Table 2.
Final model resulting from stepwise forward and backward manually controlled selection of variables
| Variable | Estimate | S.E. | z value | Pr(>|z|) | Null deviance | Residual deviance | AIC | Pseudo- R2 |
|---|---|---|---|---|---|---|---|---|
| Beef cattle herd density | 3.497587 | 1.154833 | 3.029 | 0.002456 ** | 1073.59 | 942.64 | 968.64 | 0.158 |
| SC 312 Coniferous forest | -0.021672 | 0.004828 | -4.489 | 7.16e-06 *** | ||||
| tem_Q2 | 0.654361 | 0.616575 | 1.061 | 0.28856 | ||||
| pre_Q1 | 0.01539 | 0.008364 | 1.84 | 0.06578 | ||||
| pre_Q2 | 0.010399 | 0.006033 | 1.724 | 0.08475 | ||||
| pre_Q3 | -0.013316 | 0.006199 | -2.148 | 0.03170 * | ||||
| pre_Q4 | -0.008192 | 0.007002 | -1.17 | 0.24199 | ||||
| Soil type (ref. PZha, Haplic Podzol) | ||||||||
| ARha (Haplic Arenosol) | 0.600641 | 0.39866 | 1.507 | 0.131901 | ||||
| CMca (Calcaric Cambisol) | -0.472288 | 0.601682 | -0.785 | 0.432485 | ||||
| CMdy (Dystric Cambisol) | -0.932676 | 0.321899 | -2.897 | 0.003763 ** | ||||
| CMeu (Eutric Cambisol) | -0.626826 | 0.34534 | -1.815 | 0.069509 | ||||
| LPdy (Dystric Leptosol) | 1.180656 | 0.340213 | 3.47 | 0.000520 *** | ||||
| RGca (Calcaric Regosol) | -0.086256 | 0.284393 | -0.303 | 0.761662 | ||||
| RGdy (Dystric Regosol) | -0.020017 | 0.006052 | -3.307 | 0.000942 *** | ||||
| Fe (Iron) | 0.580659 | 0.163602 | 3.549 | 0.000386 *** | ||||
| P (Phosphorus) | -5.443749 | 1.601878 | -3.398 | 0.000678 *** | ||||
| Cu (Copper) | -0.051398 | 0.018112 | -2.838 | 0.004542 ** |
* Significant at 0.05 level; ** Significant at 0.01 level; *** Significant at 0.001 level
AIC: Akaike’s Information Criterion