数字农科院2.0

Effects of Wind Velocity and Aggregate Size on Wind Erosion Characteristics of Loose Subsoil From the Mollisols Region of China: A Wind Tunnel Assessment

文献类型： 外文期刊

作者： Xu, Yanyan;Liu, Bao;Wen, Yanru;Auerswald, Karl;Ge, Zhenghu;Gao, Donglai;Peng, Xinhua;Li, Ting-Yong;Dai, Huimin;Wu, Wenbin

作者机构：

关键词： aggregate size;erosion-exposed subsoil;Mollisols;soil loss;vertical mass-flow profile

期刊名称： LAND DEGRADATION & DEVELOPMENT

ISSN： 1085-3278

年卷期： 2026 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Soil erosion is a severe form of land degradation that threatens food production, especially in Northeast China, where fertile Mollisols dominate the agricultural landscape. Most previous studies have quantified soil erosion by water, while wind erosion of severely water-eroded areas with exposed loose subsoil remains rarely explored. Here, we present a wind tunnel experiment (75 measurements) with different wind velocities and aggregate size classes (< 53, 53-250, 250-850, and 850-2000 mu m) to assess the wind erosion behavior of loose subsoil. Free-stream wind velocities of 10, 12, 14, and 16 m s(-1) resulted in shear velocities ranging from 0.15 to 0.75 m s(-1). The variation of shear velocity depended on the interaction between free-stream wind velocity and the surface roughness as influenced by aggregate size (R-2 = 0.40). The maximum aggregate size was also a good predictor of threshold velocity (R-2 = 0.84). Moreover, mass flux at higher elevations increased with wind velocity for both the 53-250 and 250-850 mu m groups, whereas near-bed behavior varied by aggregate size. The second-finest fraction (53-250 mu m) always exhibited an obvious peak in mass flux with height. The peak height increased slightly from 3 to 5 cm with increasing wind velocity. The second-coarsest fraction (250-850 mu m) developed a pronounced peak height only at the highest wind velocity (16 m s(-1)). These wind tunnel experiments on sieved loose subsurface soil materials indicate potential wind-driven transport. They also demonstrate that sever water erosion may additionally increase wind erosion and should be avoided to safeguard soil resources and food security.

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