Table 3.
Results of principal component analysis, factor loadings, common factor variance, and indicators’ weight.
| Soil properties | PC1 | PC2 | Common factor variance | Weights |
|---|---|---|---|---|
| SD | -0.904 | 0.077 | 0.824 | 0.162 |
| SP | 0.905 | -0.077 | 0.825 | 0.163 |
| pH | -0.229 | 0.844 | 0.765 | 0.151 |
| SOM | 0.900 | -0.030 | 0.810 | 0.160 |
| STN | 0.935 | 0.087 | 0.882 | 0.174 |
| STP | 0.680 | 0.484 | 0.697 | 0.137 |
| STK | -0.100 | 0.509 | 0.269 | 0.053 |
| Eigen values | 3.846 | 1.226 | ||
| Variance contribution | 54.937% | 17.508% | ||
| Cumulative variance contribution | 54.937% | 72.445% |
SD, soil bulk density; SP, soil porosity; pH, pH value; SOM, soil organic matter; STN, soil total nitrogen; STP, soil total phosphorus; STK, soil total potassium.