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[1]SHEN Hong,ZHANG Wan-shun,PENG Hong.Research on Soil Erosion and Particulate Phosphorus Load of Non-Point Source Pollution in the Middle and Lower Reaches of the Hanjiang River Basin[J].Research of Soil and Water Conservation,2010,17(05):1-6.

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Research on Soil Erosion and Particulate Phosphorus Load of Non-Point Source Pollution in the Middle and Lower Reaches of the Hanjiang River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 17 Number of periods: 2010 05 Page number: 1-6 Column: Public date: 2010-10-20

Title:: Research on Soil Erosion and Particulate Phosphorus Load of Non-Point Source Pollution in the Middle and Lower Reaches of the Hanjiang River Basin

Author(s):: SHEN Hong^1,4, ZHANG Wan-shun², PENG Hong³; 1. College of Urban and Environment Science, Laboratory for Earth Surface Process, Peking University, Beijing 100871, China;
2. College of Resource and Environment Science, Wuhan University, Wuhan 430079, China;
3. College of Water Resource and Hydroelectric Engineering, Wuhan University, Wuhan 430072, China

Keywords:: GIS; USLE equation; soil erosion; particulate phosphorus load of non-point source pollution; the middle and lower reaches of the Hanjiang River

CLC:: S157;X522

DOI:: -

Abstract:: Taking the middle and lower reaches of the Hanjiang River basin as a case, considering the spatial heterogeneity within the watershed, we divided the study basin into sub-basin and regarded them as the basic units in the physical and chemical process. The Landsat TM images of 2007, DEM, soil data, meteorological data, hydrological data, as well as socio-economic data were used to construct the environment database. On this basis, ArcGIS 9.2 and Erdas 9.2 were used to calculate the rainfall erosivity factor, the soil erodibility factor, the terrain factor, the management factor as well as the conservation factor. Moreover, the USLE model and load export empirical equation were introduced to calculate the distribution of soil erosion and the phosphorus mean load. The results showed that the modulus of soil erosion was as high as 867.55 t/(km²·a), however, there was still 5.69% of the study area whose erosion modulus was greater than 2 500 t/(km²·a), as a result, the phosphorus load of non-point source pollution was up to 8 496.79 t/a. And the Nan River, Tangbai River, Man River had the most serious situation in soil erosion, the maximum unit load of them were up to 8.42 kg/(hm²·a). What’s more, Shenlongjia forest, Xiangfan and Baokang were the critical source areas of non-point source pollution. As a result, we could find that controlling the slope farming and reasonable fertilization were effective measures to reduce the non-point source pollution.

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