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Summary of land cover types between 1991 and 2013 (area unit: hectares).
| Time | Farmland | Forest | Built-up | Water | Aquaculture | Others |
|---|---|---|---|---|---|---|
| Year 1991 | 87,858.27 | 8974.62 | 13,646.88 | 34,832.97 | 7376.94 | 8740.89 |
| Percent | 54.42% | 5.56% | 8.45% | 21.58% | 4.57% | 5.41% |
| Year 2004 | 71,604.36 | 9193.95 | 18,870.84 | 32,990.40 | 19,871.28 | 8899.74 |
| Percent | 44.36% | 5.70% | 11.69% | 20.44% | 12.31% | 5.51% |
| Year 2013 | 61,694.55 | 14,535.99 | 27,503.01 | 28,726.02 | 21,615.57 | 7355.43 |
| Percent | 38.22% | 9.00% | 17.04% | 17.79% | 13.39% | 4.56% |
