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| Processes and characteristics of erosion on hillslopes of granite red soil under simulated rainfall |
| Feng Xiu, Zha Han, Huang ShaoYan |
| Key Laboratory of Subtropical Resources and Environment,College of Geography Science,Fujian Normal University,350007,Fuzhou,China |
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Abstract The main objective of this study is to quantify the effects of rainfall intensity, slope and surface cover on the soil erosion processes on hillslopes of granite red soil through artificial rainfall simulation. The results show that: 1) the initial time producing runoff became earlier with the increase of rainfall intensity and slope degree, while surface cover on the slope would delay the initial time; 2) at different rainfall intensities and slope degrees, the runoff rate increased rapidly on the start of runoff generation, and reached stable in 7 -10 min; in addition, the runoff rate increased significantly with the increase of rainfall intensity and slope degree; 3) the sediment yield rate increased markedly with the increase of rainfall intensity, and the bigger the rainfall intensity was, the more obvious the effect of slope degree on the sediment yield rate was; 4) the rainfall intensity was positively related to the total runoff and total sediment with the correlation coefficients of 0.892 and 0.799, respectively; 5) surface cover played an important role in the reducton of sediment, and the contribution rate was more than 90%.
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Received: 30 August 2013
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