花岗岩红壤表土特征及对坡面侵蚀影响的研究  

Study on Soil Surface Characteristics and Its Effect on Slope Erosion of Red Soils Derived from Granite

作　　者：蔡崇法[1] 丁树文[1] 张光远[1] 

机构地区：[1]武汉华中农业大学土化系

出　　处：《水土保持研究》1996年第4期111-115,共5页Research of Soil and Water Conservation

基　　金：国家自然科学基金

摘　　要：以鄂南花岗岩红壤为研究对象，采用人工降雨试验与调查观测相结合的方法，研究了表土（０～２ｃｍ）的形态和颗粒组成，降雨过程中的变化过程及其对坡面侵蚀的影响。结果表明：１）花岗岩红壤稳定的表土是一上部多砾石，下部较紧密的紧实层。２）紧实层是耕作层表面在降雨过程中经历结皮、压实、粗化几个过程后形成的。３）紧实层的存在影响地表入渗和坡面产流产沙量。The soil surface(0￣2cm) characteristics of red soils,derived from granites,were studied in southern Hubei.In addition,the change of soil surface and its effect on slope erosion were also studied by the rainfall simulation experiment in the laboratory and in the field.The results indicated as follows:1) The soil surface,called a density horizon,consisted of a gravel layer and a heavy density layer.2) The density horizon formed through three stages:firstly surface crusting formed,then the crusting broken and the density layer formed,lastly the density horizon formed.3) The density horizon may influence the content of sediment in the runoff.

关 键 词：表土特性 紧实层 坡面侵蚀 花岗岩 

分 类 号：S157[农业科学—土壤学]