| 类别 | 级别差 | 级面积/km2 | 类面积/km2 | 类比例% |
| 变好 | −4 | 0.007 | 306.890 | 35.6 |
| −3 | 8.954 |
|
| |
| −2 | 43.394 |
|
| |
| −1 | 254.535 |
|
| |
| 不变 | 0 | 425.588 | 425.588 | 49.4 |
| 变差 | 1 | 94.246 | 129.284 | 15.0 |
| 2 | 27.052 |
|
| |
| 3 | 7.415 |
|
| |
| 4 | 0.571 |
|
|