Table 2 Principal component analysis of soil quality indicators, including rotated factor loadings, communalities, and assigned weights.
Soil quality indicators | Abbr. | PC1 | PC2 | PC3 | Communality | Weight | |
|---|---|---|---|---|---|---|---|
Physical properties | Soil bulk density | SBD | 0.736 | − 0.318 | − 0.247 | 0.704 | 0.081 |
Sand content | Sand | − 0.882 | 0.405 | − 0.130 | 0.960 | 0.111 | |
Silt content | Silt | 0.828 | − 0.426 | 0.044 | 0.869 | 0.100 | |
Clay content | Clay | 0.703 | − 0.211 | 0.295 | 0.626 | 0.072 | |
Total soil porosity | TSP | 0.053 | 0.628 | − 0.463 | 0.611 | 0.070 | |
Chemical properties | pH value | pH | 0.126 | 0.525 | 0.751 | 0.857 | 0.099 |
Soil organic matter (0–10 cm) | SOM | − 0.641 | 0.552 | 0.112 | 0.729 | 0.084 | |
Total nitrogen | TN | 0.550 | 0.420 | − 0.563 | 0.796 | 0.092 | |
Total phosphorus | TP | 0.659 | 0.558 | − 0.029 | 0.747 | 0.086 | |
Available nitrogen | AN | 0.868 | 0.410 | − 0.027 | 0.921 | 0.106 | |
Available phosphorus | AP | 0.675 | 0.582 | 0.262 | 0.863 | 0.099 | |
