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| Spatial Distribution of Seasonal Adsorbed Phosphorus Load in Three Gorges Reservoir Area |
| Received:November 03, 2014 |
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| KeyWord:daily rainfall;adsorbed phosphorus load;soil erosion;spatial-temporal distribution |
| Author Name | Affiliation | | LONG Tian-yu | Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education, Chongqing University, Chongqing 400045, China
National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China | | WANG Hai-juan | Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education, Chongqing University, Chongqing 400045, China | | LIU Jia | Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education, Chongqing University, Chongqing 400045, China
National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China | | LIU Min | Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education, Chongqing University, Chongqing 400045, China |
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| Abstract: |
| Rainfall leads to soil erosion and non-point source pollution. The spatial distributions of seasonal and annual rainfall erosivity in the Three Gorges Reservoir Area were obtained by using the daily rainfall model and Kriging interpolation method. A spatial-temporal distribution model of adsorbed phosphorus load was then developed in combination of the Revised Universal Soil Loss Equation(RUSLE) and the loss coefficient with spatial inhomogeneity based on topographic index, and its rationality was verified. Then, the model was used to simulate the spatial distributions of seasonal and annual adsorbed phosphorus load from 2001 to 2010 in the Three Gorges Reservoir Area. Adsorbed phosphorus load showed obvious seasonal and spatial variations. The seasonal variation was consistent with rainfall erosivity, with the maximum in summer, the minimum in winter, and little difference in both spring and autumn. Spatially, adsorbed phosphorus loads were lower in Yiling, Chongqing, and the southwest Jiangjin, where the slopes are smaller and land use types are mainly woodland and urban and rural residential land, whereas higher in Wuxi, Kaixian, and Zigui districts, where the slopes are larger and land types are mainly paddy field, dryland and grassland. |
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