| Experimental research on the influence of two cultivation practices on rainfall runoff- and （sandy and muddy） sediment-generating processes in purple soil environment |
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| 作者姓名： | XU Pei ;WANG Yukuan ;FU Bin |
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| 作者单位： | XU Pei1，2，WANG Yukuan1，and FU Bin1 1 Institute of Mountain Hazards and Environment，Chinese Academy of Sciences，Chengdu 610041，China 2 Graduate University of the Chinese Academy of Sciences，Beijing 100049，China |
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| 基金项目： | 国家重点基础研究发展规划(973计划)
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| 摘 要： | Rainfall simulations have been conducted to study the soil erosion process of purple soil in two cultivation practices---contour cultivation and downslope cultivation. Results showed that under the two cultivation practices, the surface runoff can be described by the logarithmic function formula. In the initial period of rainfall, the amount of runoff increased with the rainfall duration and 20 minutes later it became relatively constant. The changing process of soil erosion rate may be described by the logarithmic function formula. The erosion rate increased with the rainfall duration and 20 minutes later it also became constant. Under downslope cultivation condition, the soil erosion rate increased more significantly than that under contour cultivation condition in the case of gentle rainfall intensity, and there is no obvious difference in erosion rate for downslope cultivation and contour cultivation practices. However, with increasing rainfall intensity the soil erosion rate under the downslope cultivation condition could be more than 30 times that under the contour cultivation condition. But this kind of difference would be reduced to some extent in the case of heavy rain.
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| 关 键 词： | 降雨量模拟 土壤侵蚀 径流 等高线 |
| 收稿时间： | 2 September 2007 |
Experimental research on the influence of two cultivation practices on rainfall runoff-and (sandy and muddy) sediment-generating processes in purple soil environment |
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| XU Pei,;WANG Yukuan,;FU Bin.Experimental research on the influence of two cultivation practices on rainfall runoff-and (sandy and muddy) sediment-generating processes in purple soil environment[J].Chinese Journal of Geochemistry,2008,27(4):370-376. |
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| Authors: | Pei Xu Yukuan Wang Bin Fu |
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| Institution: | [1]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China [2]Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Rainfall simulations have been conducted to study the soil erosion process of purple soil in two cultivation practices-contour cultivation and downslope cultivation. Results showed that under the two cultivation practices, the surface runoff can be described by the logarithmic function formula. In the initial period of rainfall, the amount of runoff increased with the rainfall duration and 20 minutes later it became relatively constant. The changing process of soil erosion rate may be described by the logarithmic function formula. The erosion rate increased with the rainfall duration and 20 minutes later it also became constant. Under downslope cultivation condition, the soil erosion rate increased more significantly than that under contour cultivation condition in the case of of gentle rainfall intensity, and there is no obvious difference in erosion rate for downslope cultivation and contour cultivation practices. However, with increasing rainfall intensity the soil erosion rate under the downslope cultivation condition could be more than 30 times that under the contour cultivation condition. But this kind of difference would be reduced to some extent in the case of heavy rain. |
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| Keywords: | rainfall simulation contour cultivation and downslope cultivation runoff and sediment generation soil erosion rate |
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