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Position: Home > Articles > Research on Soil Water and Salt Transportation Characteristics  under the Effect of Freezing and Thawing Water Saving Irrigation 2014 (5) 52-54

冻融作用下的土壤水盐逗移特征研究

作  者:
陈乃嘉;宋培源;李嘉瑞
单  位:
吉林大学环境与资源学院
关键词:
冻融;盐渍土;水盐运移
摘  要:
由于冻结和融化过程中存在相变换、温度梯度等多方面因素的影响,冻融过程中的水盐运移较为复杂.针对吉林西部土壤盐渍化问题,以大安市苏打盐渍土为研究对象,采用实地采样与室内模拟对比实验相结合的方法设计开展了土壤冻融实验.实验结果表明,冻融作用定向地改变土壤中的盐分和水分在各层的分布,影响水盐运移的因素主要为温度梯度和蒸发作用.在温度梯度的驱动下土壤中的水分和盐分存在自下而上的运移,受蒸发作用的影响水分蒸发而盐分留在土壤上部,致使土壤上部含盐量升高,土壤趋于盐碱化.长此以往将造成土壤盐渍化.
译  名:
Research on Soil Water and Salt Transportation Characteristics  under the Effect of Freezing and Thawing
关键词:
freezing and melting%salinized soil%water and salt transportation
摘  要:
Due to the influence of various factors such as phase variation and temperature gradient m the lreezmg ana memng process, the water and salt transportation is more complicated. This paper aims at the problem of soil salinization in the west Jilin, takes Da 'an salinized soil as research object, and uses the method of combining the field sampling and indoor simulation experiment to conduct soil freezing and mehing experiment. The experiment results show that the freeze-thaw effect directionally changes the soil salt and water distribution in each layer; the main influencing factors for water and salt transportation are the temperature gradient and evaporation function; under the driving of the temperature gradient, the water and salt migrates from the bottom to the top in the soil; affected by the evaporation, the water evaporates while the salt stays in the upper soil, which makes the salt in the upper soil increases and the soil becomes salinizatiorL If things go on like this, it will cause soil salinification.

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