Fuction of Preventing Wind and Sand Flow for Accumulated Sand-belts in Oasis Edge：Taking Hexi Desert Area of Gansu Province as an Example

A accumulated sand-belt was formed in upper wind direction of oasis edge in Hexi desert area of Gansu province through prevening and controling desertification for 60 years or so.Study on accumulated sand-belt indicated that the formation of accumulated sand-belt was beneficial to wind and sand resistance of oasis edge.And its fuction of preventing wind strengthened with the increases of wind speed.The emphasis of prevening and controling desertification for oasis edge should be placed on accumulated sand-belt in the future.Especially the emphasis was sand ridges lind of accumulated sand-belt.Afforestation was implemented in desert oasis transitional zone.This could large area compress range of implementing agricultural ecological engineering measures and improve investment benefit of prevening and controling desertification.