| Cite this article: | 石金昊,朱卫红,田乐,等.基于SWAT模型的布尔哈通河土地利用变化对面源污染的影响研究[J].灌溉排水学报,0,():-. |
| shijinhao,zhuweihong,tianle,et al.基于SWAT模型的布尔哈通河土地利用变化对面源污染的影响研究[J].灌溉排水学报,0,():-. |
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| Research on the Impact of Burhatong River Land Use Change on Non-point Source Pollution Based on SWAT Model |
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shijinhao1, zhuweihong1, tianle1, jinri2
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1.yanbian university;2.yanbian unniversity
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| Abstract: |
| 【Background】Non-point source pollution causes eutrophication and loss of biodiversity in rivers, lakes and other water bodies, and threatens people's water safety. Non-point source pollution in my country, especially agricultural non-point source pollution, has become an important water environmental problem. Changes in the composition pattern and spatial pattern of the watershed landscape will affect the generation, migration and transformation of non-point source pollutants.【Objective】To reveal the characteristics of spatio-temporal changes of source pollution under land use change, and to explore the relationship between watershed landscape pattern and non-point source pollution【Method】Taking the Burhatong River Basin as the research object, the distributed hydrological model SWAT was used to simulate the distribution characteristics of source pollution under the land use changes in the fourth period from 1986 to 2016, and the Fragstats 4.2 software was used to calculate the Burhatong River in 1986 and 2016. For the landscape pattern index of the sub-basin, the CANOCO5.0 software was used to analyze the relationship between the non-point source pollution in the sub-basin and the landscape index.【Result】(1) The determination coefficient R2 and the Nash efficiency coefficient NSE of the runoff and total phosphorus amount simulated by the SWAT model during the calibration period and the verification period are both above 0.6, and the model can well simulate the watershed water quality status, 1986 - 2016, the total annual phosphorus load simulated by SWAT was 74.04 tons, 73.78 tons, 82.50 tons and 128.31 tons. (2) There is a close relationship between non-point source pollution and landscape pattern. In terms of landscape composition pattern, forest land is negatively correlated with total phosphorus load, and farmland and construction land is positively correlated with total phosphorus load; in terms of landscape spatial pattern, the degree of forest land patch fragmentation is related to The total phosphorus load was positively correlated, while the degree of fragmentation of farmland patches was negatively correlated with the total phosphorus load. The higher the circulation and aggregation between the patches in the watershed have a positive effect on the improvement of nutrient loss, and the increase in landscape heterogeneity and the complexity of the shape in the watershed will lead to an increased risk of pollution load output.【Conclusion】The non-point source pollution load in the watershed increases sharply. The key control areas for non-point source pollution prevention are in the northern area with high slope and the eastern area where farmland and towns are concentrated.Prevent the increase of the fragmentation of forest plaques and control urban non-point source pollution sources, with a view to better improving the non-point source pollution situation in the basin. |
| Key words: SWAT model; Non-point source pollution; land use; landscape pattern; Redundancy analysis |
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