RESEARCH NOTES '-'·1,\nS'S
coP
.Issued o/ tM f\LE.
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PACIFIC NORTHWEST FOREST .AND RANGE. EX PERJMENT STATION
lt.,o_-- 2_----
CORD iOOD VOLUME TABLES FOR SECOND-GRO\.JT
DOUGLAS-]fiR
By George R. Staebler and Elmer W. Shaw Pacific Northwest Forest & Range E;xperiment Station Puget Sound Research Center The increasing harvest of second - growth Douglas-fir for · pulpwood
makes cordwood volume tables, based on the conventional measures of tree
diameter and height,
useful tools for the pulpwood operators and forest
managers seeking to determine the merchantable contents of their stands.
Recent investigations in the Puget Sound vicinity into the cubic-foot
content of a cord of 8-foot bolts of Douglas-fir mB.ke it possible to con­
·
struct such tables a
Table l shows the number of cords in trees of different diameters
and heightsG
(These are stacked cords of unpeeled 8-foot bolts. )
It is
assumed that the tree will be utilized to a 4-inch top inside the hark,
and that stump heipht equals the d.b.h. of the tree.
It is simply
a
conventional volume table using cords as the unit of measure and may be
conve ntionally applied.
Table 2,
giving the number of trees required to make a cor d,
is
useful in visualizine second-frowth trees and stands in terms of cords.
These tables were derived from two sources of basic data.
Cubic­
foot content of trees was taken from "Cubic-foQt, volume table for se·cond­
growth Douglas-fir on forest survey standard,1111 which gives the volume
1./ Douglas-fir
Second-Growth Management Committee.
growth fore ts in the Douglas-fir reg i on.
Exp.
9ta
December 1947.
151 p.
Management of second­
for.
( Table 6A.)
Pac. N. W.
Processed.
& Range
·
·
of the tree stem exclusive of bark and limbs between the stump and a 4­
inch top.
The cubic feet per cord was tc.ken from a local study of the
solid contents of stacked cords of 8-foot woo
having different aver­
are bolt diameters. Diameter of the average bolt that might be taken
from trees of different sizes was estimated by first finding in taper
Th
tables t e e g h of the st m between the stump &.nd a 4-inch top.
.
length d1v1ded
1nto the cub1c-foot vo ume taken from the volume tablel/
gave the bc.sal area of the average bolt which, when translated into di­
ameter, made it possible to find for each tree size class the cubic feet
per cord from the table of cordwood converting factors. Cubic-foot vol­
ume of the tree divided by the corresponding cubic feet per cord gave
the cords per tree shown in table 1.
d2/
?}
Worthington, Norman P. and Melvin P. Twerdal.
Contents of a cord of
eight-foot pulpwooda
Pac. N. W. For. & Range Exp. Sta.
February 28,
1949. Unpublished report.
J/
See footnote 1
-2-
Table 1.--Cordvvood volume in second-growth Douglas-fir trees
•
D.h.h.
Cords per tree
6
8
10
.024
.. 052
081
.034
.068
.107
.042
.085
.131
.. 051
.100
.159
.. 060
119
.186
.070
.139
,.212
.151
.232
.259
.286
12
14
16
18 20
12 0
.. 156
. 156
.205
.263
.191
.251
.323
.. 400
.482
.229
.302
=384
.,478
5 73
.,
,.263
o353
o449
o55l
0661
.. 300
.. 405
511
62 4
7 46
.328
-448
.570
.696
.. 828
.. 363
.494
.. 624
ro772
.916
.406 .441
.538 .593
.640 .696
&799
.673
.744
.. 876
,.948
.826
.. 902
976 1 .. 070 1.171
983 1.073 1.171 1.280 1 390
a566
"660
.. 756
0765
o871
,.955 1,047 1.133 1.,241 1.349 1.,458 1.,602
o863
o975 1.,083 1.169 1,.274 1.393 la500 1.,631 1.,786
..
22 214-
Note: ..
,.
.
.310
Volume of unpeeled stem between stump height equal to d.b.h. and a 4-inch top
d .. i.b.; cordwood assumed to be cut in 8-foot lengths.
Table 2.--Number of second-growth Douglas-fir trees :Qer cord
0
J
Total hei ht of tree in feet
6o
1oo ·11o
9o
8o
7o
Trees :Qer cord·
1
1
1
1
l
·
6
8
10
41 2
19 4
12 3
29ca6
14"8
9 3
23 5
11.8
7 6
19"5
10,0
6,3
16 .. 7
8o4
5 4
12
14
16
18
20
8,.3
6 4
6 4
4 9
3o8
5o2
4o0
3ol
2 .. 5
2ol
4,4
3a3
2o6
2 1
lG7
3 8
2o8
2,2
lo8
1., 5
3,3
2a5
2"0
la6
lo3
1"8
lo5
1"3
1.,3
lol
1,2
laO
22
24
Note:
..
..
.
.,
..
..
..
"
..
l
12o
1
136
1
1
140
1 0
·
14"3 7 2 6 6
4,.7 4.3 3 9
..
3 .. 5
3 .. 2
3<>0
2,2
1 8
1 4
lo2
2 8
2o0
1,6
133
lal
2.,5
1,.9
la5
1,.2
1 .. 0
2 .. 3
lo7
lo3
l l
Oo9
o
1,6
1 .. 3
1 .. 0
0,.9
1"4
1 .. 1
0.9
0,8
lol
0.,9
0.7
laO
0,9
1,.0
Oo9
0"9
Oo8
0"8
0,7
0 .. 7
0.,7
0 .. 7
0,.6
0
0
o
"
Volume of unpeeled stem between stump height equal to d.b. h. and
inch top d.L. b,; cordwood assumed to be cut into 8-foot lengths ..
-3-
a
..
"
6
6
4-