Table 4. Correlations between organic carbon stock and numeric variables. All correlations are significant at the 95% confidence level.
Variable Pearson Correlation with Carbon Stock p-value
% Silt 0.531 9.2E-49
% Sand -0.524 2.4E-47
% Clay 0.298 7.0E-15
Depth -0.292 2.6E-14
x (longitude) 0.284 1.4E-13
elevation 0.279 3.8E-13
y (latitude) -0.275 7.9E-13
Mean annual temperature -0.244 2.8E-10
Drainage area -0.217 2.1E-08
Mean annual precipitation -0.204 1.4E-07
NDVI 0.124 1.5E-03