Table 2.

Spearman correlation coefficients of Mantel tests assess spatial structure in each edaphic property and each aspect of microbial community structure.

Scale	Location	pH	EC	Composition	Richness
Regional		0.50***	0.10**	0.44***	0.03*
Basin	Bonney	0.01	-0.01	0.28***	NS
	Hoare	0.10*	0.10*	0.13*	NS
	Fryxell	0.04	0.03	-0.01	0.14**
Local	B_1	0.83*	0.06	-0.17	0.38
	B_2	ND	ND	ND	ND
	B_3	ND	ND	ND	ND
	B_4	ND	ND	ND	ND
	B_5	0.84*	-0.03	-0.22	-0.61
	B_6	0.08	0.75**	0.27	0.02
	B_7	0.75*	-0.27	0.13	-0.23
	B_8	0.03	0.03	0.60	0.77*
	H_1	0.41	0.11	0.72*	0.42
	H_2	-0.05	0.64**	0.05	-0.06
	H_3	0.09	-0.09	0.14	0.77
	H_4	-0.17	-0.26	0.17	-0.18
	H_5	0.58*	0.86*	0.64*	-0.01
	H_6	0.20	0.71	0.83	-0.35
	H_7	0.06	-0.43	0.26	0.89*
	H_8	-0.17	-0.03	0.07	0.01
	F_1	0.12	0.92**	0.37	0.92**
	F_2	-0.20	0.99*	0.70*	0.84*
	F_3	0.22	-0.32	0.35	0.46*
	F_4	0.71*	0.03	0.02	0.11
	F_5	0.20	0.38*	-0.18	0.42*
	F_6	0.01	-0.26	0.41	-0.05
	F_7	0.22	-0.30	0.56	0.59*
	F_8	0.05	0.27	0.12	0.35

Local scale key indicates basin_polygon number. ^∗P ≤ 0.1, ^∗∗P ≤ 0.01, ^∗∗∗P ≤ 0.001, ND, not determined due to small sample size.