Table 1. Goodness-of-fit statistics (R²) of environmental factors fitted to the nonmetric multidimensional scaling (NMDS) ordination of microbial community structure and enzyme activities. The significance was based on 999 permutations. Significant factors (P < 0.05) are indicated in bold: *P < 0.05, ** P < 0.01, ***P < 0.001.

	Microbial biomass		Enzyme activities
Varibles	R2	P	R2	P
Total C	0.701	0.001***	0.266	0.007**
Total N	0.424	0.001***	0.073	0.309
C:N ratio	0.717	0.001***	0.032	0.566
Lignin:N ratio	0.280	0.006**	0.090	0.209
pH (CaCl2)	0.460	0.001***	0.315	0.002**
pH (H2O)	0.086	0.258	0.025	0.634
Mg	0.235	0.009**	0.010	0.872
K	0.396	0.001***	0.608	0.001***
Ca	0.288	0.006**	0.063	0.354
P	0.052	0.414	0.352	0.002**
Mn	0.271	0.010**	0.218	0.013*
Fe	0.383	0.001***	0.000	0.999
Cu	0.006	0.910	0.026	0.650
Co	0.073	0.265	0.009	0.919
V	0.001	0.988	0.119	0.149
Water content	0.103	0.166	0.085	0.216
Total lignin	0.094	0.211	0.086	0.218