Vertical distribution patterns and drivers of soil bacterial communities across the continuous permafrost region of northeastern China

Ecological Processes

Table 2 Correlation matrix for microbial richness and environmental variables as revealed by Spearman Correlation analysis

	SDI	PDI	Temperature	Moisture	Salinity	TC	TN	TP	C/N	TOC	AN	AP	pH	Clay	Silt	Sand
SDI	1.000
PDI	0.936^**	1.000
Temperature	0.619^**	0.499^**	1.000
Moisture	−0.216^*	−0.105	−0.563^**	1.000
Salinity	−0.218^*	−0.158	−0.016	−0.126	1.000
TC	0.532^**	0.477^**	0.636^**	−0.198	−0.229^*	1.000
TN	0.530^**	0.474^**	0.638^**	−0.278^**	−0.131	0.937^**	1.000
TP	0.414^**	0.355^**	0.382^**	−0.175	−0.240^*	0.342^**	0.308^**	1.000
C/N	0.059	0.046	0.015	0.151	−0.507^**	0.182	−0.114	0.012	1.000
TOC	0.099	−0.009	0.039	−0.150	−0.165	0.246^*	0.183	0.149	0.149	1.000
AN	0.280^**	0.246^*	0.300^**	−0.150	−0.005	0.493^**	0.588^**	0.163	−0.338^**	−0.044	1.000
AP	−0.119	−0.129	−0.227^*	0.265^*	−0.028	−0.322^**	−0.364^**	0.269^*	0.045	−0.017	−0.382^**	1.000
pH	0.168	0.211^*	0.249^*	−0.234^*	0.399^**	0.145	0.268^*	−0.126	−0.457^**	−0.294^**	0.470^**	−0.450^**	1.000
Clay	−0.278^**	−0.296^**	−0.222^*	0.220^*	−0.047	−0.478^**	−0.582^**	−0.035	0.232^*	−0.093	−0.494^**	0.659^**	−0.445^**	1.000
Silt	−0.281^**	−0.282^**	−0.207	0.272^*	0.007	−0.377^**	−0.484^**	−0.022	0.148	−0.097	−0.392^**	0.634^**	−0.340^**	0.944^**	1.000
Sand	0.281^**	0.283^**	0.210^*	−0.270^*	−0.003	0.388^**	0.497^**	0.023	−0.160	0.093	0.407^**	−0.641^**	0.356^**	−0.955^**	−0.999^**	1.000

^*Significant at P < 0.05. **: Significant at P < 0.01
SDI, Shannon diversity index; PDI, Phylogenetic diversity index; TC, soil total carbon; TN, soil total nitrogen; TP, soil total phosphorus; C/N, soil C:N; TOC: soil total organic carbon; AN, soil available nitrogen; AP, soil available phosphorus