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| Response of soil erosion and phosphorus losses to individual rainfall under different land uses at Karst slopes |
| Received:September 29, 2017 |
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| KeyWord:Karst area;land uses;individual rainfall;soil erosion;phosphorus |
| Author Name | Affiliation | E-mail | | PENG Hong-jia | Key Laboratory of Karst Environment and Geohazard, Ministry of Land and Resources, Guizhou University, Guiyang 550025, China | | | WU Qi-xin | Key Laboratory of Karst Environment and Geohazard, Ministry of Land and Resources, Guizhou University, Guiyang 550025, China
College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | wuqixin03@163.com | | REN Fei-peng | Changjiang River Scientific Research Institute of Changjiang Water Resources Commission, Wuhan 430010, China | feipengren2006@mail.bnu.edu.cn | | AN Yan-ling | Guizhou Institute of Technology, Guiyang 550003, China | | | FU Yu-wen | Guizhou Provincial Monitoring Station of Soil and Water Conservation, Guiyang 550002, China | | | LIU Rui-lu | Guizhou Provincial Monitoring Station of Soil and Water Conservation, Guiyang 550002, China | | | LÜ Jie-mei | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | |
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| Abstract: |
| In order to understand the response of soil erosion and phosphorus losses to individual rainfall under different land uses at Karst slopes, water and sediment samples were collected from different Karst slopes. These samples comprised conservation forest, farmland, natural meadow, bare land, and economic fruit forest land uses. The results indicated that the descending order of runoff coefficients for the five land-use types were as follows:bare land > natural meadow > farmland > conservation forest > economic fruit forest. The sediment yield and phosphorus losses per unit area were(in descending order) as follows:farmland > bare land > economic fruit forest > conservation forest > natural meadow. Under large rainfall and high-intensity rainfall conditions, runoff coefficients, sediment yield per unit area, and phosphorus losses per unit area of farmland and bare land increased sharply. Rain intensity was a significant factor that affected soil erosion and phosphorus losses, which fitted well with the amount of soil erosion. Particulate phosphorus(PP) was the main loss of total phosphorus(TP), ranging from 75.47% to 97.91%. Farmland runoff[0.73 mg·L-1 < ρ(TP) < 2.49 mg·L-1], bare land runoff[0.10 mg·L-1 < ρ(TP) < 0.50 mg·L-1] and economic fruit forest runoff[0.13 mg·L-1 < ρ(TP) < 0.46 mg·L-1] could lead to phosphorus loadings increasing in receiving waters, while that of natural meadow runoff[0.03 mg·L-1 < ρ(TP) < 0.09 mg·L-1] had minor impacts on pollutant loadings in receiving waters. Soil erosion and phosphorus losses correlated strongly with precipitation processes and land uses, suggesting that land-use structure optimization and human disturbance reduction could be an effective method to mitigate soil erosion and non-point source pollution. |
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