Study On Construction Of Module Sand Barrier And Its Protection Benefits

Based on windbreak and sand fixation theory of sandbag sand barrier, in order to realize the low cost and high benefits management target, module sand barrier were set up on moving dunes. Module sand barrier was a kind of sandbag sand barrier, it could control wind erosion, at the same time, it could improve local soil and recover vegetation by added to retention of water and fertilizer materials and plant seeds in sandbag. The paper researched the wind erosion around the module sand barrier, the property of physical, chemical and biological in and out of module sand barrier, and the revegetation around and at the top of module sand barrier, understood the effect of its3benefits and found out reasonable construction parameters, provided theoretical basis for the promotion and application of module sand barrier. The main results were as follows:1. Module sand barrier could reduce the wind effectively and control surficial soil erosion. Average thickness of sand accumulation in the half encirclement area at windward side of module sand barrier was3.16cm, and leeward side was13.19cm. But There was erosion within two sides of module sand barrier, but amount of wind erosion reduced by41.10%than moving dunes.2. The number of soil microorganism, enzyme activity, available K, organic matter and soil water content in module sand barrier inside microbes were higher observably than the control when module sand barriers were filled with corn/maize formulations. Amount of3main edaphon in module sand barrier filled with corn cobs and com straw formulas were145.65and113.11times of the control; soil sucrase were21.26and42.18times the control; soil available K were higher by129.02%and295.91%than the control: soil organic matter content were10.42and93.95times the control; soil water content were higher by69.62%and68.66%than the control. With the increase in corn cobs or corn stalks while adding volume first increased stability when added up to20%after each index values were tended stable.3. The above soil indicators of modules sand barrier covered were higher than not covered, but along with increasing of the distance or the depth soil indicators showed a decreasing trend, but all higher significantly than the control, sand barrier module had achieved "fertile island" effect after the module were set up sand barriers5years, and improvement effect of soil around of modules sand barrier was obvious.4. It were able to establish vegetation around and on the top of module sand barrier. and plants were better than the control. In addition to plant density decreased, Plant species, quantity, coverage, biomass were increased with the growth of protection period of module sand barrier. Module settings sand barrier at the top in2008compared with2012setting module sand barrier vegetation cover and biomass, were increased by106.86%and58.23%. Module sand barrier protective soil zone was gradually stabilized, and the emergence of Salsola and Polygonum Park and other sub-indicator plants, and ephemeral plants Agriophyllum gradually disappear, moving dunes had stabilized.5.3kinds of packaging materials, soil improvement and vegetation restoration of sacks module sand barrier was the best and material cost was minimum, per hectare were about3600yuan, laying of sand barrier was consuming149.25h/hm2.