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| Crops land | Grass land | Forest land | Water | residential and build-up land | ||
| visual interpretation land cover of 2005 | area(km2) | 425.7 | 2.1 | 14.3 | 110.3 | 117.9 |
| proportion(%) | 63.5 | 0.3 | 2.1 | 16.5 | 17.6 | |
| visual interpretation land cover of 2009 | area(km2) | 391.2 | 2.1 | 26.7 | 108.6 | 141.0 |
| proportion(%) | 58.4 | 0.3 | 4.0 | 16.2 | 21.1 | |
| Land cover of new method | area(km2) | 360.9 | 3.0 | 29.9 | 113.8 | 163.0 |
| proportion(%) | 53.8 | 0.4 | 4.5 | 17.0 | 24.3 |
