辽西北地区风力侵蚀过程分析

辽西北地区土壤沙漠化形成的主要原因是土壤风蚀，为了定量评价辽西北沙化土壤在风力作用下的侵蚀状况，研究采用埋钎法，观测风速与土壤剥蚀深度及堆积厚度的关系。研究得出固定沙丘和流动沙丘的土壤剥蚀深度均随着风速的加大而增加；流动沙丘和固定沙丘，随着风速的加大，背风坡的坡中与坡脚的土壤堆积厚度均有不同程度的增加，而由于风力的剥蚀作用，坡顶的堆积厚度与风速呈负相关；一年内观测到的流动沙丘，半流动沙丘，固定沙丘的平均风蚀强度分别为167.9，57.8，4.2 mm/d。

Analysis of Wind Erosion in Northwest Area of Liaoning Province

The main reason for formation of soil desertification in northwestern Liaoning is the wind erosion. With respect to quantitative evaluation the Liaoning Northwest sandy soil under the action of wind, this study adopted embedded brazing method to observe the relationship between wind speed and soil erosion depth and stack depth. Soil erosion depth of fixed dunes and mobile dune increased with the increase of flow velocity; mobile dune and fixed dune, as the wind speed increased, the accumulation thickness increased in the middle and toe of soil leeward slope at different degrees, due to wind erosion action, the accumulated thickness at the top was negatively related to wind speed; the average intensities of wind erosion of the mobile dune, semi mobile dune, fixed sand dunes, were 167.9 mm/day, 57.8 mm/day, 4.2 mm/day, respectively, within one observed year.