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用种树种草的方法治理流沙称为植物治沙或生物治沙,生物治沙不仅能够长久地固定流沙,而且能够解决沙区的木料、燃料、饲料、肥料缺乏问题,除害兴利,一举两得。但是在一些沙区,当流沙严重地威胁着铁路、公路交通要道或重要工厂、工程基地时,由于种树种草见效迟缓或根本不能成功的情况下,这就需要采取工程治沙(也称机械治沙)措施。工程治沙虽然见效快,但需要大量材料,而且用工多、成本高,只有在不得已的情况下才采用这种措施。工程治沙是通过机械沙障改变风沙流的速度和结构,从而削弱沙地的风蚀、沙埋程度,最终达到防护目的。机械沙障分为直立式沙障和平铺式沙障两大类。直立式沙障的作用在于;风沙流中的沙子有80～90％是在贴近地表30厘米以内高度通过,在风沙流通
Treating quicksand with the method of planting trees and grass is called plant sand control or biological sand control. Biological sand control not only can fix quicksand for a long time, but also can solve the problems of lack of wood, fuel, feed and fertilizer in the sand area, Kill two birds with one stone. However, in some sandy areas, when runaways seriously threaten railways, highways, or major factories or engineering bases, the need for engineering sand control due to delayed or ineffective planting of trees and grass That mechanical control of sand) measures. Although effective in controlling desertification, it requires a lot of materials, more labor and more costs. It is only used as a last resort. Sand control engineering is to change the speed and structure of wind-blown sand flow through mechanical sand barrier so as to weaken the wind erosion and sand-burial degree in the sand so as to finally achieve the purpose of protection. Mechanical sand barrier into vertical sand barrier and tiled sand barrier two categories. The function of vertical sand barrier is that 80 to 90% of the sand in the sand blown flows passes through a height of 30 cm close to the earth’s surface,