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Random forest mean predictor importance (% of increase of MSE) of biotic and abiotic drivers on the spatial variability (coefficient of variation) of soil multifunctionality (SVM, a), N-related variables (SVM-N, b), C-related variables (SVM-C, c), and P-related variables (P-SVM, d). Significance levels of each predictor are as follows: *P<0.05, **P<0.01, and ***P<0.001.
