Abstract: Overgrazing will destroy grassland and seriously affect the vegetation characteristics of desert grassland， resulting in frequent soil wind erosion. In this study， the Stipa breviflora desert steppe in Inner Mongolia was taken as the research object. In the long-term wind erosion monitoring and gradient grazing experimental platform， the Terrestrial Laser Scanner （TLS） was used to perform multi-station scanning on the sample plot in August 2023. The data of grassland wind erosion and vegetation characteristics （vegetation coverage， height， and porosity） under different grazing intensities were systematically measured， and the variation of vegetation characteristics and aeolian sediment flux and the relationship between them were analyzed. The results showed that ： （1） TLS measurement showed that vegetation height and coverage were significantly negatively correlated with grazing intensity （P<0.05）， while vegetation porosity was significantly positively correlated with it （P<0.001）. （2） The increase of grazing intensity increased the total aeolian sediment flux， especially at the height of 0-30 cm near the ground （P<0.05）. The total aeolian sediment flux in the light （LG）， moderate （MG） and heavy （HG） grazing areas was 0.36，0.78 and 0.90 times that in the control area （CK）， respectively. （3） Vegetation characteristics significantly affected the near-surface aeolian sediment flux. Vegetation coverage and height were negatively correlated with it， and vegetation porosity was significantly positively correlated（P<0.05）. Vegetation coverage was the main influencing factor， and the role of vegetation porosity at the same height was prominent. Therefore， reasonable grazing is of great significance to maintain the stability of grassland ecosystem and resist wind-sand erosion.

Key words: Terrestrial Laser Scanner, Vegetation characterization, Grazing, Wind erosion, Desert grasslands, Aeolian sediment flux

摘要： 过度放牧会破坏草地，严重影响荒漠草原植被特征，导致土壤风蚀现象频发。本研究以内蒙古短花针茅荒漠草原为研究对象，在长期风蚀监测及梯度放牧实验平台中，通过使用地基激光雷达（Terrestrial laser scanner， TLS）对2023年8月样地实施多站扫描，系统测定不同放牧强度下草地风蚀物与植被特征数据（植被盖度、高度、疏透度），分析植被特征与风沙通量的变化规律及其二者间的相互关系。结果显示：（1）TLS测定表明，植被高度、盖度与放牧强度呈显著负相关（P<0.05），植被疏透度则与之呈极显著正相关（P<0.001），放牧强度增大致使草地斑块化加剧。（2）放牧强度增加提升总风沙通量，尤其是0~30 cm近地面高度处影响显著（P<0.05），轻度（LG）、中度（MG）、重度（HG）放牧区的总风沙通量分别是对照区（CK）的0.36，0.78和0.90倍。（3）植被特征显著影响近地面风沙通量，植被盖度、高度与其呈负相关，植被疏透度呈显著正相关（P<0.05），植被盖度为主要影响因素，同一高度处植被疏透度作用凸显。因此，合理放牧对维持草地生态系统稳定、抵御风沙侵蚀具有一定意义。

关键词: 地面激光雷达, 植被特征, 放牧, 风蚀, 荒漠草原, 风沙通量