Table 2. Results of stepwise multiple regression analyses.
| Pm |
Tm |
Ai |
||||
|---|---|---|---|---|---|---|
| Partial R2 | Probability | Partial R2 | Probability | Partial R2 | Probability | |
| Total C4 | 0.020 | 0.243 | 0.615 | 0.000 | 0.026 | 0.180 |
| Grass C4 | 0.506 | 0.000 | 0.031 | 0.176 | 0.002 | 0.710 |
| Sedge C4 | 0.002 | 0.703 | 0.647 | 0.000 | 0.023 | 0.170 |
| Chenop C4 | 0.027 | 0.006 | 0.000 | 0.945 | 0.882 | 0.000 |
Dependent variables: total C4, grass C4, sedge C4 and Chenop C4; Independent variables: mean annual precipitation (Pm), mean annual temperature (Tm) and arid index (Ai). The values of parameter estimate refer positive/ negative relationships between the examined dependent variable and the independent variables.