Figure 2. Structural equation model results of the effects of water availability, functional diversity, functional identity, and species richness of trees on A and B) net diversity effects (NE); C and D) complementarity effects (CE). Panels A and C show the models with direct and indirect effects of fungal community composition (NMDS axes 1, 2, and 3) and panels B and D show the corresponding null models with no fungi effects. Numbers inside of the boxes indicate the conditional R2 for each endogenous variable. Numbers next to arrows represent the standardized coefficient of each path. Blue arrows represent positive effects and red arrows represent negative effects and arrow sizes are scaled to the magnitude of the standardized coefficient. Symbols next to the standardized coefficients indicate the statistical significance of the path (+: P < 0.1; *: P < 0.05, **: P < 0.01, ***: P < 0.001). Paths with P > 0.1 are excluded from the figure.