Table 2.
Results of simultaneous autoregressive error (SAR) models for all environmental variables and the proportion of total, woody, and herbaceous samara species to total species.
| Z | Pseudo-R2 | AIC | Moran’s I | |
|---|---|---|---|---|
| All plants | ||||
| Sqrt(AP) | 2.34* | - | - | - |
| TS | 1.41* | - | - | - |
| MTCQ | 1.04 | - | - | - |
| MAT | 2.89** | - | - | - |
| ARI | 2.07* | - | - | - |
| Sqrt(PDQ) | −0.15 | - | - | - |
| - | - | 60.78 | 994 | −0.007 |
| Woody species | ||||
| Sqrt(AP) | 3.92*** | - | - | - |
| TS | 3.12** | - | - | - |
| MTCQ | 2.53* | - | - | - |
| PDQ | −0.78 | - | - | - |
| ARI | 1.81* | - | - | - |
| - | - | 60.48 | 985 | −0.009 |
| Herbaceous species | ||||
| MAT | 4.17*** | - | - | - |
| TS | 3.06** | - | - | - |
| MDR | −4.41*** | - | - | - |
| MTCQ | 2.16* | - | - | - |
| Sqrt(AP) | −1.03 | - | - | - |
| - | - | 39.84 | 1,015 | −0.003 |
***p < 0.001, **0.001 < p < 0.01, *0.01 < p < 0.05.
The proportion of samara species was log-transformed for the analysis. All the p-values of the Moran’s I tests for the SAR models were greater than 0.1. AP, mean annual precipitation (was square-root transformed in the analysis). 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; pseudo-R2, the squared Pearson correlation coefficient comparing the observed and predicted proportions of samara species using full models; ‘-’, no value. Significance was determined using Student’s t-test (α = 0.05).