro ad s c a l er e spon s e so fv e g e t a t ion tor ap idch an g e sinr e g ion a lc l im a t e . ACKNOWLEDGMENTS Th eau tho r sth ank D a v idConk l inandT imo th ySh e eh anfo r h e lp w i thth ed e v e lopm en to fcod efo r MC 1and CV -STSM . Th eau tho r sa l soth anktwoanon ymou sr e v i ew e r sfo re x t r em e l y p rodu c t i v ecomm en t sonth eo r i g in a lm anu s c r ip t .Fund in gfo r th i s wo rkc am ef romth eN a t ion a lS c i en c eFound a t ion(G r an t No .0 8 1 6 4 7 5 ) . LITERATURECITED Aka ik e , H . 1974 . An ewlook a t th es ta t i s t i ca l mod e l id en t ifi c a t ion . IEEE T r an s a c t ion s on Au tom a t i c Con t ro l 1 9 : 7 1 6– 7 2 3 . A lb an i ,M . ,D .M ed v i g y ,G .C . Hu r t t ,andP .R . 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