Table 4.

Relationship between the relative abundance of OTUs and variables as tested by Mantel analysis.

Variables	Bulk		Rhizosphere
	R2	p	R2	p
pH	0.327	0.019 *	0.264	0.007 **
SOC	0.287	0.032 *	−0.040	0.611
TN	0.058	0.292	0.029	0.347
TP	−0.116	0.756	0.213	0.024 *
TK	0.351	0.009 **	0.335	0.001 **
AP	0.343	0.012 *	0.174	0.038 *
AK	0.472	0.001 **	0.195	0.035 *
${\mathrm{NO}}_3^{-}$-H	0.116	0.229	0.180	0.045 *
${\mathrm{NH}}_4^{+}$-H	0.090	0.260	−0.029	0.570
Catalase	0.344	0.011 *	0.015	0.361
Acid phosphatase	0.225	0.079	0.023	0.354
Urease	0.011	0.434	0.585	0.001 **

SOC: soil organic carbon; TN: total nitrogen; TP: total phosphorous; TK: total potassium; AP: available phosphorous; AK: available potassium; ${\mathrm{NO}}_3^{-}$-H: nitrate nitrogen; ${\mathrm{NH}}_4^{+}$-H: ammonium nitrogen. * p < 0.05; ** p < 0.01.