From: Influence of trees and associated variables on soil organic carbon: a review
 | All tree species | Coniferous | Deciduous | Evergreen | Mixed | |||||
---|---|---|---|---|---|---|---|---|---|---|
R2 (%) | r | R2(%) | r | R2 (%) | r | R2 (%) | r | R2 (%) | r | |
MAP | 0.9 | 0.09 | 13.0 | 0.36 | 3.3 | − 0.18 | 48.6 | 0.69 | 0.1 | 0.03 |
MAT | 13.6 | − 0.37* | 0.4 | − 0.06 | 27.2 | − 0.52* | 1.7 | − 0.13 | 21.4 | − 0.45* |
Sand | 36.7 | − 0.61* | 40.8 | − 0.63* | 27.7 | − 0.52* | 88.0 | − 0.93* | 35.7 | − 0.59* |
Silt | 33.6 | 0.58* | 22.1 | 0.47 | 11.3 | 0.33 | 96.0 | 0.97* | 52.6 | 0.72* |
Clay | 1.2 | 0.11 | 31.2 | 0.56* | 2.4 | 0.15 | 37.0 | 0.60 | 4.8 | − 0.21 |
Age | 27.0 | 0.52* | 3.3 | 0.18 | 23.5 | 0.48 | 1.6 | 0.13 | 2.6 | − 0.16 |
Altitude | 2.0 | 0.14 | 0.1 | 0.04 | 25.0 | 0.50* | 100 | 1.0 | 14.0 | 0.37 |
pH | 3.7 | − 0.20 | 6.2 | − 0.25 | 8.2 | − 0.28 | 1.7 | 0.13 | 10.8 | − 0.32 |