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通过在高泉沟小流域建立的水土流失监测网络，系统研究了小流域自然因素和人为因素与土壤侵蚀的关系，小流域水土流失时空变化规律及小流域水流泥沙概念性耦合模型，揭示了定西黄土丘陵沟壑区土壤侵蚀规律，并建立了坡面土壤侵蚀数学模型。人为因素减水减沙的贡献率分别为７９．１１％和８５．６９％，由降雨减少引起的减水减沙的贡献率分别为２０．８９％和１４．３％；并应用水流泥沙概念性耦合模型，对“两期”治理效果进行了分析评价，探索了模型法评估水土保持减水减沙总效果的途径。
Through the monitoring network of soil and water loss established in the Gaoquangou watershed, the relationship between natural and anthropogenic factors and soil erosion in small watershed, the temporal and spatial variation of soil and water loss in small watershed and the conceptual coupling model of runoff and sediment in small watershed were systematically studied. The law of soil erosion in the gully area of Dingxi hilly region was established and a mathematical model of slope soil erosion was established. The contribution rates of man-made factors to water and sediment reduction are 79.11% and 85.69%, respectively, and the contribution rates of water and sediment reduction caused by rainfall reduction are 20.89% and 14.3% respectively. Conceptual coupling model, the paper analyzes and evaluates the effect of “two phases” governance and explores the ways of the model method to evaluate the total effect of soil and water conservation for reducing water and sediment.