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本文分析了在天然降雨条件下中龄山杨林和28a油松人工林的溅蚀试验资料,结果表明,在同一土壤和同一坡度条件下,最大30mim雨强、林内降雨量、枯枝落叶层厚度是决定溅蚀发生的主要因素,且溅蚀量与其呈二次多项式回归关系。但当枯枝落叶层具有一定厚度时溅蚀与其它因素无关。当I_30为0.07mm/min或P_0为3.3mm时去掉枯枝落叶层有溅蚀发生,在I_30为0.35mm/min或P_0为25.56mm时具1cm枯枝落叶层山杨林下不发生溅蚀,油松林有极少量贱蚀;随枯枝落叶层厚度增加,溅蚀量剧减,实验证明:山杨林下枯枝落叶层积累大于1cm、油松林积累到2cm时没有溅蚀发生,起到了保持水土的作用。
In this paper, we analyzed the experimental data of the erosion of mid-aged Yangling and 28-year-old Pinus tabulaeformis plantations under natural rainfall. The results showed that under the same soil and the same slope conditions, the maximum rainfall intensity of 30 mim, the rainfall in the forest, Thickness is the main factor that determines the occurrence of splashing, and the amount of sputter erosion is a second order polynomial regression relationship. However, when the litter layer has a certain thickness, splashing has nothing to do with other factors. When I_30 is 0.07mm / min or P_0 is 3.3mm, there is splashing in the litter layer. When I_30 is 0.35mm / min or P_0 is 25.56mm, it has 1cm litter layer. , The Pinus tabulaeformis forest has a very small amount of erosion; With the increase of the thickness of the litter layer, the amount of sputter erosion drastically reduced. Experiments show that: the litter layer accumulation in the Poplar forest is more than 1cm; To maintain the role of soil and water.