寒旱区土壤盐渍土水盐迁移机理研究进展

Research Progress on Mechanism of Soil Water and Salt Transfer in Saline Soil in Cold and Arid Regions

我国西北大量的寒旱区广泛分布着盐渍土,其受季节性影响,盐渍土冻胀融对该地区房屋建筑、道路交通和农业生产等均有影响。为有效解决土壤的盐胀冻胀问题,需深入研究变化环境条件下水盐运移的机理。盐渍土中水盐分迁移的四大基本要素有未冻水含量、温度、土水势和盐分,介绍了4种国内外常见冻土水盐迁移模型并对基于盐渍土水盐迁移机理研究现状及存在的问题进行分析,展望了新形势下盐渍土水盐迁移的发展趋势,旨在为今后土体水盐迁移模型研究提供新的思路。

A large number of cold and arid regions in northwest of China are widely distributed with frozen soil and saline soil,frost heaving and thawing caused by seasonal effects,greatly affect building construction,road traffic and agricultural production in this area.In order to effectively solve problems of soil salt heaving and frost heaving,it is necessary to deeply understand research results of water and salt transport mechanism under changing environmental conditions.Four basic elements of water and salt migration in saline soil are as follows:unfrozen water content,temperature,soil water potential and salinity.Four common frozen soil water and salt migration models in China and other foreign countries are introduced.Finally,based on analysis on current situation and existing problems of mechanism of water and salt migration in saline soil,the future development trend of water and salt migration in saline soil under the new situation is prospected,aiming to provide new ideas for study of soil water and salt migration models in the future.