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

康绪明; 宋金明; 袁华茂; 李学刚; 李宁; 段丽琴

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KANG Xuming,SONG Jinming,YUAN Huamao,LI Xuegang,LI Ning,DUAN Liqin.The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale[J].Acta Oceanologica Sinica,2017,36(11):68-78

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

The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale

投稿时间：2017-01-12 修订日期：2017-02-08

DOI：10.1007/s13131-017-1076-1

中文关键词: 有机质来源人类活动环境变化沉积物胶州湾

英文关键词:organic matter sources anthropogenic activities environmental changes sediments Jiaozhou Bay

基金项目:

作者	单位	E-mail
康绪明	中国科学院海洋研究所, 海洋生态与环境科学重点实验室, 青岛, 266071 青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室, 青岛, 266071
宋金明	中国科学院海洋研究所, 海洋生态与环境科学重点实验室, 青岛, 266071 青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室, 青岛, 266071 University of Chinese Academy of Sciences, Beijing 100049, China	jmsong@qdio.ac.cn
袁华茂	中国科学院海洋研究所, 海洋生态与环境科学重点实验室, 青岛, 266071 青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室, 青岛, 266071 University of Chinese Academy of Sciences, Beijing 100049, China
李学刚	中国科学院海洋研究所, 海洋生态与环境科学重点实验室, 青岛, 266071 青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室, 青岛, 266071 University of Chinese Academy of Sciences, Beijing 100049, China
李宁	中国科学院海洋研究所, 海洋生态与环境科学重点实验室, 青岛, 266071 青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室, 青岛, 266071 University of Chinese Academy of Sciences, Beijing 100049, China
段丽琴	中国科学院海洋研究所, 海洋生态与环境科学重点实验室, 青岛, 266071 青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室, 青岛, 266071 University of Chinese Academy of Sciences, Beijing 100049, China

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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。

英文摘要:

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).

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