Diffussion Characteristics of Water Soluable Cations in Engineering Loess

Wang Zhaohui

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Diffussion Characteristics of Water Soluable Cations in Engineering Loess

- Diffussion Characteristics of Water Soluable Cations in Engineering Loess
- Bulletin of Soiland Water Conservation Vol. 17, Issue 2, Pages: 9-13(1998)
- 作者机构：
  
  1. 西北农业大学资源与环境科学系
  2. 水利部西北水利科学研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：1998
- 稿件说明：
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Wang Zhaohui. Diffussion Characteristics of Water Soluable Cations in Engineering Loess[J]. Bulletin of Soiland Water Conservation, 1998, 17(2): 9-13.
DOI：

Wang Zhaohui. Diffussion Characteristics of Water Soluable Cations in Engineering Loess[J]. Bulletin of Soiland Water Conservation, 1998, 17(2): 9-13. DOI：

摘要

该文采用水平扩散池观测了水溶性盐阳离子在工程黄土中的扩散过程。结果表明：水溶性盐阳离子在土壤中的扩散特性因离子种类而异，Ca

的扩散系数最高，Mg

依次降低，其由两个模型测定的平均值分别为2.6928×10

-6

2.3127×10

-6

1.6730×10

-6

0.4504×10

-6

/s.在距源溶液较近时，土壤胶体交换性K

均明显升高，特别是交换性K

升高幅度最大；而交换性Ca

却明显减少，说明K

被土壤胶体吸附，而Ca

不但没有吸附，反而被解吸。

Abstract

Horizontal diffussion cells were used to observe and measure the diffussion processes of the water soluable salt cations in engineering loess.The results obtained showed that the diffussion characteristics of every cation changed with its variety.The diffussion coefficient of Ca2+was the highest

and that of Mg2+

Na+ and K+ dropped in turn.The mean values of them determined in the two models were 2.692 8×10-6

2.312 7×10-6

1.6370×10-6 and 0.4504×10-6cm2/s respectively.The significant increase of the exchangeable K+

Na+ and Mg2+

and the decrease of the exchangeable Ca2+in soil near the source solution indicated that the formers were absorpted and the later was desorpted by the soil collision.

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