TABLE 4.

Pearson correlation coefficients between the NRI and NTI and environmental variables and between the βNTI and environmental distance for all samples^a

Index	pH	EC	TN	SOM	TP	Clay	Silt	Sand	MAP	MAT	NDVI
NRI	0.100	−0.134	−0.046	−0.035	0.077	−0.115	−0.140	0.139	0.068	0.159	0.032
NTI	−0.108	0.298*	0.033	0.111	0.324*	0.169	0.166	−0.173	0.341*	0.311*	0.280*
βNTI	−0.192***	−0.162***	0.036	−0.007	−0.142***	−0.071*	−0.127***	−0.114***	−0.234***	−0.081**	−0.233***

^aAsterisks represent significance of correlation (*, P < 0.05; **, P < 0.01; ***, P < 0.001). For abbreviations, see Table 1.