Table 3.
Results of the multiple regressions on distance matrices (MRM) for species compositions of different functional fungi in the desert, grassland and whole region.
| Trophic groups | Variable retained in the model and its individual contribution (%) | Model R2 | Model P | |
|---|---|---|---|---|
| Whole | Total fungi | Geographic distance (8.6), Plant dissimilarity (7.8), | 0.585 | <0.0001 |
| Plant coverage (7.9), CN (8.4), pH (6.3), MAP (19.5) | ||||
| Arbuscular mycorrhiza | Geographic distance | 0.042 | <0.0001 | |
| Saprotroph | Geographic distance (6.8), Plant dissimilarity (4.8), | 0.491 | <0.0001 | |
| Plant coverage (7.5), CN (8.4), pH (5.8), MAP (15.8) | ||||
| Pathotroph | Geographic distance (3.6), Plant dissimilarity (9.5), | 0.425 | <0.0001 | |
| Plant species richness (4.6), SM (10), MAP (14.9) | ||||
| Desert | Total fungi | Geographic distance (16.2), TSN (3.4), CN (18.1), pH (6.2), MAT (7.1) | 0.509 | <0.0001 |
| Arbuscular mycorrhiza | No variable retained in the final model | |||
| Saprotroph | Geographic distance (10.4), CN (14.9), pH (5.3), MAT (8.3) | 0.387 | <0.0001 | |
| Pathotroph | Geographic distance (6.6), Plant dissimilarity (8.5) | 0.151 | <0.0001 | |
| Grassland | Total fungi | Plant dissimilarity (8.5), Plant coverage (6.5), MAP (27.7) | 0.427 | <0.0001 |
| Arbuscular mycorrhiza | MAP | 0.119 | <0.001 | |
| Saprotroph | Plant coverage (6.5), MAP (30.5) | 0.369 | <0.0001 | |
| Pathotroph | Geographic distance (6.7), AN (10.8) | 0.175 | <0.0001 | |
MAP, mean annual precipitation; MAT, mean annual temperature; SM, soil moisture content; TSN, soil total nitrogen; TOC, soil total organic carbon; AN, soil available nitrogen; CN, soil carbon: nitrogen ratio. Geographic distance was log-transformed.