2.4 Statistical analysis
Statistical analyses were performed using the R i386 3.3.1 (R
Development Core Team) software package. The t-tests were used to
compare grassland and cropland at same soil layer in all sites on SOC,
STN, STP, C:N ratio, NH4+_N and
NO3-_N, soil aggregations, soil
microbial biomass, microbial relative abundance and F:B ratio. Three-way
ANOVA was used to test for significant differences among site, land use,
soil depth and their interactions on the soil microbial biomass.
Correlation analysis were conducted to identify the soil parameters
accounting for the soil microbial biomass.