Environmental changes reflected by sedimentary geochemistry in recent hundred years of Jiaozhou Bay, North China

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• 作者：Jicui Dai ; Jinming Song ; Xuegang Li ; Huamao Yuan ; Ning Li ; Guoxia Zheng
• 关键词：Geochemical records ; Environmental changes ; Biogenic elements ; Trace metal ; Jiaozhou Bay sediments
• 刊名：Environmental Pollution
• 出版年：2007
• 出版时间：February 2007
• 年：2007
• 卷：145
• 期：3
• 页码：656-667
• 全文大小：413 K

文摘

Sediment geochemical technique was employed to assess how the sediment records reflect the environmental changes of Jiaozhou Bay, a semi-enclosed bay adjacent to Qingdao, China. In the past hundred years, Jiaozhou Bay has been greatly impacted by human interventions. A dated core sediment by ²¹⁰Pb chronology was analyzed for trace metals including Li, Cd, Cr, Pb, Cu, Ni, Co, Zn together with C, N, P and BSi. Based on the research, the development of Jiaozhou Bay environment in the past hundred years can be divided into three stages: (1) before the 1980s characterized by relatively low sedimentation rate, weak heavy metal pollution and scarce eutrophication; (2) from the 1980s to 2000, accelerating in the 1990s, during which high sedimentation rates, polluted by heavy metals and the frequent occurrence of red tide; (3) after 2000, the period of the improvement of environment, the whole system has been meliorated including the heavy metal pollution and hypernutrification.