| 土壤中重金属元素Pb、Cd地球化学行为影响因素研究 |
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| 引用本文： | 余涛,杨忠芳,钟坚,程新彬.土壤中重金属元素Pb、Cd地球化学行为影响因素研究[J].地学前缘,2008,15(5):67. |
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| 作者姓名： | 余涛 杨忠芳 钟坚 程新彬 |
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| 作者单位： | 1. 中国地质大学(北京)地球科学与资源学院,北京,100083;中国地质大学(北京)地质调查研究院,北京,100083
2. 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： | 中国地质调查局地质调查项目，中国地质大学(北京)创新团队项目 |
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| 摘 要： | 通过研究湖南洞庭湖地区水稻土中Pb、Cd与土壤有机质、粘粒和pH值的关系,结果表明,(1)土壤中有机质含量与Cd、Pb有着显著的正相关性,土壤中有机质含量增加可明显降低Cd和Pb的离子态和可交换态含量。(2)随着粘粒含量增加,Pb和Cd离子可交换态占全量的比值略有增加,这说明粘粒表面吸附的Pb和Cd容易进入植物体中,对生态系统安全具有危害的组分。(3)Cd离子交换态与土壤pH值呈显著相关关系,土壤酸化使Cd的离子交换态比例上升,可直接导致农作物中Cd含量增加,防止土壤酸化是控制Cd对生态系统危害的有效途径;Pb的离子交换态与全量的比值与pH值具有显著的相关性,对于Pb污染严重的土壤,保持土壤pH值在弱酸性至弱碱性范围,防止土壤酸化和盐碱化,可以降低Pb危害。土壤有机质含量、pH值等是控制重金属元素地球化学行为的重要因素之一。
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| 关 键 词： | 重金属元素 有机质 粘粒 土壤pH值 |
Factors affecting the geochemical behavior of heavy metal elements Pb and Cd in soil |
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| Yu Tao,Yang Zhongfang,Zhong Jian,Cheng Xinbin.Factors affecting the geochemical behavior of heavy metal elements Pb and Cd in soil[J].Earth Science Frontiers,2008,15(5):67. |
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| Authors: | Yu Tao Yang Zhongfang Zhong Jian Cheng Xinbin |
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| Abstract: | In this paper,we have studied the relationship of lead and cadmium to the organic matter,clay content and pH in the paddy soil in the Dongting lake region,Hunan Province.It shows that the content of organic matter has a distinct relationship to cadmium or lead in soil.The increase in organic matter in soil may obviously lower the content of cadmium or lead in ionic and exchangeable form.Also,the increase in clay content in soil may slightly increase the proportion of the content of cadmium and lead in ionic exchangeable form to the total content of Pb and Cd.The lead or cadmium that is adsorbed in the clay surface may enter into the frond more easily,and would endanger the ecosystem.The soil acidification may increase the content of cadmium in ionic exchangeable form,which has a distinct relationship to the pH in soil,and directly results in the increase in cadmium content in crop,thus it is a good way to avoid ecosystem damage by preventing soil acidification.The proportion of the content of lead in ionic exchangeable form to the total content of lead is distinctly related to the pH in soil;keeping soil pH in a range of less acidity to alkalescence is a better way to prevent soil acidification or basification in the heavily lead-polluted area.It is concluded that the soil organic matter and soil pH are the most important factors controlling the geochemical behavior of heavy metals. |
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| Keywords: | heavy metal element organic matter clay soil pH |
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