Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.
Environ Sci Technol. 2013 May 7;47(9):4695-703. doi: 10.1021/es303923w. Epub 2013 Apr 26.
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.
为了直接从野外选择具有高积累能力的沉水植物，本研究调查了长江中下游的 24 个富营养化湖泊。这些富营养化湖泊由于人类活动，其水和沉积物中含有大量重金属。结果表明，菹草是砷和镉的超积累植物，金鱼藻是钴、铬和铁的超积累植物，苦草是铅的超积累植物。在沉水植物组织中重金属的浓度之间发现了强烈的正相关，这可能是由于重金属的共积累。然而，对于大多数重金属，沉水植物与其周围环境之间没有发现显著的相关性。总之，菹草、金鱼藻和苦草是从富营养化湖泊中去除重金属的候选物种。
