Fig. 2: The latitudinal patterns and breakpoint estimation for soil microbial metabolic limitations across Chinese forests.

a, b The latitudinal breakpoints for microbial metabolic limitations were estimated using piecewise regression analyses, and relationships of relative C limitation (a) or N/P limitation (b) with latitude in Chinese forests were identified using generalized linear models. The shaded circles indicate breakpoint latitudes, while shaded areas are the 97.5% confidence intervals of the breakpoints. Solid black lines indicate model fits between relative C limitation or N/P limitation and latitude. c Estimated latitudinal breakpoints for soil microbial metabolic limitations among different soil layers across Chinese forests.