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Table 3 Correlation coefficient between soil organic carbon (SOC) and mean annual precipitation (MAP), mean annual temperature (MAT), sand, silt, clay, age, altitude, and pH for all tree species and the four categories of tree stands

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
  1. *Significant at p < 0.05 (using t test)