干旱区生态环境知识资源中心(Arid): 绿洲土Pb-Zn复合胁迫下重金属形态特征和生物有效性

Arid

	绿洲土Pb-Zn复合胁迫下重金属形态特征和生物有效性
其他题名	Speciation Characteristics and Bioavailability of Heavy Metals in Oasis Soil Under Pb, Zn Combined Stress
	金诚; 赵转军; 南忠仁; 王胜利; 武文飞; 王厚成
来源期刊	环境科学
ISSN	0250-3301
出版年	2015
卷号	36 期号:5 页码:1870-1876
中文摘要	通过对Pb-Zn复合胁迫下干旱区绿洲土壤中油菜种植进行盆栽试验模拟,探讨了重金属复合污染对油菜生长的影响及其各形态之间的转化规律和生物有效性.结果表明,低浓度Pb、 Zn处理下,油菜生长得到促进,茎叶生长优势大于根系.随着外源重金属的投加,土壤中Pb、 Zn主要赋存形态较对照均由紧结合态向松结合态转化,重金属生物有效性提升;可交换态Pb、碳酸盐结合态Zn分别是油菜不同部位吸收Pb、 Zn的主要贡献形态.油菜在低浓度胁迫水平对Pb、 Zn的富集能力和转移能力强于高浓度胁迫水平,且油菜对Pb、 Zn的富集、迁移系数均随土壤中对应元素或共存元素生物有效态含量的增大而减小.所有处理中,油菜茎叶中的Pb含量均超出了食品安全限量指标,建议在此类土壤种植叶菜类蔬菜前进行相关指标检测.
英文摘要	Pot experiments were conducted on cole (Brassica) grown in oasis soil under combined stress of lead and zinc, to study the effect of heavy metal combined pollution on cole growth as well as the speciation conversion rules and bioavailability. The result showed that the promoting effect on cole growth was shown in the low concentration treatments, especially on stem leaves. With addition of exotic heavy metals, the main speciations of Pb and Zn in the soil transformed from tight-bound to loose-bound forms as compared to the control, and the bioavailability of heavy metals was increased. And, the exchangeable Pb and the carbonate bound form of Zn were the major contributing speciations which were absorbed in different parts of cole. What’s more, the capabilities of uptake and translocation of Pb and Zn by cole were stronger at lower stress levels, and the enrichment and migration coefficients decreased with the increasing content of bioavailable fraction of the corresponding element or the coexisting element. In all treatments, the Pb concentration in the stem leaves of cole exceeded the food safety threshold, therefore it is recommended to conduct detection of relevant indicators before planting foliage vegetables in this kind of soil.
中文关键词	油菜 ; 绿洲土壤 ; 铅 ; 锌 ; 形态特征 ; 生物有效性
英文关键词	cole oasis soil lead zinc speciation characteristics 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:5431973
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/2XILL650/232910
作者单位	兰州大学资源环境学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	金诚,赵转军,南忠仁,等. 绿洲土Pb-Zn复合胁迫下重金属形态特征和生物有效性[J]. 兰州大学,2015,36(5):1870-1876.
APA	金诚,赵转军,南忠仁,王胜利,武文飞,&王厚成.(2015).绿洲土Pb-Zn复合胁迫下重金属形态特征和生物有效性.环境科学,36(5),1870-1876.
MLA	金诚,et al."绿洲土Pb-Zn复合胁迫下重金属形态特征和生物有效性".环境科学 36.5(2015):1870-1876.