Bioaccumulation of heavy metals by submerged macrophytes: looking for hyperaccumulators in eutrophic lakes.
Bioaccumulation of heavy metals by submerged macrophytes: looking for hyperaccumulators in eutrophic lakes.
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DOI：
10.1021/es303923w
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发表时间：
2013-04
影响因子：
11.4
通讯作者：
W. Xing;Haoping Wu;Beibei Hao;Wenmin Huang;Guihua Liu
中科院分区：
文献类型：
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作者：
W. Xing;Haoping Wu;Beibei Hao;Wenmin Huang;Guihua Liu
为从野外直接筛选富集能力强的沉水植物，对长江中下游沿着24个富营养化湖泊进行了调查。由于人类活动的影响，这些富营养化湖泊的水体和沉积物中都含有大量的重金属。结果表明，Najas marina是As和Cd的超富集植物，Ceratophyllum demersum是Co、Cr和Fe的超富集植物，而苦草是Pb的超富集植物。沉水植物组织中重金属浓度之间存在较强的正相关性，可能是由于重金属的共积累作用。然而，对于大多数重金属，沉水植物与其周围环境之间没有显着的相关性。最后，N.马里纳角demersum和V.natans是去除富营养化湖泊中重金属的良好候选物种。
To directly select submerged macrophytes with high accumulation capability from the field, 24 eutrophic lakes along the middle and lower reaches of the Yangtze River were investigated in the study. These eutrophic lakes have large amounts of heavy metals in both water and sediments because of human activities. The results showed that Najas marina is a hyperaccumulator of As and Cd, Ceratophyllum demersum is a hyperaccumulator of Co, Cr, and Fe, and Vallisneria natans is a hyperaccumulator of Pb. Strong positive correlations were found between concentrations of heavy metals in tissues of submerged macrophytes, probably because of coaccumulation of heavy metals. However, for most heavy metals, no significant correlations were found between submerged macrophytes and their surrounding environments. In conclusion, N. marina, C. demersum, and V. natans are good candidate species for removing heavy metals from eutrophic lakes.