土壤冻结过程中盐分运移规律的研究

Study on Laws of Soil Salt Migration during Soil Freezing Process

土壤在冻融过程中水和溶质迁移规律的研究,是土木工程的冻害防治、水土环境保护、陆地水循环、土壤次生盐渍化防治等领域的重要基础内容。通过室内实验对天津市西青区和静海地区4种不同质地的土壤冻结过程中的盐分(Cl-、Ca2+和有效P)的迁移规律进行了研究。实验采用室内短土柱法,对土样进行冻结实验,采用滴定法、比色法对盐分进行化学分析。结果表明,土壤冻结过程中,盐分添加相同,土质不同对盐分运移存在较大差异。添加盐分不同,同一土质,对同种盐分运移有较大不同。土质和盐分添加的交互作用,影响盐分的运移。

The study of soil water and solute migration during freezing-thawing process is an important basic content in the fields of prevention and control of freezing damage in civil engineering,soil and water environment protection,land water circulation,soil secondary salinization and so on.In this study,the migration of salt(Cl-,Ca2+and available P)in four soils with different textures during freezing process in Xiqing District and Jinghai District of Tianjin was studied by laboratory experiments.In this experiment,the laboratory short soil column method was used to freeze the soil samples,and the chemical analysis of salt was carried out by titration and colorimetric method.The results showed that there were great differences in the salt transport among different soils under the same added salt in the process of the soil freezing,and there were great differences in the migration of the salt in the same soil under different added salt in the process of the soil freezing.The salt migration was affected by the interaction between the soil and the salt addition.