【摘要】 土壤风蚀是干旱和半干旱地区普遍存在的生态环境问题，严重影响区域土壤资源与生态系统稳定性。为揭示农牧交错带不同地表类型在连续风蚀事件下的动态响应特征，文中利用野外移动式风洞在坝上地区开展了翻耕地与草地的连续风蚀模拟试验，监测不同风速扰动下的输沙率、PM₁₀流失通量及轰击效率（η）变化。结果表明：1)风蚀过程具有显著的非稳态性，连续风蚀作用导致输沙率与PM₁₀流失通量持续下降，起动风速逐步升高，反映出颗粒选择性迁移与地表粗化过程。2)地表类型显著调控风蚀强度与演变路径，翻耕地因扰动破坏导致风蚀响应剧烈且衰减迅速，草地则依靠根系稳定性表现出更强的抗蚀能力。3)轰击效率（η）在不同地表间呈现出差异化演化，翻耕地η值随风蚀推进逐步升高，揭示跃移颗粒动能增强与撞击释放强化机制，草地η值则波动明显，反映其复合结构下释放机制更为复杂。文中揭示了不同地表类型在连续风蚀过程中的多尺度动态响应规律，为风尘排放机制解析与区域风蚀防控策略制定提供了理论支撑。但鉴于试验周期较短，结论仍需通过更长期、多区域的观测加以验证。更多还原

【Abstract】 Soil wind erosion is a widespread ecological and environmental issue in arid and semi-arid regions, posing a serious threat to soil resources and ecosystem stability. To reveal the dynamic responses of different surface types in the agro-pastoral ecotone under successive wind erosion events, this study employed a field-based mobile wind tunnel to conduct continuous wind erosion simulations on ploughed cropland and natural grassland in the Bashang region.Key parameters including threshold wind velocity, sediment transport rate, and PM₁₀ concentration were measured. The results indicate that: 1) The wind erosion process exhibited a typical non-steady-state behavior, with erosion intensity decreasing progressively over successive events, reflecting surface coarsening and enhanced erosion resistance. 2) Land use type significantly regulated wind erosion intensity in ploughed cropland, characterized by lower threshold velocity, loose soil structure, and higher fine particle content, showed much higher erosion susceptibility than grassland, even after surface coarsening. 3)Bombardment efficiency（η） demonstrated clear dependence on wind speed and surface type. Specifically, η decreased with increasing wind speed.On ploughed cropland, η increased over successive erosion events, while grassland exhibited more fluctuant η values, likely due to its complex surface structure. These findings deepen the understanding of wind erosion mechanisms in agro-pastoral ecotone and provide scientific support for land management and erosion control strategies. However, due to the limited duration and scope of the experiment, further long-term and multi-site field investigations are needed to validate these conclusions.更多还原