期刊
JOURNAL OF ENVIRONMENTAL BIOLOGY
卷 38, 期 4, 页码 561-570出版社
TRIVENI ENTERPRISES
DOI: 10.22438/jeb/38/4/PRN-129
关键词
Ecological risk assessment; Heavy metals; Lake Poyang; Nanjishan wetlands; Surface sediments
资金
- National Natural Science Foundation of China [51369024, 51469017, 51579127]
- Ministry of Water Resources [201401039]
- Jiangxi Provincial Technology Department [20142BBF60012, 20142BAB213024, 20133DDH80028]
- Key Laboratory of Water Science and Engineering, Nanjing Hydraulic Research Institute [YK914014]
- Water Resource and Eco-system Environmental Research Center for Poyang Lake, Ministry of Water Resources [KFJJ201401]
Aim: The land between aquatic and terrestrial systems is defined as wetland where heavy metals accumulate and deposit in sediments more easily due to natural as well as anthropogenic activities. The main objective of the present study was to investigate the distribution characteristics, pollution degree and potential source of heavy metals in the surface sediments of Nanjishan Wetland Nature Reserve. Methodology: Surface sediments samples from three representative shallow lakes (Lake Nanshen, Lake Dong and Lake Chang) were collected, and heavy metals were estimated in terms of content characteristics, spatial features and correlations. Integrated pollution indexs (PI and IPI), geoaccumulation indices (Igeo) combined with geostatistical methods were used to calculate the degree of heavy metals, evaluate the ecosystem risks and identify the potential sources. Results: Indicators like PI, IPI and Igeo indicated that heavy metals in research areas exist widely and were mainly dominated by Zn, Pb, Cd and Cr at higher concentration than the permissible limit standards. Statistical analysis revealed two main sources of pollutants; first due to discharge of mixed-origin domestic wastewater emissions and other due to terrigenous? sediments. Interpretation: Human activities, such as traffic, aquaculture, municipal and industrial wastewater and hydrological exchange can significantly influence the spatial variation of heavy metals in wetlands.
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