Table 1. P-values for ANOVA for microbial richness, Shannon’s H’ and evenness and PERMANOVA for Bray-Curtis dissimilarity.

Hypothesis	Source of variation	Richness	Shannon’s H’	Evenness	Community Composition*
1a: Whole soil within year, June, July, August 2011	CS	0.839	0.753	0.800	0.644
	LP	<0.001	<0.001	<0.001	0.006
	Month	0.029	0.136	0.240	0.836
	LP x CS	NS	NS	NS	NS
	LP x Month	NS	NS	NS	NS
	CS x Month	NS	NS	NS	NS
	LP x CS x Month	NS	NS	NS	NS
1b: Whole soil between years, July 2011 & 2012	CS	0.014	0.073	0.177	0.592
	LP	<0.001	<0.001	0.001	0.012
	Year	0.206	0.514	0.752	0.663
	LP x CS	NS	NS	NS	NS
	LP x Year	NS	NS	NS	NS
	CS x Year	NS	NS	NS	NS
	LP x CS x Year	NS	NS	NS	NS
2: Whole or rhizosphere soil, July 2012	CS	0.007	<0.001	<0.001	0.268
	LP	<0.001	<0.001	<0.001	0.011
	Soil origin	0.002	0.070	0.620	0.184
	LP x CS	NS	NS	NS	NS
	LP x Soil origin	NS	NS	NS	NS
	CS x Soil origin	NS	NS	NS	NS
	LP x CS x Soil origin	NS	NS	NS	NS

LP, topographic position; CS,cropping System; NS, non-signification interaction terms at α > 0.1 and terms were removed from the model

*Community composition evaluated from Bray-Curtis dissimilarity matrices based on OTU abundances.