Fig. 2: Tree species richness effects on soil microbial community facets and functions.

A Effect of tree species richness on microbial biomass (i.e., “Total biomass” and “Active biomass”), taxonomic profile (i.e., bacteria to fungi ratio: “B:F”, bacteria Shannon diversity: “Bac. div.”, and fungi Shannon diversity: “Fung. div.”), functional profile (i.e., the abundance of catabolism functional genes: “Cata” and functional genes evenness: “FG eve.”), physiological potential (i.e., substrate-induced respiration efficiency: “SIR efficiency”, and substrate-induced respiration response range: “SIR range”), and microbial respiration. B Relations between tree species richness and total microbial biomass, bacteria Shannon diversity (i.e., “Bacteria diversity”), SIR efficiency, and microbial respiration. The significance levels were standardized across the panels (“.”: p-value < 0.1, “*”: p-value < 0.05, “**”: p-value < 0.01, and “***”: p-value < 0.001).