| 重金属元素Cd在水稻土剖面中的分配系数及其影响因素研究:以四川省成都平原区为例 |
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| 引用本文： | 杨晓燕,侯青叶,杨忠芳.重金属元素Cd在水稻土剖面中的分配系数及其影响因素研究:以四川省成都平原区为例[J].地学前缘,2013,20(2). |
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| 作者姓名： | 杨晓燕 侯青叶 杨忠芳 |
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| 作者单位： | 中国地质大学(北京)地球科学与资源学院,北京,100083 |
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| 基金项目： | 中国地质调查局国土资源调查项目 |
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| 摘 要： | 以四川省成都平原区农田生态系统水稻土剖面为例,探讨了Cd分配系数及其影响因素。结果表明:Cd分配系数(Kd)在污染土壤环境和本底土壤环境中是不同的,在剖面PM-3、PM-6和PM-8剖面中污染环境中分配系数(Kd)大于本底环境中的分配系数,而在剖面PM-7中,本底环境中的分配系数(Kd)大于污染环境中的值。在污染环境Cd分配系数受土壤pH值、交换性Mg和铁硅氧化物的影响比较大,而在非污染环境中分配系数受到土壤可溶性Al、Cd全量和铁锰铝氧化物的影响较大。这些土壤的物化性质对分配系数造成影响,使得土壤滤渣和土壤原土中Cd形态含量存在差异。
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| 关 键 词： | 分配系数 镉 土壤溶液 本底环境 |
Solid-solution partitioning of Cd and factors controlling the partitioning coefficient in paddy soil profiles: A case study of the Chengdu Plain in Sichuan Province |
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| Abstract: | For understanding geochemical behaviors of cadmium(Cd),it is essential to study the partitioning coefficient(Kd) of Cd and the factors controlling the Kd in soil environment.This study focuses on the distribution of Cd between the soil solution and soil solid phase in paddy soil profiles in Chengdu agro-ecosystems in Sichuan Province,in order to discuss the factors controlling the partition coefficient.It is known that the Kd value of Cd in contaminated soils is different from that in the original soils.In profile PM-3,PM-6 and PM-8,the Kd in the contaminated soil layer is larger than that in the original layers,however,in profile PM-7 it is on the contrary.The results show that the partition coefficient of Cd is closely related with soil physical-chemical properties.The partition coefficient(Kd) is influenced by soil pH,exchangeable Al,and iron and silicon oxides in the contaminated soils,while in the original soils it is extremely sensitive to soil soluble Al,total cadmium and oxides of iron,manganese and aluminum.Because of the impact of these soil physical and chemical properties on the partition coefficient,the different distribution of geochemical species of cadmium between the soil residues and the original soils exists. |
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| Keywords: | partition coefficient cadmium soil solution original environment |
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