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    华北土石山区砾石覆盖对土壤溅蚀的影响

    Effects of gravel coverage on splash erosion in the mountainous region of northern China

    • 摘要: 为探讨降雨强度和砾石覆盖度与土壤溅蚀的关系,通过野外人工模拟降雨,采用自主设计的圆形溅蚀板定量研究不同砾石覆盖度(0、5%、10%、15%、20%)、不同降雨强度(40、80 和120 mm/ h)对土壤溅蚀量的影响。结果表明:在相同的砾石覆盖度下,溅蚀量与降雨强度成线性正相关;在相同降雨强度下,溅蚀量随砾石覆盖度的增加呈指数递减趋势;随着降雨强度的增大,土壤溅蚀量受砾石覆盖度影响的程度减小;土壤溅蚀量随溅蚀距离的增加先增大后减小;土粒飞溅距离与降雨强度呈正相关;砾石覆盖对抑制溅蚀具有重要影响。

       

      Abstract: To explore the relationship between rainfall intensity, gravel coverage and splash erosion amount, we analyzed the effect of different gravel coverages (0, 5%, 10%, 15%, 20%) on the splash erosion under different rainfall intensities (40 mm/ h, 80 mm/ h and 120 mm/ h) through artificial rainfall simulation and using a self鄄made round splash plate. The results showed that at the same gravel coverage, splash erosion amount had a linearly positive correlation with rainfall intensity. Under the same rainfall intensity, splash erosion amount exponentially decreasing with gravel coverage. With the increase of rainfall intensity, the amount of soil splash erosion affected by the gravel coverage would decrease. Soil splash erosion increased first with the increase of splash erosion distance and then decreased. The distance of splashed soil particles was positively correlated to rainfall intensity. Gravel coverage has considerable effects in inhibiting splash erosion.

       

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