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坡长对土壤侵蚀的影响可能随雨强不同而发生变异,采用岔巴沟流域径流场资料对该问题进行了研究。分析了不同雨强范围下坡长对土壤侵蚀的影响,探讨了坡面土壤侵蚀的临界坡长。结果表明,坡长与土壤侵蚀的关系受雨强效应的影响;团山沟坡面坡长与土壤侵蚀的关系在I30高于和低于0.21 mm min-1表现出不同的规律:当I30≤0.21 mm min-1即小雨强范围时,随着坡长从20 m到60 m的增加,土壤侵蚀模数而逐渐减小,此时,土壤侵蚀模数随坡长的变化趋势与径流模数随坡长变化的趋势相同;当I30>0.21 mm min-1即大雨强范围时,随着坡长从20 m到60 m的增加,土壤侵蚀模数先增加后趋于稳定,土壤侵蚀模数随坡长变化的趋势与径流平均含沙量随坡长变化的趋势相同;坡面土壤侵蚀的临界坡长非定值,是关于I30的函数。
The influence of slope length on soil erosion may vary with different rainfall intensities. This problem has been studied by using the data of runoff field in Chabagou Catchment. The influence of downhill length on soil erosion under different rainfall intensity was analyzed. The critical slope length of soil erosion on slope was discussed. The results show that the relationship between slope length and soil erosion is affected by the strong rain effect. The relationship between the slope length of slope and the soil erosion shows different rules when I30 is above and below 0.21 mm min-1. When I30≤0.21 mm min-1, that is, the intensity of soil erosion decreases with the increase of slope length from 20 m to 60 m. In this case, the trend of soil erosion modulus with the slope length changes with the runoff modulus When I30> 0.21 mm min-1, that is, the rainfall intensity range, with the slope length increasing from 20 m to 60 m, the soil erosion modulus first increased and then stabilized. The soil erosion modulus The trends of slope length change and runoff average sediment concentration have the same trend with slope length. The critical slope length of slope soil erosion is non-fixed, which is a function of I30.