Table 1. Phylogenetic diversity and structure of α-proteobacteria and γ-proteobacteria belowground communities in terms of Faith’s phylogenetic diversity (PD), Rao’s quadratic entropy (QE), Net Relatedness Index (NRI) and Nearest Taxon Index (NTI).

	α-proteobacteria			γ-proteobacteria
	R	RS	BS	R	RS	BS
PD	0.668	2.265	2.644	0.229	4.516	2.707
QE	0.057	0.060	0.074	0.031	0.103	0.061
NRI	4.201	−0.645	3.158	0.494	−2.690	8.789
NRI P-value	0.008	0.273	0.001	0.319	0.001	0.000
NTI	1.360	−0.911	−0.178	1.383	−0.097	2.995
NTI P-value	0.092	0.179	0.443	0.103	0.481	0.003

NRI and NTI are indicators of phylogenetic clustering or phylogenetic overdispersal inferred using PHYLOCOM. All indices are based on ultrametric trees constructed with BEAST program. More details are presented in main text. *P-value based on comparison of phylogenetic distance observed and that based on a 999 permutations of a null model. R = root endosphere, RS = rhizosphere soil, and BS = bulk soil.