Table 2. Variance partitioning of the AMF community matrix with the plant community also included as a predictor of the AMF community.

Source of variance	Phylogeny		Presence/absence
	Root	Soil	Root	Soil
Environment	0NS	0NS	3***	0NS
Space	30***	29***	19***	24***
Plants	0NS	0NS	4**	0NS
Env+space	4NT	3NT	11NT	5NT
Space+plants	0NT	6NT	11NT	10NT
Env+plants	0NT	0NT	0NT	0NT
Env+space+plants	3NT	3NT	0NT	2NT
Unexplained	63	59	52	54

Abbreviations: AMF, arbuscular mycorrhizal fungi; NS, not significant, NT, not testable.

The table is divided in two main blocks: phylogeny and presence/absence of plants. These blocks refer to how the effect of plants on AMF was evaluated. In the first two columns of results (phylogeny, root and soil), the effects of plants (row wise) is assessed by using plant phylogeny as a predictor of AMF. In the second two columns (presence/absence, root and soil), we used plant community structure as predictor of AMF. The other predictors were environment or env (soil properties) and space (geographic position). The plus sign in the Source of variance column stands for shared variation (it is not the sum of the variances explained by each predictor, for example, env+space is the spatially structured effect of the environment). Figures are percentage values of total variance. ***P<0.001; **P<0.01.