Table 4. Loading, eigenvalue and variance explained of principal component analysis (PCA) using eighteen soil properties.
| Soil quality indicators | PC1 | PC2 |
|---|---|---|
| pH | 0.859 | −0.119 |
| SOM | 0.977 | −0.018 |
| TN | 0.968 | −0.132 |
| TP | 0.953 | −0.106 |
| TK | 0.778 | −0.415 |
| AN | 0.979 | −0.159 |
| AP | 0.977 | −0.066 |
| AK | 0.950 | −0.175 |
| MBC | 0.923 | 0.059 |
| MBN | 0.923 | 0.061 |
| Bacteria | 0.883 | 0.445 |
| Fungi | 0.906 | 0.398 |
| Actinomycetes | 0.862 | 0.457 |
| AMF | 0.920 | 0.352 |
| Total PLFA | 0.886 | 0.444 |
| M | 0.907 | −0.386 |
| Microaggregate | −0.848 | 0.392 |
| Silt + clay | −0.793 | 0.296 |
| Eigenvalue | 14.806 | 1.559 |
| Explained variance (%) | 82.253 | 8.664 |
| Cumulative variance (%) | 82.253 | 90.917 |
Notes.
Boldface factor loadings are considered highly weighted. Boldface and underlined loadings correspond to the indicators retained in the MDS.
- SOM
- soil organic matter
- TN
- total nitrogen
- TP
- total phosphorus
- TK
- total potassium
- AN
- available nitrogen
- AP
- available phosphorus
- AK
- available potassium
- MBC
- microbial biomass carbon
- MBN
- microbial biomass nitrogen
- AMF
- arbuscular mycorrhizae fungi
- M
- large macroaggregate + small macroaggregate