Fig. 2: Variable importance.
From: Grazing reverses climate-induced soil carbon gains on the Tibetan Plateau
The values were derived from random forest models for the effects of 9 environmental variables on soil intrinsic turnover time (τi) of fast (a), slow (b) and passive (c) pools. These variables include normalized difference vegetation index (NDVI), mean annual temperature (MAT; °C), mean annual precipitation (MAP; mm), soil bulk density (g/cm3), soil pH value, soil organic carbon (g/kg), soil total nitrogen (g/kg), soil clay content (g/kg).
