Zi Xin-Yuan, Zhang Ming, Gu Xiao-Hong, Kan Ke-Cong, Mao Zhi-Gang, Chen Hui-Hui, Zeng Qing-Fei
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2021 Nov 8;42(11):5355-5363. doi: 10.13227/j.hjkx.202012131.
In order to explore the concentrations of heavy metals and the influence of fencing on Hongze lake, the content, source, and spatial distribution characteristics of heavy metals in surface sediments and ecological risks were analyzed in 2018 after part of the fence around Hongze Lake was removed. The results showed that the average contents of Cr, Ni, Cu, Zn, As, Cd, and Pb in the surface sediments in Hongze Lake were 66.78, 33.89, 25.35, 74.77, 16.55, 0.23, and 27.20 mg·kg, respectively. Cr, Ni, Cu, Zn, and Pb contents were at non-polluting levels, with As and Cd at the lowest level, based on the accumulation index evaluation. Except for Cd, all the elements showed low potential ecological risk. The results showed that the heavy metal content in the fenced, dismantled, and peripheral areas increased and accumulated towards the center of the lake. The removal of the fence did not significantly reduce the heavy metal content in the short-term. Overall, Hongze Lake presented a state of low ecological risk. In the future, environmental policies should include surface sediment accumulation areas and fencing culture in the north and northeast of Hongze Lake.
为探究重金属浓度及围栏对洪泽湖的影响，2018年在洪泽湖部分围栏拆除后，分析了表层沉积物中重金属的含量、来源、空间分布特征及生态风险。结果表明，洪泽湖表层沉积物中Cr、Ni、Cu、Zn、As、Cd和Pb的平均含量分别为66.78、33.89、25.35、74.77、16.55、0.23和27.20mg·kg。基于累积指数评价，Cr、Ni、Cu、Zn和Pb含量处于无污染水平，As和Cd处于最低水平。除Cd外，所有元素均显示出低潜在生态风险。结果表明，围栏区、拆除区和周边区域的重金属含量向湖心增加并累积。短期内，围栏拆除并未显著降低重金属含量。总体而言，洪泽湖呈现低生态风险状态。未来，环境政策应涵盖洪泽湖北部和东北部的表层沉积物堆积区及围栏养殖。
