平行高立式沙障对严重沙化草地土壤有机质含量及颗粒组成的影响

Impacts of High-parallel Sand-barrier on Soil Organic Matter Contents and Particle Composition of Serious Desertified Grassland

为探索沙化草地植被恢复新途径 ,进而为制止草地退化制定有效措施提供理论支持 ,在草地严重沙化后形成的沙丘 ,且其上设置有不同年龄 (2～ 3年和 4～ 5年 )平行高立式芦苇沙障的地段 ,分别对沙丘不同部位 (迎风坡、背风坡和丘间低地 )及沙障不同位置 (沙障迎风面、背风面和两沙障中间 )土壤有机质含量和土壤颗粒组成 (机械组成 )进行测定 ,并以同类型未设沙障的地段作对照 ,对平行高立式沙障治理严重沙化草地的效益进行了研究。结果表明 ,在严重沙化草地设置平行高立式沙障 ,可显著提高土壤有机质含量 ,土壤颗粒组成中 ,较粗的沙粒含量减少 。

In order to find some new ways for vegetation rehabilitation of desertified grassland,and provide theoretical support for taking effective measures to prevent grassland from degradation,based on the investigation of the soil organic matter contents and soil prarticle composition in different parts of sand dunes,(windward slope,leeward slope and lowland between sand dunes) and in the different locations of sand-barrier (the windward side parts,leeward side and the intersection of sand-barrier),where the grassland was in serious desertification and installed with high-parallel reed sand-barrier of different ages (2～3 and 4～5 years),it was studied that the high-parallel sand-barrier's benefits on controlling grassland after serious desertification by comparing with the same kind of places without sand-barrier. The results showed that contents of soil organic matter could be increased obviously by installation of high-parallel sand-barrier in grassland after serious desertification. In the terms of particle composition,coarse sand was decreased and fine sand was increased.