Degerickx et al. - Carbon stock impact of Jatropha in Mali
Data S2.
Data S2. Soil organic carbon – additional results
Table S2.1.: Means and standard deviations (between brackets) of soil organic carbon
(SOC) concentrations, SOC densities and soil bulk densities (BD) per depth for different
land uses in the two ecoregions (significant differences between land uses are indicated
with differing letters).
Ecoregion
Land use
Depth
(cm)
SOC
%
0.378 a
(0.154)
0.397 c
(0.156)
0.448 ef
(0.169)
0.426
(0.149)
0.469 a
(0.223)
0.437 cd
(0.158)
0.410 e
(0.149)
0.380
(0.121)
0.912 b
(0.695)
0.709 d
(0.610)
0.589 f
(0.370)
0.501
(0.254)
0.783 g
(0.374)
0.664
(0.254)
0.664
(0.456)
0.541
(0.202)
0.794 gh
(0.292)
0.621
(0.199)
0.494
(0.171)
0.515
(0.182)
0.794 h
(0.343)
0.789
(0.419)
0.704
(0.367)
0.621
(0.296)
0-5
5-10
Cropland
10-20
20-30
0-5
Koulikoro
5-10
Jatropha
10-20
20-30
0-5
5-10
Fallow
10-20
20-30
0-5
5-10
Cropland
10-20
20-30
0-5
5-10
Garalo
Jatropha
10-20
20-30
0-5
5-10
Fallow
10-20
20-30
1
SOC
(kg m-3)
5.121 a
(2.166)
5.448 c
(2.151)
5.831
(2.165)
6.007
(2.206)
6.001 a
(2.925)
5.893 c
(0.444)
5.387
(2.043)
5.387
(1.731)
12.030 b
(8.923)
9.853 d
(8.480)
7.499
(4.504)
7.037
(3.568)
6.465 g
(2.843)
5.187
(2.516)
5.008
(3.449)
3.827
(2.276)
7.192 gh
(3.522)
5.208
(2.610)
3.717
(2.304)
3.850
(2.621)
11.590 h
(8.901)
6.736
(3.903)
5.695
(3.969)
4.905
(2.848)
BD
(kg m-3)
1345
(46.1)
1379
(54.6)
1312
(74.6)
1408
(72.9)
1276
(90.2)
1346
(64.6)
1319
(100.1)
1424
(85.7)
1347
(107.4)
1377
(79.2)
1281
(62.3)
1410
(74.9)
1369
(50.8)
1377
(77.7)
1441
(95.4)
1499
(96.4)
1403
(95.5)
1453
(84.3)
1393
(104.4)
1488
(164.8)
1392
(208.6)
1354
(94.6)
1471
(105.4)
1573
(242.9)
Degerickx et al. - Carbon stock impact of Jatropha in Mali
Data S2.
Table S2.2.: Summary of highly significant (P < 0.01) correlations between soil organic
carbon density (kg m-3) and soil texture, gravel content, pH and bulk density.
Ecoregion
Soil variable
Sand %
Koulikoro
Silt %
Clay %
pH
Gravel %
Garalo
Land use
Depth *
Cropland
Jatropha
Fallow
Cropland
Jatropha
Fallow
Cropland
Jatropha
Fallow
Fallow
Cropland
Jatropha
Fallow
Cropland
1, 2, 3
1, 2, 3, 4
1, 2, 3, 4
1, 2, 3
1, 2, 3, 4
1, 2, 3, 4
1, 2
1, 4
1, 2, 3, 4
1, 2, 3, 4
2, 3, 4
2, 3, 4
1, 2, 3, 4
2, 4
Average Spearman
correlation coefficient
-0.50
-0.76
-0.80
0.54
0.83
0.81
0.47
0.51
0.73
0.81
-0.65
-0.70
-0.76
-0.49
pH
Clay %
Fallow
2
0.49
(corrected for gravel %)
*
Depth at which the correlation is highly significant: 1 = 0-5 cm; 2 = 5-10 cm; 3 = 10-20 cm; 4 = 20-30 cm.
2