Cd-Pb-Zn复合污染物在胡萝卜中的富集迁移及交互作用——以干旱区绿洲土壤为例  

Enrichment,transportation and interaction character of combined cadmium,lead and zinc pollutants in carrot——take oasis soil from arid zone as an example

作　　者：刘晓文[1] 李媛[1] 南忠仁[1] 赵转军[1] 丁海霞[1] 王胜利[1] 

机构地区：[1]兰州大学资源环境学院西部环境教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2009年第2期1-6,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(40671167);国家环境保护公益性项目(NEPCP 200809098);国家重点基础发展研究计划(973计划)项目(2008 CB 417 212)

摘　　要：采用盆栽实验研究外源Cd-Pb-Zn复合污染物对胡萝卜生长的影响及其在胡萝卜中的富集、迁移特征.结果表明:在外源Cd,Zn,Pb质量分数分别为≤1.25,≤180,≤230 mg/kg水平下,外源Cd-Pb-Zn的添加促进了胡萝卜的生长,表现为其干重和根茎干重较对照点的增加.经统计回归分析可知:胡萝卜中重金属质量分数主要与土壤中该元素活性态的分配系数有关,共存元素也有一定的协同或拮抗作用.其中Cd受Pb和Zn的影响不突出,胡萝卜中Pb的质量分数受土壤中共存Zn的影响, Zn的质量分数受共存Cd的影响,共存元素的赋存形态不同其影响也不同.Cd,Pb,Zn在胡萝卜各组织中的富集系数与迁移系数虽然与外源添加Cd-Pb-Zn的质量分数有关,但基本表现为Cd>Zn>Pb.Pot experiments of combined contamination with cadmium, lead and zinc were carried out with oasis carrot growing soil. The results show that the combined contamination of Cd-Pb-Zn can affect the carrot growth. When the input Cd content is within 1.25 mg/kg, Zn within 180 mg/kg, and Pb within 230 mg/kg. The carrot/root biomass of carrot grows more slowly than in uncontaminated soil. The concentrations of Cd, Pb, Zn in carrot are not only influenced by the heavy contents fortified in the soil, but also affected by Cd-Pb-Zn interactions. The heavy metal fractionation distribution in the polluted soil is a main factor for the interactive effect. Pb and Zn in soil did not show obvious interactive effect on the Cd content in carrot. The coexisted Zn in soil has an effect on the Pb absorbed by the carrot, while the coexisted Cd affects the Zn concentration. The BCF and TF of Cd, Pb and Zn in carrot are also affected by the heavy metal content input into soil. Their BCF and TF in contaminated soil is mostly as follows： Cd〉Zn〉Pb.

关 键 词：绿洲土壤 胡萝卜 重金属复合污染 

分 类 号：P903[天文地球—自然地理学] X53[环境科学与工程—环境工程]