A geochemical record of environmental changes in sediments from Sishili Bay,northern Yellow Sea,China: Anthropogenic influence on organic matter sources and composition over the last 100 years |
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| Institution: | 1. College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, PR China;2. Guangdong Provincial Public Laboratory of Analysis and Testing Technology, China National Analytical Center (Guangzhou), Guangzhou 510070, PR China;1. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 17 Chunhui Road, Yantai City, Shandong Province, China;2. Shandong Marine Resource and Environment Research Institute, 216 Changjiang Road, Yantai City, Shandong Province, China;3. Ludong University, 186 Red Flag Middle Road, Yantai City, Shandong Province, China;4. University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing City, China |
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| Abstract: | Total organic carbon (TOC), total nitrogen (TN), δ13C and δ15N were measured in sediment cores at three sites in Sishili Bay, China, to track the impacts of anthropogenic activities on the coastal environment over the last 100 years. The increased TOC and TN in the upper section of sediment cores indicated a eutrophic process since 1975. In comparison, the TOC and TN in the sediment core near to a scallop aquaculture area displayed a much slower increase, indicating the contribution of scallop aquaculture in mitigating eutrophication. Combined information from δ13C, δ15N and TOC:TN indicated an increased terrestrial signal, although organic matter sources in Sishili Bay featured a mixture of terrestrial and marine sources, with phytoplankton being dominant. Increased fertilizer use since 1970s contributed to the eutrophic process in Sishili Bay since 1975, and increased sewage discharge from 1990s has added to this process. |
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| Keywords: | Anthropogenic influence Organic matter sources Marine sediment Geochemical indicator Sishili Bay |
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