Figure 4. Structural equation models of N addition and warming effects on soil micro-food web components in a temperate steppe in 2009 (χ2 = 27.511; df = 24, P = 0.281; CFI = 0.975; RMSEA = 0.080).
Numbers on arrows are standardized path coefficients. Width of the arrows indicates the strength of the causal influence (non-significant pathways are dashed). N represents N addition effects; W, warming effects; Soil Char, soil characteristics; Microbe, soil microbial PLFA biomass; and Nema, soil nematode trophic groups.