本研究针对长江上游生态环境建设和水土资源可持续发展的关键，以紫色土坡耕地为研究对象，采用野外人工模拟降雨试验与室内分析相结合的方法，从地表糙度角度，探索横坡垄作在溅蚀、片蚀和细沟侵蚀过程中随作物生长的变化特征，阐明其在溅蚀-片蚀-细沟侵蚀侵蚀演化中与径流、侵蚀产沙的耦合关系，弄清溅蚀、片蚀与细沟侵蚀在作物不同生育期及坡面侵蚀过程中发生的临界条件及贡献率，寻求不同侵蚀阶段的最佳防蚀期，揭示侵蚀演化过程中作物防蚀的响应机制。这一研究，为进一步理解紫色土坡耕地水蚀机理及侵蚀过程模型的建立奠定基础，为指导坡耕地管理提供新的思路及理论依据。

Slope farmland of purple soil was studied in order to sustainable development in this study for the ecological environment construction and water resources in the upper reaches of the Yangtze River.By the methods of field artificial rainfall simulation experiments and laboratory analysis, the changing characteristics of cross-slope with different growth stages was analyzed during splash erosion, sheet erosion and rill erosion based on soil surface roughness. It was obtained to the coupling relationship between the evolution of splash erosion - sheet erosion - rill erosion and runoff, erosion, sediment yield.The critical condition and the contribution rate were clarified during the splash erosion, on-chip erosion and rill erosion occurred in the crop growth period and slope erosion processes. To seek a different stage of preventing and controlling erosion and reveal the response of the corrosion mechanism of erosion of the evolution of crop, the corresponding study was done. The study provide theory basis for revealing the erosion characteristics and erosion process model, and at the same time, it can provide new ideas and theoretical basis for the guidance of sloping farmland management.