Table 2. Simple Mantel test demonstrating the correlations of sediment environmental variations (Euclidean distance) and geographic distance with the variation in prokaryotic community composition (based on Bray-Curtis distance, 999 permutations).

	Simple		Controlled by	Partial
	r	P		r	P
Geo_distance	0.322	0.001	Temperature	0.274	0.003
Geo_distance	—	—	Silt	0.254	0.001
Geo_distance	—	—	Texture	0.256	0.002
Geo_distance	—	—	Clay	0.259	0.003
Geo_distance	—	—	AVS	0.311	0.002
Geo_distance	—	—	Env_distance	0.285	0.002
Geo_distance	—	—	Water_depth	0.307	0.002
Temperature	0.278	0.001	Geo_distance	0.220	0.002
Silt	0.271	0.003	Geo_distance	0.182	0.025
Texture	0.262	0.004	Geo_distance	0.172	0.035
Clay	0.256	0.001	Geo_distance	0.166	0.039
AVS	0.224	0.036	Geo_distance	0.207	0.042
Env_distance	0.208	0.027	Geo_distance	0.140	0.096
Water_depth	0.199	0.025	Geo_distance	0.173	0.039
Cd	0.175	0.068	Geo_distance	0.168	0.092
TOC	0.142	0.078	Geo_distance	0.063	0.243
TN	0.089	0.188	Geo_distance	0.084	0.211
MC	0.063	0.170	Geo_distance	−0.085	0.916
Cr	0.047	0.321	Geo_distance	0.044	0.318
pH	0.017	0.392	Geo_distance	0.019	0.388
TP	0.009	0.431	Geo_distance	0.029	0.348
As	0.001	0.486	Geo_distance	−0.010	0.542
Hg	−0.001	0.472	Geo_distance	0.014	0.416
Zn	−0.010	0.514	Geo_distance	0.034	0.343
Sand	−0.023	0.569	Geo_distance	−0.098	0.832
Pb	−0.045	0.689	Geo_distance	−0.061	0.740
Cu	−0.052	0.701	Geo_distance	−0.024	0.590

Partial Mantel test demonstrating the correlation of geographic distance with variation in community composition controlled by significantly correlative environmental variables obtained from simple Mantle tests and those of environmental variables controlled by geographic distance. Data in bold indicate significant correlations (P < 0.05). Geo_distance: geographic distance; env_distance: environmental distance (Euclidean distance); AVS: acid-volatile sulfide; TOC: total organic carbon; TN: total nitrogen; MC: moisture content; TP: total phosphorus.