摘要
为探究盐渍化土壤水分下渗规律、水分下渗能力及水盐动态运移过程,设计了土壤剖面分层定水头供水及土壤剖面变水头供水下渗实验。测定不同层位土壤水分下渗率、含水率、孔隙水溶液电导率及土壤体电导率等参数,进行入渗条件下水盐动态运移规律分析。试验结果表明:盐渍化土水分下渗规律可由积水入渗Kostiakov模型进行刻画;浅层0~40 cm土壤相对于深层40~60 cm土壤具有较强的拦截和贮存入渗水分能力;盐渍化土壤盐分变动带位于浅层0~40 cm,且20~40 cm深度的土壤盐分波动幅度较大,深层40~60 cm土壤孔隙水溶液盐分向下运移的通量与土壤体盐分对其的补充量达到动态平衡,水分下渗过程中深层土壤孔隙水盐分含量相对平稳。实验结果为盐渍土的防治提供参考。
In order to explore the law of water infiltration,the ability of water infiltration,the dynamic movement of water and salt in saline soils,an experiment of water infiltration with fixed and variable water head of water supply of soil profile was designed to determine the soil water infiltration rate,water content,the conductivity of pore water solution and soil body,which were used to study the law of water and salt dynamic migration under infiltration conditions.The test results show that the law of saline soil water infiltration can be described by the Kostiakov model of water infiltration.The shallow 0-40 cm soil has a stronger ability to intercept and store infiltration moisture than the deep layer 40-60 cm soil.The salt variation zone is located at 0-40 cm in the shallow layer and the soil salinity fluctuated greatly at the depth of 20-40 cm.The flux of the downward migration of the salt solution in the deep 40-60 cm soil pore water and the supplement of the salt content of the soil body reach a dynamic balance.In the process of water infiltration,the salt content of deep soil pore water is relatively stable.Through research,the dynamic migration process of soil moisture and salinity at different depths in the process of water infiltration of saline soil was explained,which provides theoretical guidance for the prevention and treatment of saline soil.
作者
孙晓庆
卞建民
赵玉红
杨平
孟修敬
SUN Xiaoqing;BIAN Jianmin;ZHAO Yuhong;YANG Ping;MENG Xiujing(College of New Energy and Environment,Jilin University,Changchun 130021,China;Ordnance Industry and Geoteclmical Institute Co.,Ltd.,Bejing 100053,China)
出处
《实验室研究与探索》
CAS
北大核心
2021年第2期12-17,共6页
Research and Exploration In Laboratory
基金
国家自然科学基金面上项目(41072255)
吉林省科技厅自然科学基金项目(20150101116JC)
2017年度吉林省本科高等教育教学改革研究课题。
关键词
下渗实验
盐渍土
下渗规律
下渗能力
水盐动态
infiltration experiment
saline soil
infiltration law
infiltration ability
water-salt dynamics
