科尔沁沙地流动沙丘塑料防沙网防风固沙效果试验

Effect of Plastics Sand Barrier Net on Windbreak and Sand-fixation in Mobile Sand Dunes of Horqin Sandy Land

为了检测塑料防沙网的防风固沙效果,在科尔沁沙地开展不同设置方式(立式、平铺及组合)、不同间距(立式)塑料防沙网的固沙效果比较研究。结果表明:塑料防沙网的设置可以提高植被恢复速度,防护区短期内物种数量、植被盖度迅速增加,其中以平铺防沙网与立式防沙网相结合效果较好;立式防沙网能够明显降低风速,最大可降低风速达48.2%,间距6m的防沙网降低风速效果好于间距10m的防沙网;立式防沙网具有较好的阻沙效果,可阻拦沉降较大粒径的沙尘,但对土壤水分无明显影响;平铺式防沙网具有较强的抗风蚀作用,固着沙表面效果显著。塑料防沙网固沙方式可在植物生存困难区域设置有效的防风固沙系统。

In order to test the effect of plastics sand barrier net on windbreak and sand-fixation in mobile dunes,the effect of different set modes(upright,tiled the net and combined two modes on sand dunes surface)and different spacing between the net line of plastics sand barrier net was studied in Horqin sandy land.The results showed that the plastics sand barrier net could distinctly increase the speed of vegetation restoration,and the species number and vegetation coverage increased rapidly.Combined with upright and tiled plastics sand barrier net had best windbreak and sand-fixation effects.The upright plastics net mode could distinctly reduce the wind speed,and depress the wind speed to 48.2%.The 6mspacing between the upright net line modes had the best windbreak effect than other modes.The upright net mode had preferable block sand moving function,and blocked the big diameter sandy grain sedimentation on back of plastics net.The plastics net used to stabilize mobile sand dunes did not affect the soil water content under the net.The mode of plastics net tiled on sand dunes surface had strongly anti-wind eroding effect,and it could fix the sand surface effectively.The plastics sand barrier net could structure the effective windbreak and sand fixation system on some area that the plants could not survive condition.