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作 者 ：安韶山,常庆瑞,刘京,李壁成

期 刊 ：生态学报 2003年 23卷 1期 页码：106~111

关键词：沙化土地；土壤性质；农牧交错带；发生过程；

Keywords:the agriculture and animal interlace zone, land desertification, soil properties, genesis process,

摘 要 ：通过对陕北农牧交错带不同类型沙化土地土体构型、土壤质地、元素组成和理化性质的分析 ,研究了土地沙化的本质。结果表明 :受风沙作用影响 ,土壤中细粒物质逐渐减少 ,颗粒组成变粗 ;表层消失 ,最终被流沙所取代 ,原土壤剖面被覆盖在沙层之下 ;土壤有机质及养分含量减少 ,保水保肥性能降低 ,生产力不断下降 ;现代土壤形成过程以侵蚀和风沙沉积为主 ,物质淋溶和化学风化微弱。研究区土地沙化可划分为 :风沙侵蚀为主、风沙蚀积平衡、风沙沉积为主和土壤形成发育 4个阶段 ;沙化土地的类型有 :肥力衰退质地粗化、表层剥蚀、片沙覆盖、流动沙丘与固定沙丘等 5种。

Abstract:Land sandification is one of the main kinds of desertification in arid and semi-arid areas as well as parts of semi-moist area. China is the most endangered by land sandification in the world, in which there are about 1.607 million km2 total area, and still extending 2.460 thousands km2 every year. In this article, matter composition, soil physical and chemical characteristics and soil bulk structures are analyzed for studying the occurring mechanism and essential characteristics in agriculture and animal h...

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