TABLE 2.

Variance partition analysis and Mantel test between microbial community variance and soil chemical factors

Factor	Bulk soil			Rhizosphere soil			Rhizoplane
	Explaineda (%)	Rb	P valueb	Explained (%)	R	P value	Explained (%)	R	P value
SOM	6.48	0.63	0.001	7.14	0.70	0.001	5.76	0.08	0.207
pH	6.65	0.77	0.001	6.48	0.78	0.001	9.43	0.00	0.456
TN	6.28	0.76	0.001	6.66	0.70	0.002	8.66	0.09	0.304
TP	6.82	0.17	0.109	7.99	0.10	0.187	6.56	0.14	0.263
TK	6.62	0.54	0.002	8.05	0.50	0.002	4.86	0.10	0.184
AP	6.96	0.58	0.001	6.31	0.60	0.002	11.59	−0.05	0.664
AK	7.11	0.13	0.152	6.52	0.20	0.076	7.53	−0.12	0.730
TN/TP	7.12	0.57	0.005	6.86	0.61	0.001	7.69	−0.03	0.371
TN/TK	7.04	0.70	0.001	7.39	0.69	0.001	6.10	0.04	0.279
TP/TK	6.89	0.20	0.094	8.00	0.23	0.059	6.31	−0.06	0.459
Residuals	32.03			28.60			25.51

^aProportion of variance that could be explained returned by variance partition analysis.

^bR and P values were returned by Mantel test. R values in bold means significantly correlated (P < 0.05, n = 12).