2.4 Statistical analysis
One-way analysis of variance (least significance difference method) was
used to test for significant differences in biomass, soil physical and
chemical indicators, and organic carbon and nitrogen storage between
different methods and soil layers. The Pearson correlation coefficient
was used to analyse the correlation between plant biomass and nutrient
indicators, and all data were analysed using SPSS 21.0 (with a
significance level of 0.05). Principal component analysis (PCA) of plant
biomass and nutrient indicators was conducted using Origin 2018.