Microbial biomass C, N and P ratios (mass ratios) compared with the reference ratios (mass ratios) proposed by Cleveland and Liptzin.

Refer. ratio is the reference ratio that was proposed by Cleveland and Liptin [36]. Min and Max represent the minimum and the maximum microbial biomass ratios, respectively, in the six vegetation zones. n, t and p refer to sample size, the test statistic and the probability value for the one-sample T test that compared the microbial biomass ratios with the Refer ratios. In addition, the data used in the T test were normally distributed based on the one-sample Kolmogorov-Smirnov test.