| 连云港近海沉积物重金属历史分布特征及其来源 |
| Analysis of the Historical Distribution and Sources of Heavy Metals in Sediments from the Lianyungang Sea |
| 投稿时间：2016-09-17 修订日期：2016-11-05 |
| DOI：10.15928/j.1674-3075.2016.06.009 |
| 中文关键词:沉积物 重金属 地积累指数 污染来源 连云港 |
| 英文关键词:sediments heavy metal index of geo-accumulation sources of contamination Lianyungang |
| 基金项目:国家自然科学基金项目（41306114）；2016江苏省青蓝工程；江苏省海洋生物技术重点实验室开放课题（2013HS008）；江苏省海洋科学与技术优势学科建设工程资助项目（5511201401X）. |
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| 中文摘要: |
| 分析连云港近海沉积物中的重金属含量，探讨不同功能区沉积物重金属污染演变规律、来源及其对环境造成的影响，为合理规划用海提供科学依据。选择连云港海域临洪河口河心浅滩、西连岛潮下带和灌河口北岸潮滩这3种不同的功能区为研究对象，于2014年在每个功能区各采集了1个沉积物柱状样，进行了测年和重金属Cd、Cr、Cu、Mn、Ni、Pb、Zn含量测定来分析重金属污染历史分布特征，并运用地累积指数和主成分分析说明了连云港近海不同功能区重金属污染水平和污染物来源。结果表明：1）20世纪90年代开始，各柱状样重金属污染水平出现明显的波动。2005年之后，临洪河口沉积物重金属污染水平呈现逐年下降趋势，灌河口沉积物重金属污染水平则呈波动上升趋势。2）根据地累积指数，连云港近海沉积物多数重金属污染水平处于轻度-中等污染水平，少数处于无污染状态或中等污染水平。3）重金属富集系数表明，沉积物中重金属污染受到人类活动的显著影响。相关性和主成分分析表明，临洪河口重金属来源较为多样，其次为连岛，灌河口重金属来源则较为单一。 |
| 英文摘要: |
| Core sediments have been proved to be an excellent tool for establishing the effects of anthropogenic and natural processes on depositional environments. Heavy metals in the sediments have received much attention and are important for environmental monitoring because of their persistence, accumulation, and the ecological risks they pose. Concentrations of heavy metals in coastal core sediments can be elevated due to high inputs from natural and anthropogenic sources. Industrial and urban activities have contributed to metal contamination of marine environments and have directly impacted coastal ecosystems. Thus, sediment cores obtained from those coastal areas provide a good chronological record of contamination. In 2014, three sediment core samples were collected from different functional zones (Linhong river mouth, Lian Island Sea and Guan river mouth) in the coastal area of the Lianyungang Sea. Sediment dating and concentrations of heavy metals (Cd, Cr, Cu, Mn, Ni, Pb and Zn) in the sediment cores were determined in order to construct the pollution history. The index of geoaccumulation (Igeo) and principal component analysis (PCA) were used to assess the pollution level and geochemical sources of the metals. Vertical distributions of heavy metals reflected different depositional environments in the different functional zones. Concentrations of seven metals in this study were higher than background levels reported in the literature. In the early 1990s, concentrations of heavy metals in three sediment core samples showed obvious fluctuations. After 2005, heavy metal pollution in sediment at the mouth of Linhong River displayed a declining trend year by year and an increasing trend in sediment at the Guan river mouth. In the Linhong river mouth, Igeo values reflect an unpolluted to moderately polluted sediment condition. The Igeo values for Lian Island Sea indicate no metal pollution to moderate metal pollution, except moderate Cr and Ni pollution in some years. In the mouth of Guan River, Igeo values show no Cr, Mn and Pb sediment pollution. For Cd, Cu and Ni, the quality of sediment was unpolluted to moderately polluted. No Zn pollution in sediment was recorded before 2008 and was unpolluted to moderately polluted after 2008. Enrichment factors for the heavy metals show that heavy metal pollution in sediments was influenced by human activities. Correlation analysis and principal component analysis show that the sources of heavy metals in sediment from Linhong river mouth were more diverse, followed by the Lian Island and primarily from a single source at the Guan river mouth. |
| 李玉,李宏观.2016.连云港近海沉积物重金属历史分布特征及其来源[J].水生态学杂志,37(6):59-67. |
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