容重变化对土壤溶质运移特征的影响  

Effect of Bulk Density Changes on Soil Solute Transport Characteristics

作　　者：吕殿青[1,2] 王宏[1] 潘云[1] 王玲[1] 

机构地区：[1]湖南师范大学资源与环境科学学院,中国长沙410081 [2]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,中国杨陵712100

出　　处：《湖南师范大学自然科学学报》2010年第1期75-79,共5页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金资助项目(40801083);湖南省重点学科资助项目(2008001);湖南省教育厅青年项目(09B061)

摘　　要：以湖南红壤和陕西塿土为试验土样,测定了不同容重条件下的Cl-的穿透曲线,并应用对流弥散溶质迁移模型和CXTFIT软件程序对实验数据进行拟合获得平均孔隙流速和水动力弥散系数.结果表明:随着容重的增大,Cl-的运移穿透转折点和平均穿透点的时间越长,平均孔隙流速呈幂函数递减,而水动力弥散系数以幂函数递增.容重变化对红壤中溶质运移的影响明显大于塿土.Breakthrough curves of Cl-are measured in different bulk densities for Red soil in Hunan province and Loutu soil in Shanxi province.Average pore velocity and hydrodynamic dispersion coefficient are derived by advection-dispersion solute transport model and CXTFIT soft fitting experiment data.The results showed that a turning point of breakthrough and average breakthrough point become larger,average pore velocity decreases and hydrodynamic dispersion coefficient increases by power function respectively with increase of bulk density.Influence of bulk density on solute transport is greater in Red soil than in Loutu soil.

关 键 词：容重变化 穿透曲线 对流弥散 平均孔隙流速 水动力弥散系数 

分 类 号：S152.7[农业科学—土壤学]