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Significant physicochemical variables of the substrate and biotic parameters that explain the enzyme activity of hard coal mine spoil heaps.
| Variable | Explain % | Contribution % | p |
|---|---|---|---|
| WHC (%) | 8.6 | 15.7 | 0.012 |
| pH in KCl | 8.3 | 15.1 | 0.018 |
| Mg available (mg kg−1) | 5.8 | 10.6 | 0.010 |
| Biomass (g) | 5.3 | 9.7 | 0.022 |
| Moisture (%) | 5.1 | 9.3 | 0.032 |
| P available (mg P2O5 kg−1) | 4.9 | 9.0 | 0.038 |
| SOC (%) | 4.2 | 7.7 | 0.046 |
| Shannon–Wiener diversity index H′ | 3.3 | 6.1 | 0.058 |
