干旱区生态环境知识资源中心(Arid): 干旱区污染绿洲土壤中Cd和Zn形态分布与生物有效性

Arid

	干旱区污染绿洲土壤中Cd和Zn形态分布与生物有效性
其他题名	Form distribution of Cd, Zn and bioavailability in arid contaminated oasis soil
	杨一鸣; 南忠仁; 赵转军; 王胜利
来源期刊	兰州大学学报. 自然科学版
ISSN	0455-2059
出版年	2010
卷号	46 期号:1 页码:59-64
中文摘要	利用盆栽试验研究了干旱区污染绿洲土壤中Cd和Zn形态分布与生物有效性.结果表明:少量的Cd和Zn有促进油菜生长的作用,但高质量分数的Cd和Zn对油菜的生长有明显抑制作用;原状绿洲土壤中Cd和Zn形态以残渣态为主,随着绿洲土壤中Cd和Zn污染程度的加深,Cd和Zn各形态分布发生了显著变化,其中碳酸盐结合态Cd和Zn和铁锰氧化物结合态Cd和Zn质量分数大幅增加,并逐渐占据绝对优势,而残渣态Cd和Zn质量分数则几乎不变.相关分析表明土壤中的铁锰氧化物结合态Cd质量分数与油菜叶和根部的Cd质量分数呈极显著相关,表明土壤中的铁锰氧化物结合态Cd对油菜叶和根部累积Cd有最大贡献;铁锰氧化物结合态Zn和有机物结合态Zn分别与油菜根部和叶部的Zn质量分数呈极显著相关,表明土壤中铁锰氧化物结合态Zn和有机物结合态Zn分别对油菜根和叶部累积Zn贡献最大;油菜叶和根部Cd的富集系数均大于Zn的,表明油菜吸收Cd的能力大于Zn的;两种金属的富集系数叶部的均大于根部的,表明Cd和Zn的迁移性较强,且Cd在油菜中的迁移能力大于Zn的,其毒害作用也相应大于Zn的.两种金属主要累积在油菜可食用的叶部,因此对人体健康有潜在威胁.
英文摘要	Pot experiment was conducted to study the distribution of cadmium, zinc fractionations and their availability to the rape in arid oasis soil in northwest China. The result showed that lower concentrations of Cd and Zn could promote rape growth, but higher concentrations could obviously inhibit rape growth.Cd and Zn fractionations in the uncontaminated oasis soil existed almost in the residual fractionation, but with Cd and Zn pollution degree rising in the oasis soil, Cd and Zn fractionations distribution changed significantly, in which carbonate-bound and Fe-Mn oxide-bound Cd and Zn concentrations were significantly increased and gradually occupied the absolute superiority. however, the residual Cd and Zn concentrations were almost unchanged. The significant correlation was found between Fe-Mn oxide-bound Cd concentration and Cd concentration in rape leaves and roots, which showed that Fe-Mn oxide-bound Cd made the greatest contribution to Cd accumulation in rape leaves and roots. Similarly, there was a significant correlation between Fe-Mn oxide-bound Zn and organic-bound Zn concentrations and concentrations in rape leaves and roots, respectively, suggesting that Fe-Mn oxide-bound Zn and organic-bound Zn made the greatest contributions to Zn accumulation in rape leaves and roots, respectively. The Bio-concentration Factors (BCF) of Cd in rape leaves and roots were all greater than Zn, which showed that the uptake capability of Cd in the rape was greater than Zn. moreover, the BCFs of the two metals in leaves were greater than in roots, which showed that Cd and Zn had the stronger migration capability and the transferring capability of Cd in the rape was greater than Zn. Also, the toxic effect of Cd was greater than Zn, and the two metals mainly accumulated in the edible leaves. Therefore, Cd and Zn present potential risks to human health.
中文关键词	污染 ; 绿洲土壤 ; Cd和Zn形态 ; 生物有效性
英文关键词	contamination oasis soil Cd and Zn form bioavailability
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY ; ENVIRONMENTAL SCIENCES
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
CSCD记录号	CSCD:3840421
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/2XILL650/225348
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	杨一鸣,南忠仁,赵转军,等. 干旱区污染绿洲土壤中Cd和Zn形态分布与生物有效性[J]. 兰州大学,2010,46(1):59-64.
APA	杨一鸣,南忠仁,赵转军,&王胜利.(2010).干旱区污染绿洲土壤中Cd和Zn形态分布与生物有效性.兰州大学学报. 自然科学版,46(1),59-64.
MLA	杨一鸣,et al."干旱区污染绿洲土壤中Cd和Zn形态分布与生物有效性".兰州大学学报. 自然科学版 46.1(2010):59-64.