Table 1.
Results of multiple linear regression (OLS) models for all environmental variables and the proportion of total, woody, and herbaceous samara species to total species.
| t | VIF | Dev, % | AIC | Moran’s I | |
|---|---|---|---|---|---|
| All plants | |||||
| Sqrt(AP) | 14.66*** | 3.43 | - | - | - |
| TS | 16.44*** | 2.05 | - | - | - |
| MAT | 9.99*** | 2.26 | |||
| MTCQ | 5.42*** | 1.73 | - | - | - |
| Sqrt(PDQ) | −5.07*** | 3.17 | - | - | - |
| ARI | 3.22** | 1.52 | - | - | - |
| - | - | 46.91 | 1,271 | 0.219*** | |
| Woody species | |||||
| Sqrt(AP) | 18.75*** | 3.37 | - | - | - |
| TS | 18.51*** | 2.54 | - | - | - |
| Sqrt(PDQ) | −10.21*** | 3.05 | |||
| MTCQ | 8.19*** | 1.68 | |||
| ARI | 2.43** | 1.41 | - | - | - |
| - | - | 40.67 | 1,275 | 0.312*** | |
| Herbaceous species | |||||
| MAT | 8.74*** | 2.36 | - | - | - |
| TS | 9.92*** | 1.63 | - | - | - |
| MDR | −8.18*** | 3.66 | - | - | - |
| Sqrt(AP) | −3.97*** | 3.65 | - | - | - |
| MTCQ | 3.11** | 1.59 | - | - | - |
| - | - | 34.03 | 1,095 | 0.098*** | |
***p < 0.001, **0.001 < p < 0.01, *0.01 < p < 0.05.
AP, mean annual precipitation; MAT, mean annual temperature; TS, temperature seasonality; MTCQ, the temperature of the coldest quarter; MDR, mean diurnal range; ARI, relief degree of land surface; PDQ, precipitation of the driest quarter; unique-R2, differences between the R2 of full MLR models and that of MLR models without that predictor; VIF, variance inflation factor, used to evaluate the significance of multi-collinearity; Dev, percentage deviance explained by the models; ‘-’, no value. If VIF is greater than five, then multi-collinearity is considered significant. Significance was determined using Student’s t-test (α = 0.05).