Environmental changes reflected by sedimentary geochemistry in recent hundred years of Jiaozhou Bay, North China.
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.
Dai
Jicui
J
Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong 266071, China.
Song
Jinming
J
Li
Xuegang
X
Yuan
Huamao
H
Li
Ning
N
Zheng
Guoxia
G
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
D004785:Environmental Pollutants; D007856:Lead Radioisotopes; D019216:Metals, Heavy; D014131:Trace Elements; D014874:Water Pollutants, Chemical