Environmental changes in Jiaozhou Bay of northern China during the past 90 years using metals and biogenic elements in sediments  

作　　者：Zhao-Hui Wang Xin Guo Ke Zhang Xin-Xin Lu 

机构地区：[1]College of Life Science and Technology,Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes,Jinan University,Guangzhou 510632,China

出　　处：《Journal of Environmental Sciences》2017年第3期301-312,共12页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41476132,41276154)

摘　　要：Metals and biogenic elements were analyzed from surface sediments and a 100 cm core collected from Jiaozhou Bay in July 2009, to determine how the environment has changed over the past 90 years due to increasing anthropogenic influences in this region. High concentrations of biogenic silica （BSi） represented the dominance of diatoms in the bay. Most metals were lower than the marine sediment quality guidelines; however, Hg, Zn, and Mn were at polluted levels. The vertical profiles of biogenic elements and metals in the sediment core suggest that the most significant environmental changes occurred since the 1990s, and three stages could be defined： （1） before 1950, characterized by low concentrations of biogenic elements and metals; （2） between 1950 and 1990, displaying an obvious increase of rig and a slow increase ofbiogenic elements; （3） after 1990, reflected by a significant increase of total organic carbon （TOG）, total nitrogen （TN）, total phosphate （TP）, and most metals, but a decrease of BSi. Correlation and principal component analyses indicated that most metals originated from lithogenic sources, industrial and domestic discharges as well as maricultural activities.Metals and biogenic elements were analyzed from surface sediments and a 100 cm core collected from Jiaozhou Bay in July 2009, to determine how the environment has changed over the past 90 years due to increasing anthropogenic influences in this region. High concentrations of biogenic silica （BSi） represented the dominance of diatoms in the bay. Most metals were lower than the marine sediment quality guidelines; however, Hg, Zn, and Mn were at polluted levels. The vertical profiles of biogenic elements and metals in the sediment core suggest that the most significant environmental changes occurred since the 1990s, and three stages could be defined： （1） before 1950, characterized by low concentrations of biogenic elements and metals; （2） between 1950 and 1990, displaying an obvious increase of rig and a slow increase ofbiogenic elements; （3） after 1990, reflected by a significant increase of total organic carbon （TOG）, total nitrogen （TN）, total phosphate （TP）, and most metals, but a decrease of BSi. Correlation and principal component analyses indicated that most metals originated from lithogenic sources, industrial and domestic discharges as well as maricultural activities.

关 键 词：MetalsBiogenic elementsSedimentsEnvironmental changesJiaozhou BayYellow Sea 

分 类 号：X55[环境科学与工程—环境工程]