Table 1. Explanatory power (R²) of the predictors for Salix species diversity with a spatial resolution of 100 × 100 km evaluated by general linear models in the whole study region, mountains and lowlands seperately.

	Whole region	Mountains	Lowlands
Modern climate
MAT	8.2% (−)*	2.5% (−)	31.9% (−)**
MTCQ	7.4% (−)	2.4% (−)	33.8% (−)***
MTDQ	15.3% (−)**	6.3% (−)*	44.4% (−)***
PET	7.2% (−)*	2.8% (−)	32.5% (−)***
MAP	1.0% (+)	3.1% (+)	0.5% (+)
RAIN	1.0% (+)	2.5% (+)	2.4% (+)
PDQ	1.0% (+)	0.2% (+)	0.2% (+)
AET	1.8% (+)	4.8% (+)***	0.2% (+)
Historical Climate change
MAT Anomaly	0.9% (+)	0.1% (+)	15.5% (+)**
MAP Anomaly	5.0% (+)*	8.4% (+)***	6.8% (+)
Habitat heterogeneity
Mean slope	22.7% (+)***	19.3% (+)***	10.3% (+)
Elevation range	15.6% (+)***	9.7% (+)***	6.1% (+)

Modified-T tests were used to test the significance. *P < 0.05, **P < 0.01, ***P < 0.001.