干旱区生态环境知识资源中心

Xilamuren grassland in arid and semi-arid climate of desert steppe, soil erosion is one of the main factors in the area of ecological degradation. The sand wind speed is an important factor of soil erosion. The sand in the process of critical wind speed and friction velocity is an important parameter of sand process is one of the key indicators, but also on the sand movement in wind engineering problems to solve. Through nearly five years of wind erosion monitoring data analysis, we can get the following conclusions: during the observation period, the minimum threshold values of wind speed is 4.675m/s, the maximum critical wind speed is 10.44m/s, the average value is 7.55m/s, which indicates that the field threshold wind speed value is difficult to maintain in a stable state. 2011 desert steppe soil erosion on the average threshold friction velocityis 0.26m/s, the minimum critical friction velocity of soil erosion is 0.11m/s, the maximum threshold friction velocity of soil erosion is 0.57m/s, the critical friction velocity affected by meteorological factors and vegetation factors.