Table 1.

The explanatory weight ratio of each dimension.

Index	RDA1	RDA2	R2	p values
TOC	0.9214	− 0.3885	0.7120	0.001
NO3-N	0.8699	− 0.4931	0.6908	0.001
TN	0.8397	− 0.5431	0.6881	0.001
NAG	0.7345	− 0.6786	0.2889	0.007
AP	− 0.7133	− 0.7008	0.2797	0.005
CB	0.6993	− 0.7148	0.1055	0.162
pH	0.6741	0.7387	0.5722	0.001
NH4-N	0.6187	− 0.7856	0.5958	0.001
BG	− 0.5433	− 0.8395	0.0352	0.545
ACP	0.0254	− 0.9997	0.2740	0.008

Bold p values represent the significant environmental variables tested by RDA method.

TOC total organic carbon, TN total nitrogen, NH₄-N ammoniacal nitrogen, NO₃-N nitrate nitrogen, AP available phosphorus, BG β-1,4-glucosidase, ACP acid phosphatase, NAG β-1,4-N-acetylglucosaminidase, CB β-d-cellobiosidase.