Table 3.

A Monte Carlo permutation test of relationship between environmental factors and bacterial community composition.

	RDA1	RDA2	r2	P-value
Water content	0.973405	0.229093	0.9413	0.003ˆ**
Organic C	0.982851	0.184403	0.4908	0.026ˆ*
Organic N	0.982232	0.187672	0.4737	0.027ˆ*
pH	-0.903472	-0.428648	0.9708	0.001ˆ***
${\mathrm{NH}}_{\mathrm{4}}^{\mathrm{+}}$-N	0.995426	0.095536	0.9114	0.010ˆ**
${\mathrm{SiO}}_{\mathrm{4}}^{\mathrm{2-}}$-Si	0.999743	-0.022681	0.8698	0.003ˆ**
${\mathrm{NO}}_{\mathrm{2}}^{\mathrm{-}}$-N	-0.994949	0.100383	0.7339	0.011ˆ*
${\mathrm{PO}}_{\mathrm{4}}^{\mathrm{3-}}$-P	0.981501	0.191459	0.2583	0.339
${\mathrm{NO}}_{\mathrm{3}}^{\mathrm{-}}$-N	-0.932998	0.359882	0.3111	0.147

^∗Correlation is significant at the 0.05 level.

^∗∗Correlation is significant at the 0.01 level.

^∗∗∗Correlation is significant at the 0.001 level.

P-values based on 999 permutations.