Table 1 Spearman correlations analysis between the contents of soil chemical properties and the microbial α-diversity indices.

Soil chemical properties	Bacterial α-diversity indices						Fungal α-diversity indices
	Shannon index		Simpson index		ACE index		Shannon index		Simpson index		ACE index
	June	September	June	September	June	September	June	September	June	September	June	September
Microbial biomass carbon	-0.018	0.394^*	-0.068	0.238	-0.091	0.476^**	0.112	0.015	0.054	0.028	-0.266	-0.161
Total nitrogen	0.537^**	0.537^**	0.538^**	0.521^**	0.657^**	0.273	0.147	-0.12	0.130	-0.217	0.005	-0.028
Total phosphorus	-0.032	0.499^**	-0.043	0.580^**	-0.28	0.239	-0.205	-0.234	-0.151	-0.253	-0.181	0.072
Ammonium nitrogen	0.489**	0.694**	0.479**	0.602**	0.243	0.507**	0.054	0.001	0.196	-0.052	0.226	0.017
Nitrate nitrogen	0.139	0.446*	0.098	0.448*	0.032	0.413*	0.011	-0.115	-0.058	-0.205	0.123	-0.072
Rapidly available phosphorus	0.360*	0.488^**	0.373*	0.442^*	0.174	0.017	0.222	-0.112	0.416*	-0.206	0.060	-0.079
Rapidly available potassium	0.565**	0.257	0.538**	0.162	0.372*	0.193	0.224	-0.234	0.352*	-0.273	0.322	0.412^*
pH value	-0.378*	-0.659**	-0.384*	-0.581**	-0.563**	-0.428*	-0.113	0.274	-0.07	0.375*	-0.281	0.111
Urease activity	0.372*	0.452^**	0.308	0.491^**	0.526**	0.141	0.168	-0.055	0.069	-0.165	0.269	0.186
Sucrase activity	0.645**	0.173	0.624**	0.198	0.730**	-0.068	0.387*	-0.221	0.346	-0.309	0.268	0.214
Catalase activity	-0.321	0.683^**	-0.331	0.648^**	-0.368*	0.431^*	-0.376*	-0.211	-0.3	-0.296	-0.336	-0.148

The value stand for correlation coefficient, “*”, “**” indicate significant differences at the confidence levels of 0.05 and 0.01, respectively. The same below.

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