RESEARCH PROGRESS IN TRANSPORT, BURIAL AND REMINERALIZATION OF ORGANIC CARBON AT LARGE RIVER DOMINATED OCEAN MARGINS
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摘要: 大河影响下的边缘海是陆源输入物质的主要储库,也是有机碳埋藏和再矿化的主要场所,在全球碳的生物地球化学循环中有着重要作用。从有机碳的输运、埋藏和再矿化等方面综述了大河影响下的边缘海沉积有机碳生物地球化学研究的最新进展。研究表明,有机碳的来源、组成、粒径和密度分布等显著影响着有机碳的分布特征和归宿,大河影响下的边缘海中移动泥等特殊沉积环境在有机碳的输运、埋藏和再矿化分解等方面发挥了独特的作用;微生物分解作用则是边缘海沉积有机碳,特别是难降解陆源有机碳发生分解的重要因素。综合运用分子生物学、有机地球化学、生物地球化学等多学科研究手段,深入研究特定微生物、浮游生物功能类群等在大河影响下的边缘海沉积有机碳生物地球化学过程中的作用,将极大地丰富对河口和陆架边缘海生源要素生物地球化学循环的认识。Abstract: Large-river dominated ocean margins (RiOMars) are, as a major repository of terrestrial materials and one of the most important active sites for burial and remineralization of organic matter on the Earth's surface, play an important role in global biogeochemical cycles of carbon. The research advances in biogeochemistry of sedimentary organic carbon (SOC) in RiOMars were reviewed in this paper concernings of transport, burial and remineralization of organic carbon. The nature of SOC, e.g. sources, composition, size and density fractions can significantly influence its distribution and fate in margin systems. The special sedimentation environment in RiOMars, for example the mobile muds, plays a unique role in organic carbon transport, burial and remineralization. Microbial metabolism enhances the decay of SOC, especially the refractory terrestrial organic materials in the margins. Comprehensive studies based on integrated techniques of molecular biology, organic geochemistry and biogeochemistry are helpful to reveal the role of special microbial and phytoplankton functional types in biogeochemical cycles of SOC in RiOMars, and to understand the biogeochemical cycles of biogenic elements in estuaries and continental margins.
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