2.7 Statistical analysis
One-way ANOVA and Duncan’s multiple tests (P < 0.05)
were performed using IBM SPSS Statistics 26 (IBM Corporation, New York)
software to compare the means of plant, AM fungi, and soil
physicochemical property data. \soutTwo-way ANOVA was used to analysis
the interaction effect between N addition and soil agglomerate particle
size on GRSP. The correlation between soil physicochemical properties
and herbaceous plants diversity was calculated by Pearson’s test
(two-tailed) at two significant levels, P < 0.05 andP < 0.01. RDA analysis was used to reveal the effect of
soil properties on the community composition of AM fungi.
Structural equation modeling
(SEM) was used to predict causal pathways of N addition, key soil
physicochemical indicators, and AM fungi on herbaceous plant diversity.
Build prior models and evaluate model fit using chi-square, RMSEA, and
GFI.