带状高立式沙障防治草地沙化机理的研究  

Mechanism of High-banded Sand-barriers for Controlling Grassland Desertification

作　　者：曹子龙[1] 赵廷宁[1] 郑翠玲[1] 孙保平[1] 

机构地区：[1]北京林业大学水土保持学院,北京100083

出　　处：《水土保持通报》2005年第4期15-19,共5页Bulletin of Soil and Water Conservation

基　　金："十五"国家科技攻关项目(2002BA517A-10)

摘　　要：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 a和4～5 a)带状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)土壤种子库、土壤有机质含量和土壤机械组成进行了研究,并以同类型未设沙障的地段作对照,深入地对带状高立式沙障防治草地沙化的机理进行了研究.结果表明,在严重沙化草地设置带状高立式沙障,可有效拦截风沙流中所携带的植物种子,丰富土壤种子库,提高土壤有机质含量,使土壤机械组成中,较粗的砂粒含量减少,较细的砂粒含量增加.Based on the investigation of soil seed bank, the soil organic matter contents and soil mechanical composition in different parts of sand dunes, so-called windward side, leeward side and lowland of sand dune, also the windward side parts, leeward side and the intersection of sand-barrier separately, where the sandy grassland in seriously desertificated and installed with high-banded sand-barrier of different years （2-3 and 4-5 years）. The mechanism of high-banded sand-barriers for controlling desertification of grassland are studied by comparing with the same kind of places without sand-barrier. The result shows that installation of high-banded sand-barrier in seriously desertificated grassland can intercept seeds in sandy-driving wind, enriching seed bank, increase the contents of soil organic matter, decrease the coarse sand particles, increase the contents of minute sand parts in soil particlesize composition.

关 键 词：带状高立式沙障 草地沙化 种子库 土壤有机质 土壤机械组成 

分 类 号：S288[农业科学—农业水土工程]