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近岸海域是区域源汇过程的汇,记载了区域环境演变的重要信息.2010年在海州湾潮滩采集得到4个沉积物柱样,对沉积物柱样进行了重金属元素测定,结合核素210Pb测年结果,研究了海州湾潮滩重金属污染历史及人类活动对其影响.运用Al元素作为粒度的代用指标对重金属进行标准化,并获取了重金属富集系数和人为污染的重金属通量.研究表明,粒度控制效应并不是影响海州湾潮滩地区重金属分布的最主要因素,并且各重金属元素之间具有良好的相关性,说明该区域重金属元素具有来源一致性;海州湾潮滩沉积物中除重金属Cr和Cu表现为弱富集外,其他重金属元素Cd、Cr、Cu、Mn、Pb和Zn均表现为强富集,并且表层沉积物中重金属含量均高于该区域的背景值,这表明近50年以来,海州湾潮滩已明显受到人类污染源的影响,从而造成沉积物中重金属不断富集累积;自20世纪50年代至2000年初海州湾潮滩沉积物中人为污染活动输入的重金属通量呈现出波动增加的趋势,这种变化特征与区域社会、经济发展阶段相吻合;而从2005年以来随着区域产业结构优化调整,环境监管力度加强,潮滩沉积物中人为来源的重金属通量呈现出减少的趋势.
The near-shore sea area is a sink of regional source and sink processes, and records important information about the evolution of regional environment. In 2010, four sediment samples were collected from the tidal flat of Haizhou Bay. Heavy metal elements were measured on sediment samples. Su-210Pb was used to study the heavy metal pollution history and human activities of the tidal flat in Haizhou Bay.The Al element was used as a proxy index for the standardization of heavy metals, and the heavy metal enrichment coefficient and the anthropogenic heavy metal flux The results show that the grain size control effect is not the most important factor affecting the distribution of heavy metals in the tidal flat area of Haizhou Bay, and there is a good correlation between the heavy metal elements, which indicates that the heavy metal elements in this area have the same source. In addition to the heavy metals Cr and Cu showed weak enrichment in sediments, the other heavy metal elements Cd, Cr, Cu, Mn, Pb and Zn showed strong enrichment, and the surface sediment heavy metal content were higher than the background of the region This indicates that the tidal flat of Haizhou Bay has obviously been affected by human pollution sources in the recent 50 years, resulting in the continuous accumulation and accumulation of heavy metals in the sediments. Since the 1950s to 200 The heavy metal fluxes input into the man-made pollution activities in the sediments of the Haizhouwan tidal flat at the beginning of 2008 showed a trend of increasing fluctuations. These changes are consistent with the social and economic development stages in the region. Since 2005, with the optimization of the regional industrial structure Adjustments and intensification of environmental regulation have led to a decrease in anthropogenic heavy metal flux in tidal flat sediments.