塑料方格沙障的固沙原理及其推广应用前景

Study on Fixing Sand Principals of Plastic Checkerboard Sand-Barrier and Its Potential Application

塑料方格沙障以高密度的聚乙烯(HDPE)为主要原料人工合成,透风系数为30%～45%,固沙机制同麦草、粘土沙障不同,具有防风固沙作用效果好,操作技术简单,使用期限长,运输方便等优点,但同时存在投入相对较高,容易沙埋、掏蚀,使推广大受限制。研究认为适宜在干旱地区退化植被的恢复重建中推广应用,与退化植被共同作用下,在实现防风固沙目标的同时避免或减轻了沙障固定桩和迎风网下的掏蚀,能促进退化植被的恢复。

Plastic checkerboard sand-barrier net is made of high-density polyethylene mostly, it ventilation coefficient is 30%~45%. Compare to wheat strew sand barrier and clay sand barrier, its mechanism to fix shifting sands is different, has the advantages such as good effect on breaking wind and fixing shifting sands, technology simple, long period to use and easy to transport, also has the disadvantages such as high cost, bury and hollow out at the area of stabilization picket and under windward net which affect plastic sand barrier to extend seriously. Results showed that plastic sand barrier together with degenerated vegetation realize the aim of breaking wind and fixing shifting sands, also reduce or avoid hollowing and benefit to degenerated vegetation restoration.