| Category | θSlope range | Winter | Summer | Autumn | |||
Area Km2 | % | Area Km² | % | Area Km2 | % | |||
1 | Significant degradation | θ < −0.035 | 21,307.1 | 0.9 | 23439.6 | 0.9 | 128506.4 | 5.1 |
2 | Moderate degradation | −0.035 < θ > −0.025 | 24,978.6 | 1.0 | 34998.9 | 1.4 | 112684.1 | 4.5 |
3 | Mild degradation | −0.025 < θ > −0.015 | 58,275.7 | 2.3 | 72830.1 | 2.9 | 192501.9 | 7.7 |
4 | No change | −0.015 < θ > 0.015 | 2,020,584.8 | 80.8 | 2014143.7 | 80.5 | 1782067.7 | 71.3 |
5 | Mild improvement | 0.015 < θ > 0.025 | 210,813.6 | 8.4 | 144869.6 | 5.8 | 134926.4 | 5.4 |
6 | Moderate improvement | 0.025 < θ > 0.035 | 110,011.8 | 4.4 | 128752.2 | 5.1 | 100675.8 | 4.0 |
7 | Significant improvement | θ > 0.03 | 55,038.6 | 2.2 | 81975.8 | 3.3 | 49647.8 | 2.0 |
| Total |
| 2,501,010 | 100 | 2501010 | 100 | 2501010 | 100 |