黄土丘陵区不同地类土壤入渗性能研究  

Infiltration Performance of Different Land Use in Loess Hilly Region

作　　者：李贵玉[1] 胡慧方[1] 廖建文[1] 马永[1] 

机构地区：[1]中水珠江规划勘测设计有限公司,广东广州510610

出　　处：《中国水土保持》2010年第12期36-40,共5页Soil and Water Conservation in China

摘　　要：采用PVC管在梯田、果园和坝地3种地类取原状土样,土样分表土层、心土层及整体3个层次。将土样带回实验室内采用无压力的供水入渗装置测定土壤的入渗性能。对每个土样的入渗性能进行连续跟踪观测,以土柱底部的稳定出水率为该土层深度的稳渗率。研究结果表明:不同地类土壤的入渗性能存在很大差异,同一地类不同深度土层的入渗性能差异也很显著;原状土的入渗能力要好于扰动土,表层土的入渗结构及入渗能力好于心土层;用原状土进行入渗试验能够更真实地表征土壤的入渗性能,将入渗速率引入测定深度概念,能更精确地表述土壤在垂直尺度上的空间变化和影响因子,对更科学准确地研究土壤入渗、完善土壤入渗理论具有重要的指导价值。It takes undisturbed samples from three levels of top soil,subsoil and check soil of three types of land use of terraced field,orchard and dammed land by using PVC tube.It tests the infiltration performance of soil by using non-pressure water supply and infiltration device in laboratory.It conducts continuous tracking observation of the infiltration performance of each sample and takes steady outflow from the bottom of soil columns as steady infiltration rate of the depth of soil layer.The study outcomes show that a) the infiltration performance of different land use is greatly different and the infiltration performance for different soil depth of the same land use is also obviously different;b) the infiltration capacity of undisturbed soil is greater than that of disturbed soil and the structure and capability of infiltration of top soil is better than that of subsoil;c) the test with undisturbed soil can truly show the infiltration performance of soil.Introducing infiltration rate into the concept of depth determination,presenting the spatial variation on vertical scale and the affecting factor of soil more accurately,it will have important guiding values to study on soil infiltration and improve the theory of soil infiltration.

关 键 词：不同地类 土壤入渗 原状土壤 扰动土壤 黄土丘陵区 

分 类 号：S157.3[农业科学—土壤学]