防风障和防风林从两方面影响风蚀。第一是减低背风面风速;第二是缩短了田间长度,因而减轻了风蚀。目前已用来作为防风障的有如下方法:营造1—10行乔木和灌木的防风林,种植窄条状农作物,建立雪墙、木篱笆、石墙和土堤等。每一种防风障的效果取决于风速、风向和风障的形状、宽度、孔隙度。当风向与防风林成直角时,林带附近风速可减低70—80%,距离二十倍带高处风速减低20%;但 Windbreaks and windbreaks affect wind erosion in two ways. The first is to reduce the wind speed on the leeward side. The second is to shorten the length of the field and thus reduce wind erosion. Currently used as a windbreak, there are ways to create windbreaks with 1-10 rows of trees and shrubs, grow narrow strips of crops and build snow walls, wooden fences, stone walls and embankments. The effectiveness of each weather barrier depends on the shape, width and porosity of the wind speed, wind direction and wind barrier. When the wind direction is at right angles to the windbreak, the wind speed near the forest belt can be reduced by 70-80% and the wind speed 20% from the height of the belt reduced by 20%. However,