Fig. 4: Structural equation models of vegetation productivity.
From: Bedrock geochemistry influences vegetation growth by regulating the regolith water holding capacity
Two separated SEMs for the indirect effects of bedrock chemical elements (left: BRSi, right: BRCa) on NPP. The selection of explanatory variable terms in the results of single LMs and previous knowledge (Table 1). The blue arrows indicate positive effects, and the red arrows show negative effects. Standardized regression coefficients are given, with the thickness of the arrows expressing the size of the standardized regression coefficients. The R2 values of each model (black) and the total effect of response variables (blue) are given between the brackets. Adjusted R-squared (R2) and levels of significance are shown (*p < 0.05, **p < 0.01, ***p < 0.001).
