Abstract:

Based on the analysis and observation of the near-surface wind power environment and soil physical and chemical properties of the Dunhuang Heishanzui engineering control area and unregulated area， the research studied the wind regime and sand-fixation's comprehensive benefits under the regulated project of Heishanzui.It is helpful for the wind dynamic in-depth study in this region for the future and provides the reference of the sandstorm disaster comprehensive governance. The results show that the average wind speed and the frequency of sand-driving wind are significantly reduced， the intensity of sand transport is reduced， the annual sand transport potential is reduced by 85%， and the windy weather is reduced in the Heishanzui engineering control area compared with the unregulated area. In the same time， the contents of soil nutrients， water and salt increased significantly at a certain depth. Taking total nitrogen， total phosphorus and total potassium as an example， their growth rates reached 322.5%， 49.3% and 15.1% at 5 cm depth， respectively. The effects of total nitrogen and soluble salt on other components increased， and soil fertility increased significantly. The change trend of soil conductivity and soluble salt content was the same in the two regions， but the two contents increased significantly in the soil surface in the engineering control area， so we should be vigilant of surface salinization.

Key words: sandstorm control project, Dunhuang, sand-driving wind, drift potential, soil physical and chemical properties