研究论文
李恋卿,潘根兴,张平究,龚伟.太湖地区水稻土颗粒中重金属元素的分布及其对环境变化的响应[J].环境科学学报,2001,21(5):607-612
太湖地区水稻土颗粒中重金属元素的分布及其对环境变化的响应
- Distribution of heavy metals in particle size fractions of major paddy soils in the Tai Lake region, China and the response to soil environmental change
- 基金项目：国家自然科学基金重点项目(49831070);江苏省自然科学基金重点项目(BK99196)
- 作者
- 单位
- 李恋卿
- 南京农业大学农业资源与生态环境研究所,南京 210095
- 潘根兴
- 南京农业大学农业资源与生态环境研究所,南京 210095
- 张平究
- 南京农业大学农业资源与生态环境研究所,南京 210095
- 龚伟
- 南京农业大学农业资源与生态环境研究所,南京 210095
- 摘要：采用原状土样分离技术,研究了太湖地区几种主要水稻土不同颗粒中重金属元素Pb、Cr、Cd的分布.结果表明这些元素在不同粒径的土壤颗粒中分配迥异,重金属含量在>0.25mm的粗颗粒和<0.002mm的细颗粒中较高,且与土壤有机碳有密切的关系;重金属元素主要积累于>0.25mm的粗颗粒中,Cd的粗颗粒积累比Pb、Cr更强烈.耕层土壤重金属的颗粒分配因土壤种类不同而异,并响应于土壤环境变化.提出以分馏系数表示重金属在土壤颗粒的分配特点.
- Abstract：By the undisturbed soil sampling and soil particle size fractionating with ultrasonic separation, distribution of heavy metals in soil particle size fractions in major paddy soil type in the Tai Lake region, China was studied. For Pb, Cr and Cd, different distribution pattern were found. Both in coarse fraction (>0.25mm) and the fine fraction (<0.002mm),the contents of these elements were high and closely associated with soil organic carbon; The accumulation of these elements especially of Cd was predominantly contributed by the particles coarser than 0.25mm in diameter. The distribution pattern varied with soil type and gave response to soil environmental change. A parameter of fractionation index is proposed to indicate such changes.
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