西藏地区土壤渗透性能研究

Study on Soil Permeability Coefficient in Tibet

[目的]研究西藏地区代表性土壤的渗透性能。[方法]从拉萨、日喀则、林芝、山南、阿里等地区采集黏土与砂壤土,测定其基本性质和渗透性能。[结果]西藏3地区土壤的渗透系数变化为0.93×10-3～7.82×10-6cm/s;土壤渗透性能存在着空间上的变异性,土壤含水量对土壤渗透性能有极其显著的影响;土壤容重、孔隙度及孔隙类型和土壤黏粒含量均对渗透性能有不同程度的影响。[结论]渗透系数的大小与含水量、土的结构、颗粒组成、密实程度等多种因素有关。

[Objective]The research aimed to study the soil permeability coefficient in Tibet.[Method]Ball clay and sandy loam samples were collected from Lhasa,Shigatse,Nyingchi,Shannan,Ali in Tibet.And the basic properties,permeabilities of them were determined.[Result]The results showed that soil subgroup hydraulic conductivity changed between 0.93×10-3-7.82×10-6 cm/s in 3 areas of Tibet.Soil permeability had changeability in spatial,and soil moisture content had extremely remarkable influence on soil permeability performance.Soil bulk specific gravity,porosity,porosity type and soil clay content had varying degree influence on penetrating quality.[Conclusion]Soil permeability had relationship with many factors such as water content,soil stucture,grain composition and compaction rate.