Table 1.
Results of stepwise multiple regression (SMR) for the effects of climatic factors and soil variables (MAT, MAP, PET, AI, soil nutrient levels and ratio) on foliar NRE, PRE, and NRE:PRE in global.
| Element resorption efficiency | Adj R2 full model | Partial regression coefficient |
Contribution of predictor (%) |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| MAT | MAP | PET | AI | Soil | MAT | MAP | PET | AI | Soil | ||
| GRAMINOID | |||||||||||
| NRE | 0.168 | −0.005a | >-0.001c | – | −0.091a | >-0.002c | 27.6 | 36.3 | – | 8.3 | 27.8 |
| PRE | 0.240 | −0.011c | >−0.003c | <−0.001c | 0.244c | – | 39.9 | 29.9 | 15.4 | 14.8 | – |
| NRE:PRE | 0.251 | 0.012b | – | −0.003c | −0.094a | −0.027c | 12.4 | – | 36.6 | 4.4 | 46.8 |
| FORB | |||||||||||
| NRE | 0.126 | 0.014c | – | <−0.003c | −0.190c | – | 16.4 | – | 17.5 | 66.1 | – |
| PRE | 0.178 | 0.019c | >−0.002c | >−0.003 | 0.236b | >−0.002b | 18.1 | 20.6 | 23.4 | 20.2 | 17.7 |
| NRE:PRE | 0.176 | – | – | >−0.001c | −0.075c | −0.004 | – | – | 43.2 | 52.4 | 4.4 |
| ALL | |||||||||||
| NRE | 0.102 | – | >−0.001c | >−0.001 | – | >−0.001b | – | 60.2 | 10.9 | – | 28.9 |
| PRE | 0.096 | – | >−0.001c | – | 0.126c | >−0.001a | – | 40.4 | – | 30.9 | 31.4 |
| NRE:PRE | 0.162 | – | – | >−0.001c | −0.048b | −0.011c | – | – | 47.7 | 20.5 | 31.8 |
a, b, and c denote significance at the 0.05, 0.01, 0.001 test level, respectively.