Heavy metals in water, sediments and submerged macrophytes in ponds around the Dianchi Lake, China
Heavy metals in water, sediments and submerged macrophytes in ponds around the Dianchi Lake, China
复制标题
中国滇池周边池塘水体、沉积物和沉水植物中的重金属
DOI：
10.1016/j.ecoenv.2014.06.002
复制
发表时间：
2014
影响因子：
6.8
通讯作者：
Liu Wenzhi
中科院分区：
文献类型：
--
作者：
Wang Zhixiu;Yao Lu;Liu Guihua;Liu Wenzhi
湖泊周围的池塘通过截留径流和污染物（如来自周围景观的重金属），在减轻人类活动对湖泊生态系统的影响方面发挥着重要作用。为了确定沉水植物积累重金属的潜力，我们调查了10种重金属（即，对滇池周边37个池塘水体、沉积物和沉水植物中As、Cd、Co、Cr、Cu、Fe、Mn、Ni、Pb和Zn的含量进行了测定。结果表明，这些池塘的水体和沉积物均受到Pb的污染。接受城市和农业径流的池塘水和沉积物中重金属浓度并不显著高于接受森林径流的池塘。这一结果表明，这些池塘中的重金属很大一部分可能来自大气沉积和背景土壤的风化。沉水植物中重金属含量之间存在正相关关系，可能是由于重金属的共积累作用。对于大多数重金属，沉水植物与其水和沉积物环境之间没有显着的关系。金鱼藻中Cr、Fe和Ni的最大含量分别为4242、16、429和2662 mg kg−1。结果表明，C.因此，淡水菱角是一种很好的去除重金属污染水体的候选物种。
Through retaining runoff and pollutants such as heavy metals from surrounding landscapes, ponds around a lake play an important role in mitigating the impacts of human activities on lake ecosystems. In order to determine the potential for heavy metal accumulation of submerged macrophytes, we investigated the concentrations of 10 heavy metals (i.e., As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) in water, sediments, and submerged macrophytes collected from 37 ponds around the Dianchi Lake in China. Our results showed that both water and sediments of these ponds were polluted by Pb. Water and sediments heavy metal concentrations in ponds received urban and agricultural runoff were not significantly higher than those in ponds received forest runoff. This result indicates that a large portion of heavy metals in these ponds may originate from atmospheric deposition and weathering of background soils. Positive relationships were found among heavy metal concentrations in submerged macrophytes, probably due to the coaccumulation of heavy metals. For most heavy metals, no significant relationships were found between submerged macrophytes and their water and sediment environments. The maximum concentrations of Cr, Fe and Ni inCeratophyllum demersumwere 4242, 16,429 and 2662 mg kg−1, respectively. The result suggests thatC. demersumis a good candidate species for removing heavy metals from polluted aquatic environments.