Table 2.

Spearman’s correlation coefficients between environmental variables.

	SOM	Water content	pH	Mn	Cr	Zn	Cu	K	P
N	0.383	0.386	-0.155	0.436	0.347	0.208	0.743∗∗	-0.056	0.483∗
P	0.341	0.301	0.481∗	0.442	0.297	0.024	0.258	-0.132
K	0.647∗∗	0.606∗∗	0.146	0.560∗	0.641∗	0.585∗	0.238
Cu	0.664∗∗	0.746∗∗	0.035	0.480∗	0.651∗∗	0.255
Zn	0.439	0.424	0.093	0.608∗∗	0.408
Cr	0.928∗∗	0.928∗∗	0.266	0.725∗∗
Mn	0.839∗∗	0.732∗∗	0.167
pH	0.255	0.207
Water content	0.926∗∗

^∗∗Means the correlation is significant at the p < 0.01 level. ^∗Means the correlation is significant at the p < 0.05 level.