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通过野外人工模拟降雨试验,研究植被覆盖度对雨滴动能和土壤溅蚀量的影响。结果表明:(1)在相同植被覆盖度条件下,溅蚀量随雨强的增大而增大。植被覆盖度与植被拦截后雨滴的动能呈负指数函数关系;(2)相同降雨强度条件下,溅蚀量与植被覆盖度呈负相关,这一关系可用以e为底的指数函数来表示。溅蚀量随植被覆盖度的增大而减小,在植被覆盖度为40%前十分显著,可认为植被覆盖度40%是一个临界值;(3)在同一雨强相同植被覆盖度的情况下,溅蚀量随溅蚀距离的增大而减少,各溅蚀距离内的溅蚀量与植被覆盖度呈负相关。植被覆盖对溅蚀的影响随距离的增加而逐渐减弱。
Through field artificial rainfall experiment, the influence of vegetation coverage on kinetic energy of raindrops and soil erosion was studied. The results show that: (1) Under the same vegetation coverage, the amount of sputter erosion increases with the rainfall intensity. (2) Under the same rainfall intensity, the amount of sputter erosion is negatively correlated with the vegetation coverage, and the relationship can be expressed as an exponential function with e as the bottom. The amount of sputter erosion decreases with the increase of vegetation coverage, which is significant before the vegetation coverage is 40%. It can be considered that 40% vegetation coverage is a critical value. (3) In the case of the same vegetation coverage , The amount of sputter erosion decreased with the increase of splashing distance, and the amount of splashing within each splashing distance was negatively correlated with the vegetation coverage. The effect of vegetation cover on splash erosion gradually diminishes as the distance increases.