TABLE 3.

Mantel and partial Mantel tests of soil bacterial β-diversity with environmental parameters.

Parameters	Surface layer		Subsurface layer		Deep layer
	Mantel	Partial Mantel	Mantel	Partial Mantel	Mantel	Partial Mantel
MAT	0.580*	0.393*	0.648**	0.433**	0.595*	0.524*
MAP	0.016	−0.047	0.272	0.239	0.212	−0.167
Div	−0.100	−0.01	0.136	−0.064	0.344*	0.346*
TD	−0.128	0.063	−0.149	−0.084	−0.313	−0.311
BA	0.346*	0.055	0.273	0.031	0.282	−0.146
SOC	0.115	−0.144	0.120	−0.232	0.291*	0.074
Mo:SOC	0.695*	0.424	0.260	0.024	0.591*	0.396
C:N	−0.108	0.057	0.067	0.063	0.193	−0.041
TN	0.298	0.026	0.179	0.263	0.204	−0.108
SIN	−0.096	0.069	−0.223	−0.236	0.157	−0.317
POC%	−0.020	−0.123	0.072	0.224	0.454*	0.163
RP%	0.484*	0.153	0.006	−0.018	0.028	0.263
LPI%	0.577*	0.081	0.018	−0.006	−0.055	−0.317
LPII%	−0.047	0.07	−0.041	0.172	0.089	0.285
pH	0.630*	0.708*	0.482**	0.592**	0.504*	0.218
Clay	−0.139	−0.071	−0.071	−0.145	0.028	0.238
Sand	−0.109	0.121	−0.084	0.123	−0.025	−0.04

Dissimilarity matrices of environmental characteristics were calculated based on Euclidean distances. β-Diversity of bacterial community was calculated based on weighted UniFrac distances. Numbers in bold indicate significant relationships at p < 0.1. *p < 0.05; **p < 0.01. p-Values were corrected for multiple testing using the Benjamini and Hochberg method. MAT, mean annual temperature; MAP, mean annual precipitation; Div, Shannon’s index of trees; BA, the sum of breast-height basal areas of trees; TD, tree density; SIN, soil inorganic nitrogen (NH₄⁺ + NO₃^–); POC%, proportion of particulate organic carbon in SOC; LPI%, proportion of labile carbon I in SOC; LPII%, proportion of labile carbon II in SOC; RP% proportion of recalcitrant carbon in SOC; M_o:SOC, mole ratio of poorly crystallized Fe and Al to SOC.