| 摘要: |
| 用36Ｃｌ标记扩散池法测定了不同含水量及不同容重下４种质地土壤Ｃｌ-的扩散系数。结果表明，Ｃｌ-扩散系数随土壤水分增加和容重增大而近乎线性增大，在有效水范围内，４种土壤增大的幅度为：黄绵土＞黑垆土＞塿土＞黄褐土；在容重１．１～１．６ｇ／ｃｍ3范围内，以１．３～１．４ｇ／ｃｍ3为界，质地较轻的黄绵土和黑垆土，在此之前Ｃｌ-扩散系数随容重增加较慢，在此之后增加较快；而质地粘重的土和黄褐土则相反。对Ｃｌ-扩散而言，水分与容重、容重与温度之间没有交互作用。 |
| 关键词: 氯离子，扩散系数，土壤含水量，土壤容重 |
| DOI： |
| 分类号:S152.5 |
| 基金项目: |
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| Effect o fWater Content and Bulk Density on the Diffusion of Chloride Ions in Soils |
|
Xu Minggang Zhang Yiping Sun Benhua
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| Abstract: |
| The diffusion coefficients of chloride ions in four different textural soils
with effective water content and varying bulk density from 1.1 to 1.69/cm3 were measured by the method of diffusion-cell using 36Cl labelled CaCl2 solution.Although a
near linear increase in the diffusion coeffieient with increasing soil moisture or with increasing bulk density in all the soils was observed,the increase characteristic of different soils was not the same.The increase extent of the diffusion coefficeint with increasing soil moisture in the four soils decreased in the order as follows:loessial soil>black
Lou soil>Lou soil>yellow cinnamon soil,which showed that the lighter the soil texture,the greater the increase extent.In lighter texture soils or loessial soil and black
Lou soil,the increase scope of the diffusion coefficient with increasing bulk density
ranging from 1.1 to 1.3 or 1.4g/cm3,was lower,and from 1.3 or 1.4 to 1.6g/cm3 was
higher.But in heavier texture soils,Lou soil and yellow cinnamon soil,the increase
range of the diffusion coefficient with increasing bulk density in the former was higher,
and in the latter was lower.Moreover,according to the multiple regression analyses,no
interactions of moisture with bulk density and bulk density with temperature were noted. |
| Key words: Chloride ion, diffusion coefficient, soil water content,soil bulk density |
