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黄土高原沟壑区小流域土壤侵蚀系统为一多维开放系统，由沟间地子系统和沟谷子系统组成。系统中物质与能量的交换、＂耗散＂发生在小流域侵蚀的产流、产沙过程中。通过对激励变量的发生规律以及激励变量和状态变量与土壤侵蚀关系的分析，得出和验证了一些侵蚀规律，解释了林地保持水土的部分机理，给出了降雨、地形的最佳组合指标，并宏观地论述了该区短时期内的泥沙输移问题。
The soil erosion system of the small watershed in the gully area of the Loess Plateau is a multidimensional open system consisting of the intergrowth subsystem and the valley subsystem. System of material and energy exchange, “dissipation” occurred in the small watershed erosion runoff, sediment production process. Through the analysis of the law of excitation variables and the relationship between incentive variables and state variables and soil erosion, some erosion rules were obtained and validated. Some mechanisms of woodland conservation were explained, and the best combination index of rainfall and topography was given. And macroscopically discusses the problem of sediment transport within a short period in this area.