地表粗糙度反映地表对风速减弱的作用以及对风沙流的影响 ,其值大小取决于地形、植被覆盖及作物的播种方向 ,粗糙度越大风蚀强度越小。吉林省西部流动沙丘的起沙风速为 1 0 3m/s,风蚀耕地的起沙风速为 6 3～ 7.9m/s。春季侵蚀性风能为 1 72 1 8(v·u)。该区风蚀性气候因子和侵蚀性风能自东向西递增 ,西北部的通榆为最大 Surface roughness reflects the effect of surface attenuation on wind speed and its effect on wind-blown sand flow. The value depends on the topography, vegetation coverage and crop sowing direction. The greater the roughness, the smaller the erosion intensity. The moving sand dunes in the west of Jilin Province have a wind speed of 103 m / s, and wind-blown cultivated land has a wind speed of 63 ~ 7.9 m / s. Erosive wind energy in spring is 1 72 1 8 (v · u). Wind erosion climate factors and aggressive wind energy in this area increased from east to west, with Tongyu in the northwest being the largest