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| Impact of land use on non-point sources of phosphorus in the Yong River Basin: SWAT model analysis |
| Received:June 29, 2018 |
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| KeyWord:land use type;non-point source pollution;SWAT model;phosphorus |
| Author Name | Affiliation | E-mail | | ZHANG Zhao-zhao | Department of Geography & Spatial Information Techniques, Ningbo University, Ningbo 315211, China
Institute of Eco-environmental Science, Ningbo University, Ningbo 315211, China | | | CHENG Jun-rui | Institute of Eco-environmental Science, Ningbo University, Ningbo 315211, China | | | BI Jun-peng | Department of Geography & Spatial Information Techniques, Ningbo University, Ningbo 315211, China
Institute of Eco-environmental Science, Ningbo University, Ningbo 315211, China | | | XU Yu-jie | Institute of Eco-environmental Science, Ningbo University, Ningbo 315211, China | | | LI Yun | Institute of Eco-environmental Science, Ningbo University, Ningbo 315211, China | | | WANG Kan | Institute of Eco-environmental Science, Ningbo University, Ningbo 315211, China | wangkan@nbu.edu.cn |
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| Abstract: |
| This study establishes a SWAT hydrology and water quality model from the year 2010 to 2014 for the Yong River Basin, investigating the impact of land use on the non-point source phosphorus pollution on a hydrological response unit scale. Results showed that the model well-simulated the impact of land-use types of non-point pollution, especially in large basins over long time scales. The average annual runoff depths of forest, urban lands, agricultural lands, and orchards in the Yong River Basin were 588.05, 729.52, 624.26, and 608.05 mm, respectively. The average annual sediment loads were 10.09, 0.90, 44.68, and 13.29 t·hm-2, respectively. The average annual total phosphorus loads were 1.42, 0.35, 9.81, and 1.82 kg·hm-2, respectively. The linear regression model showed that there were clear linear relationships among runoff depth, sediment loads, and total phosphorus loads for the different types of land uses. The determination coefficients (R2) of the linear regression model for the sediment load and the total phosphorus load (R2=0.83~0.88, P<0.001) were higher than those for the runoff depth and total phosphorus load (R2=0.63~0.68, P<0.001), indicating that sediment was the main cause for the nonpoint source phosphorus loss. The total phosphorus load demonstrated significant spatial variability under one land-use type. The phosphorus load of the forest at a slope grade of 6 was 6.90 times that at a slope grade of 2. The phosphorus load of RGd soil at slope grades of 2 and 6 were 1.15 and 1.42 times of that of ACu soil, respectively. |
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