Mechanism of Soil Salt moisture Transfer Under Freeze-thawing Condition

ZHANG Dianfa; ZHENG Qihong; DONG Zhiying

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Mechanism of Soil Salt moisture Transfer Under Freeze-thawing Condition

- Mechanism of Soil Salt moisture Transfer Under Freeze-thawing Condition
- Bulletin of Soiland Water Conservation Vol. 24, Issue 6, Pages: 14-18(2005)
- 作者机构：
  
  宁波大学人居环境研究所,浙江,宁波,315211
- 作者简介：
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- Published：2005
- 稿件说明：
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ZHANG Dianfa, ZHENG Qihong, DONG Zhiying. Mechanism of Soil Salt moisture Transfer Under Freeze-thawing Condition[J]. Bulletin of Soiland Water Conservation, 2005, 24(6): 14-18.
DOI：

ZHANG Dianfa, ZHENG Qihong, DONG Zhiying. Mechanism of Soil Salt moisture Transfer Under Freeze-thawing Condition[J]. Bulletin of Soiland Water Conservation, 2005, 24(6): 14-18. DOI：

摘要

土壤冻融过程中的水盐运动是冻土学研究的基本问题之一。在土壤冻融过程中，存在着水分和盐分的2次迁移过程，形成了特殊的水盐运动规律。土壤冻结过程中盐分的运动非常复杂，受土壤类型、土壤初始含水量、土壤溶液浓度、盐分组成以及冻结生成的温度、热梯度、冻结速度、冻结方向等因素影响，其迁移结果最终是上述各因素共同作用的结果。温度是导致土壤中水分迁移的驱动力，土壤冻结引起冻结带土水势降低，导致水分不断向冻层迁移，随着水分向冻层聚集，冻层以下土层中的盐分同步向上运移，整个冻层的土壤含盐量明显增加。在融化过程中，随着地表蒸发逐渐强烈，使冻结过程中累积于冻结层中的盐分，转而向地表强烈聚集，使表层的盐分含量急剧上升。

Abstract

One of basic problems of cryopedology the sallmoisture transfer in soil freeze-thawing processes.The special lawis up of the two times salt-moisture transfer affected by soil type

initial moisture content

salinity and temperature. emperatureis its driving force. Salt moves towards frozen layer with moisturefor soilwater po-tential falling in the freeze process

so salinity contentivencxeases in the frozen layer continuously. In the thawing process

salinity and moisture cumulated in the frozen soil layer move up again with evaporation

salinity of the surface layer increasing sharply. The resultof simulated experiment notonly proves the formation process of the soil salinization

but also provides theory for prevention and〔ure of soil salinization the freeze-thawarea of the North China.

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