干旱区生态环境知识资源中心(Arid): 干旱区绿洲土壤Cd/Pb复合污染下重金属形态转化与生物有效性

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	干旱区绿洲土壤Cd/Pb复合污染下重金属形态转化与生物有效性
其他题名	Speciation and Bioavailability of Heavy Metals Under Combined Pollution of Cadmium and Lead in Arid Oasis Soils
	周婷; 南忠仁; 王胜利; 武文飞; 廖琴; 王宁
来源期刊	农业环境科学学报
ISSN	1672-2043
出版年	2012
卷号	31 期号:6 页码:1089-1096
中文摘要	采用盆栽试验及连续浸提形态分级方法,研究了Cd和Pb在土壤中的形态分布规律及其对油菜的生物有效性的影响。结果表明,当土壤受外源Cd/Pb污染后,重金属的形态分布特征发生了变化,以可交换态(EXC)响应最大,Cd、Pb的赋存形态分别以碳酸盐结合态(CAB)、铁锰氧化态(FMO)和碳酸盐结合态(CAB)为主;一定浓度范围内的Cd/Pb复合胁迫能促进油菜的生长,油菜根系和茎叶的Cd、Pb含量均随着Cd/Pb复合胁迫水平的升高而持续增加。茎叶中的Cd含量远远高于根系,Pb含量反之。油菜可将更多的Cd从根系转移至茎叶,而将更多的Pb滞留在根系中;对油菜根系吸收Cd最重要的形态为可交换态(EXC)和碳酸盐结合态(CAB),而对茎叶吸收Cd以及油菜吸收Pb贡献最大的则为碳酸盐结合态(CAB)。
英文摘要	Pot experiment and Tessier sequential extraction were conducted to study the speciation of Cd and Pb forms and their bioavailability in rape(Brassica campestris L.)in the oasis soils.The results showed that after soil polluted by selected heavy metals,the distribution of their chemical forms changed in soil after pollution by Cd and Pb,and the largest response was exchangeable form of Cd.Cd existed mainly in carbonate-form,while Pb mainly in carbonate-form and Fe-Mn oxide bound form.The combined stress with Cd/Pb in a certain range could promote the growth of rape.Cd/Pb content in rape roots and shoots increased with increasing combined stress concentration in soils.Cd content in stems and leaves was much higher than that in roots,and Pb was exactly the opposite.Rape could transfer most Cd from roots to stems and leaves,while the great part of Pb remain in roots.The exchangeable form and carbonate-form made the most contribution to the content of Cd in roots,while carbonate-form made the most contribution to the content of Cd in stems and leaves,and Pb in rape.
中文关键词	镉 ; 铅 ; 形态分布 ; 化学形态 ; 生物有效性
英文关键词	cadmium lead speciation distribution chemical forms bioavailability
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:4578442
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228361
作者单位	兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	周婷,南忠仁,王胜利,等. 干旱区绿洲土壤Cd/Pb复合污染下重金属形态转化与生物有效性[J]. 兰州大学,2012,31(6):1089-1096.
APA	周婷,南忠仁,王胜利,武文飞,廖琴,&王宁.(2012).干旱区绿洲土壤Cd/Pb复合污染下重金属形态转化与生物有效性.农业环境科学学报,31(6),1089-1096.
MLA	周婷,et al."干旱区绿洲土壤Cd/Pb复合污染下重金属形态转化与生物有效性".农业环境科学学报 31.6(2012):1089-1096.