| KANG Xuming,SONG Jinming,YUAN Huamao,LI Xuegang,LI Ning,DUAN Liqin. 2017. The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale. Acta Oceanologica Sinica, 36(11):68－78 |
| The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale |
| 胶州湾沉积物中有机质的来源与组成及其对百年尺度环境变化的指示 |
| Received:January 12, 2017 Revised:February 08, 2017 |
| DOI：10.1007/s13131-017-1076-1 |
| Key words:organic matter sources anthropogenic activities environmental changes sediments Jiaozhou Bay |
| 中文关键词: 有机质 来源 人类活动 环境变化 沉积物 胶州湾 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | KANG Xuming | Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China | | | SONG Jinming | Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
University of Chinese Academy of Sciences, Beijing 100049, China | jmsong@qdio.ac.cn | | YUAN Huamao | Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Xuegang | Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Ning | Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | DUAN Liqin | Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
University of Chinese Academy of Sciences, Beijing 100049, China | |
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| Abstract: |
| The Jiaozhou Bay is characterized by heavy eutrophication that is associated with intensive anthropogenic activities. Four core sediments from the Jiaozhou Bay are analyzed using bulk technologies, including sedimentary total organic carbon (TOC), total nitrogen (TN), the stable carbon (δ13C) and nitrogen (δ15N) isotopic composition to obtain the comprehensive understanding of the source and composition of sedimentary organic matter and further shed light on the environmental changes of the Jiaozhou Bay on a centennial time scale. Results suggest that the TOC and TN concentrations increase in the upper core, having indicated a probable eutrophication process since the 1920s in the inner bay and the 2000s in the bay mouth. The TOC and TN concentrations outside the bay have also changed since 1916 owing to the variation of terrigenous input. Considering TOC/TN ratio, δ13C and δ15N, it can be concluded there is a mixture of terrigenous and marine organic matter sources in the study area. A simple two end-member (terrigenous and marine) mixing model using δ13C indicats that 45%-79% of TOC in the Jiaozhou Bay is from the marine source. The environmental changes of the Jiaozhou Bay are recorded by geochemical proxies, which are influenced by the intensive anthropogenic activities (e.g., extensive use of fertilizers, and discharge of sewage) and climate changes (e.g., rainfall). |
| 中文摘要: |
| 胶州湾因受人类活动的影响而表现为严重的富营养化。本文通过分析胶州湾四根柱状沉积物的TOC，TN，δ13C与δ15N来研究有机质的来源与组成，从而理解胶州湾百年尺度的环境变化。结果显示，TOC和TN的含量在柱状样的上层呈现增加的趋势，指示了湾内和湾口分别自1920s年及2000s开始呈现潜在的富营养化。由于陆源输入的影响，湾外区域的TOC与TN自1916年也发生了变化。通过碳氮比，碳、氮同位素（δ13C与δ15N）的分析表明，胶州湾的有机质来源为陆源与海源的混合。通过δ13C的二端元混合模型计算出海源有机碳所占的比例为45-79%。胶州湾的环境变化被地化代理所记录，反映了密集的人类活动（如化肥的广泛使用以及污水排放）以及气候变化（如降雨）的影响。 |
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