Table 2.

Stepwise multiple regressions of the species richness of different functional fungi with environmental variables in the desert, grassland and the whole region.

	Trophic group	Variable retained in the model and its individual contribution (%)	Model R2adj	Model P
Whole	Total fungi	TSN (13.8), TOC2 (12.2), Plant species richness (16.1)	0.391	<0.0001
	Arbuscular mycorrhiza2	NP	0.276	<0.001
	Saprotroph	CN (11.8), MAP2 (11.9), Plant species richness (22.2)	0.431	<0.0001
	Pathotroph	CN (18.1), MAP2 (4.9), Plant species richness (18.2)	0.382	<0.0001
Desert	Total fungi	Plant species richness	0.184	<0.01
	Arbuscular mycorrhiza2	TSN	0.129	<0.05
	Saprotroph	CN (13.8), Plant species richness (19)	0.283	<0.01
	Pathotroph	CN (22.1), Plant species richness (20.8)	0.391	<0.001
Grassland	Total fungi	MAP	0.263	<0.001
	Arbuscular mycorrhiza1	CN	0.107	<0.05
	Saprotroph	MAP	0.286	<0.01
	Pathotroph	MAP	0.111	<0.05