大河影响下的陆架边缘海沉积有机碳的再矿化作用

姚鹏; 郭志刚; 于志刚

大河影响下的陆架边缘海沉积有机碳的再矿化作用

1.
中国海洋大学海洋化学理论与工程技术教育部重点实验室, 山东青岛 266100;中国海洋大学海洋有机地球化学研究所,山东青岛 266100
2.
复旦大学环境科学与工程系, 上海 200433

基金项目: 国家自然科学基金面上项目"不同来源有机碳在长江口-东海内陆架的水动力分选研究"(41176063)；国家自然科学基金重大国际(地区)合作研究项目"长江口及邻近海域底边界层生物地球化学过程研究"(40920164004)；国家自然科学基金创新研究群体项目"海洋有机生物地球化学(41221004)"。

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出版历程
- 收稿日期: 2013-01-22

Remineralization of sedimentary organic carbon in river dominated ocean margins

1.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, China;Institute of Marine Organic Geochemistry, Ocean University of China, Qingdao 266100, China
2.
Department of Environment Science and Engineering, Fudan University, Shanghai 200433, China

摘要

摘要: 大河影响下的陆架边缘海(RiOMars)是陆源有机碳的主要沉积汇，是陆海相互作用最重要的区域，在全球碳的生物地球化学循环中发挥着重要作用。受到RiOMars系统内频繁的物理和生物等改造作用的影响，该区沉积的有机碳并没有得到很好地保存而被永久埋藏，而是发生了显著的再矿化分解。本文首先对目前常用的基于O₂消耗速率和CO₂产生速率的两类测定RiOMars系统沉积有机碳再矿化速率的方法进行了介绍，分析了各自的优缺点和适用性，进而从碳的形态转化、表层沉积物混合均匀、形成次氧化的氧化还原条件、有机碳保存效率低、发生反风化作用和微生物发挥着重要作用等几个方面对RiOMars系统沉积物发生再矿化作用时的主要过程和特征进行了剖析，以期深入认识边缘海的再矿化作用及其对边缘海碳汇的影响。
- 大河影响下的陆架边缘海 /
- 沉积有机碳 /
- 再矿化作用 /
- 反风化作用 /
- 激发效应
Abstract: River dominated ocean margins (RiOMars) are the major depocenter of terrestrial organic carbon and are recognized as the most important zone for land-sea interactions, and play a very important role in global biogeochemical cycle of carbon. Effective remineralization of sedimentary organic carbon (SOC) occurs in these systems instead of efficient preservation and burial due to frequent physical and/or biological reworking of sediments in upper layer. In this paper, we introduced two kinds of commonly used methods for the determination of remineralization rate of SOC based on the consumption of O₂ and production of CO₂, respectively. Advantages, disadvantages and applicability of these methods were analyzed. In order to obtain a better understanding of the remineralization of SOC and its impact on carbon sink in continental margins, major processes and characteristics of the remineralization of SOC in RiOMars were summarized into several aspects including transformation of carbon forms, homogeneous vertical distribution of surface sediments, suboxic redox properties, low preservation of organic carbon, occurrence of "reverse weathering" and high microbial biomass.
- river dominated ocean margins /
- sedimentary organic carbon /
- remineralization /
- reverse weathering /
- priming effects

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参考文献(33)

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姚鹏, 于志刚, 郭志刚. 大河影响下的边缘海沉积有机碳输运与埋藏及再矿化研究进展[J]. 海洋地质与第四纪地质, 2013, 33(1): 154-160.

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Aller R C, Madrid V, Chistoserdov A, et al. Unsteady diagenetic processes and sulfur biogeochemistry in tropical deltaic muds: Implications for oceanic isotope

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