title: Environmental changes reflected by sedimentary geochemistry in recent hundred years of Jiaozhou Bay, North China.
abstract: 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.
authors.affiliation: Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong 266071, China.
authors.forename: Jicui
authors.initials: J
authors.lastname: Dai
authors.forename: Jinming
authors.initials: J
authors.lastname: Song
authors.forename: Xuegang
authors.initials: X
authors.lastname: Li
authors.forename: Huamao
authors.initials: H
authors.lastname: Yuan
authors.forename: Ning
authors.initials: N
authors.lastname: Li
authors.forename: Guoxia
authors.initials: G
authors.lastname: Zheng
mesh_terms: D002681:China; D017753:Ecosystem; D004777:Environment; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D004787:Environmental Pollution / Q000009:adverse effects; D005068:Eutrophication; D019015:Geologic Sediments; D007221:Industry; D007856:Lead Radioisotopes / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis; D012623:Seawater / Q000737:chemistry; D014131:Trace Elements / Q000032:analysis; D014507:Urbanization; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D004785:Environmental Pollutants; D007856:Lead Radioisotopes; D019216:Metals, Heavy; D014131:Trace Elements; D014874:Water Pollutants, Chemical