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在分析水利部土壤侵蚀强度分级两种方法的基础上,以黄河流域为例分析了间接指标分级法的适用性。直接指标法以年均土壤侵蚀模数或年均土壤侵蚀厚度为指标划分侵蚀强度级别;而间接指标法以下垫面影响土壤侵蚀的自然因子为指标,判断土壤侵蚀强度。实际应用中直接获得侵蚀模数和侵蚀厚度比较困难,因此一般用间接指标法评估土壤侵蚀强度。基于前期研究建立的土壤侵蚀快速评估法,用间接因子评估了黄河流域土壤侵蚀强度,通过与遥感调查结果的比较,分析了间接指标法的适用性,为该方法的应用提供了参考依据。
Based on the analysis of two methods of grading of soil erosion intensity of Ministry of Water Resources, the applicability of indirect index grading method is analyzed with Yellow River Basin as an example. The direct index method divides the erosion intensity level by the average annual soil erosion modulus or the annual average soil erosion thickness. The indirect index method uses the natural factors of the underlying soil surface erosion as the index to judge the soil erosion intensity. In practice, it is difficult to directly obtain the erosion modulus and the erosion thickness. Therefore, the soil erosion intensity is generally estimated by the indirect index method. Based on the rapid assessment of soil erosion established by previous studies, the soil erosion intensity of the Yellow River Basin was evaluated by indirect factors. The applicability of the indirect index method was analyzed by comparison with the results of remote sensing survey, which provided a reference for the application of this method.