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| DOI：10.13522/j.cnki.ggps.2016.0221 |
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| Nonpoint Source Pollution in Fuxin River Basin Investigated Using the SWAT Model |
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SONG Lanlan, HAO Qingqing, WANG Wenhai
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College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China；Jiangsu Province Hydrology and Water Resources Investigation Xuzhou Administration Bureau, Xuzhou 221006, China
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| Abstract: |
| 【Objective】 The leaching of nitrogen and phosphorus threatens the Fuxin River Basin and the purpose of this paper is to analyze the pollution. 【Method】 We used the SWAT model by calibrating and verifying it against measured runoff and water quality data from 1996 to 2009. The loss of nitrogen and phosphorus, as well as pollution load caused by farmland, livestock, orchard, and urban and rural areas were calculated under different land usages. 【Resuls】 The total nitrogen and phosphorous load was 13.8~15.1 kg/（hm2·a） and 0.32~0.51 kg/（hm2·a） respectively. The mass of the total nitrogen loss decreased in the order of irrigation land＞dryland＞livestock, while the mass of the total phosphorus loss decreased in the order of urban area＞irrigation land＞dryland. The livestock, accounting for only 1/33 of the orchard area, leached almost the same nitrogen and phosphorus as the irrigatied area. Of the total lost nitrogen and phosphorus, approximately 3% and 19% respectively entered the river, and 16.9% and 0.59% respectively were absorbed and retained by the forest. The retention time of the nitrogen and phosphorous in the forest was shorter than their lost rate from the dryland and irrigated land to the river. 【Conclusios】 Constructing vegetation filtering strips to halt nitrogen and phosphorus loss has only limited effect, and improving management to reduce their anthropogenic input into the basin is the key to control non-point source pollution. |
| Key words: non-point source pollution; land use; unit pollution load; Fuxin River Basin; SWAT |
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