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| Impacts of Slope on Nitrogen Losses from Red Soil in Tea Garden Under Simulated Rainfall |
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| KeyWord:Xin′anjiang River; red soil in tea garden; slope; simulated rainfall; nitrogen; losses |
| Author Name | Affiliation | | ZHAO Yue | Chinese Academy for Environment Planning, Beijing 100012, China | | LI Ze-li | College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | | LIU Mao-hui | College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | | QIAN Li-ping | College of Biology and Environmental Science, Huangshan University, Huangshan 245041, China | | SUN Yun | College of Biology and Environmental Science, Huangshan University, Huangshan 245041, China | | WANG Zhen | College of Biology and Environmental Science, Huangshan University, Huangshan 245041, China | | WANG Yu-qiu | College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China |
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| Abstract: |
| Slope plays important roles in nutrient losses from soils, especially under rainfall. A laboratory simulated rainfall experiment was conducted to investigate the characteristics of runoff and nitrogen losses from red soil in tea garden in Xin′anjiang River Basin under five slope gradients of 0°, 5°, 10°, 15° and 20°. Results showed that runoff occurred mainly as interflow. Nitrogen losses in surface runoff had initial flush effect after each raining event, whereas those in the interflow increased with raining time. Under all slope gradients, nitrogen losses were mainly through interflow. For the surface runoff, regression equation for nitrogen losses（y） and slopes（x） was y=1.03e0.06x-0.88 with R2=0.99** for total nitrogen, y=0.37e0.06x-0.36 with R2=0.98** for NO-3-N, and y=0.002x+0.004 with R2=0.94** for NH+4-N. For the interflow, that was y=-5.65e0.06x+30.49 with R2=0.91** for total N, y=-0.17e0.16x+14.92 with R2=0.98* for NO-3-N, and y=0.77e-0.18x+0.13 with R2=0.92* for NH+4-N. These equations indicated that with increasing slopes nitrogen losses increased in the surface runoff, but decreased in the interflow. |
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