| 应用有机碳同位素技术研究湛江湾生态环境的变化过程 |
| Study on the change process of ecological environment in Zhanjiang Bay through organic carbon isotope technique |
| 投稿时间：2019-09-11 修订日期：2019-09-28 |
| DOI： |
| 中文关键词: 有机质来源 碳氮比值 碳同位素 富营养化 |
| 英文关键词:Source of organic matter C/N ratio carbon isotope eutrophication |
| 基金项目:国家自然科学基金(41903067)；广东省教育厅创新强校项目(230419079),第一作者：曹瀚升(1988—),男,博士,主要研究同位素地球化学。 E-mail: chsheng72@163.com 通讯作者：贺文同(1989—),男,博士,主要研究沉积环境。 E-mail: Hewentong0510@163.com ,2 ,张振鹏1 ,贺文同3 ,黄鑫1,2 ,蒲晓强1,2 |
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| 中文摘要: |
| 随着工业化进程的加快，湛江湾的生态环境承载力受到了极大的考验。为了解湛江湾生态环境的变化过程，本文利用湛江湾表层柱状沉积物样品中总有机碳含量（TOC）及其稳定同位素、总氮含量（TN）和C/N值的测定，结合端元混合模型，分析了湛江湾沉积物中有机质的来源，探讨了沉积物有机碳同位素的主要影响因素。结果表明，湛江湾沉积物中有机质主要来源自自生藻类，同时也受一定程度陆源输入的影响。沉积序列的元素地球化学参数表明，沉积物?13C值呈现短暂的负偏随后长期正偏的趋势。底部的负偏可能与大气CO2浓度增加有关，随后?13C主体正偏的趋势主要受控于气候转暖、生产力增加以及富营养化程度增加的共同影响，暗示了人类活动对湛江湾的生态环境的影响逐渐加剧。其中，人类活动有关的工、农业排放有机污染物可能是不断加剧海水的富营养化的主要原因 |
| 英文摘要: |
| With the acceleration of industrialization, the carrying capacity of ecological environment in Zhanjiang Bay has been greatly tested. To understand the change process of the ecological environment in Zhanjiang Bay, this study used total organic carbon content (TOC) and its stable isotopes, total nitrogen content (TN) and C/N in the surface columnar sediment samples of Zhanjiang Bay, combined with the end-element mixed model, to analyze the source of organic matter in the sediments of Zhanjiang Bay and the main influencing factors of organic carbon isotopes in the sediments. The results show that the organic matter in the sediments of Zhanjiang Bay mainly comes from authigenic algae and is also affected by terrestrial input to a certain extent. The element geochemistry parameters in sedimentary sequence show a short negative excursion in ? 13C followed by an increasing trend of ?13C value. The negative excursion at the bottom of the section may be related to an increase in the atmospheric CO2 concentration. The positive excursion in the ?13C value is mainly controlled by the combined effects of climate warming, productivity increase and eutrophication degree, which indicates that the influence of human activities on the ecological environment of Zhanjiang Bay is gradually aggravated. Among them, organic pollutants emissions from industrial and agricultural discharge related to human activities may be the main reason for increasing the eutrophication of the sea water |
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