FIGURE 3 . The results of structural equation modelling (SEM)
showing the relationship between precipitation, nitrogen addition (N),
phosphorous addition (P), arbuscular mycorrhizal fungi (AMF), and
dominant species shoot biomass with above-ground net primary
productivity (ANPP) across two years. Numbers adjacent to arrows are
standardized path coefficients and suggest the effect size of the
relationship. The proportion of variance explained
(R 2) appears alongside the response variables
in the model. Arrows indicate significant (black and solid) and
non-significant (gray and dashed) relationships. Goodness-of-fit
statistics for each model are shown below the model.
χ2 = 15.167, p = 0.232, d.f. = 12; RMSEA =
0.058, p = 0.302; AIC = 81.167.