Table 4.
Principal components (PC) and component loadings related to physical, chemical, and biochemical properties determined in the different soils.
| PC1 | PC2 | PC3 | |
|---|---|---|---|
| TOC | 0.745* | 0.518 | 0.355 |
| THC | 0.892* | −0.175 | 0.184 |
| AHC | 0.892* | 0.007 | 0.281 |
| TN | 0.585 | 0.496 | 0.611 |
| EG | 0.762* | −0.005 | 0.402 |
| TG | 0.196 | 0.910* | −0.111 |
| WSC | 0.288 | −0.091 | 0.877* |
| DH-ase | 0.722* | 0.419 | 0.261 |
| B/E3s | 0.879* | 0.164 | −0.169 |
| N/Os | 0.101 | −0.710* | 0.233 |
| porosity | 0.057 | −0.331 | 0.822* |
| Var. Sp. | 4.498 | 2.196 | 2.382 |
| Prp. Tot. | 0.409 | 0.200 | 0.217 |
TOC: total organic carbon; THC: total humic carbon; AHC: active humic carbon; TN: total nitrogen; EG: extracellular β-glucosidase activity; TG: β-glucosidase activity; WSC: water soluble carbon; DH-ase: dehydrogenase activity; B/E3s: benzene/toluene whole soil; N/Os: furfural/pyrrole whole soil. Var. Sp.: explained variance; Prp. Tot.: total proportionality.
*Variables with component loadings used to interpret the PCs; threshold level: 0.7.