东海内陆架有机碳的源—汇过程及其沉积记录

大陆边缘海是不同来源、不同性质有机碳沉积和埋藏的主要场所，在全球碳的生物地球化学循环过程中具有重要地位。东海内陆架接收大量陆源有机碳，并且具有较高的海洋生产力，是研究沉积有机碳来源、输运和埋藏的理想场所，已取得大量研究成果。在对相关文献进行系统整理的基础上，以沉积学的视角对前人研究成果进行了梳理，旨在为后续相关研究提供参考。全样分析（如TOC/TN、δ13C等）和生物标志化合物（如正构烷烃、甾醇类、木质素等）方法揭示东海内陆架有机碳的来源受沉积环境影响，由海向陆方向陆源组分整体显著增加，并具有季节性特征。东海内陆架沉积物在沿岸方向具有“夏储冬输”的宏观输运格局，该动力过程影响着陆源有机碳沿岸的输运路径和最终归宿；在东海29° N附近存在一个“舌形”的跨陆架输运通道，可能会存在陆源有机碳的跨陆架输运，影响深海有机碳的源—汇过程；另外，人类活动和极端气候事件也显著影响东海内陆架沉积物和有机碳的沉积过程和沉积记录，需要进一步研究。东海内陆架泥质区是陆源有机碳的重要埋藏区域，其埋藏效率受区域沉积有机碳含量和沉积速率控制，并与早期成岩过程中有机质矿化路径有关。沉积物中埋藏有机碳的地球化学特征可以用来重建长时间尺度的海平面变化、初级生产力、古海洋和古气候演化等，相关研究为理清东海内陆架地质历史时期的环境演化提供了依据。

Source-to-Sink Process of Organic Carbon on the Inner Shelf of the East China Sea and its Sedimentary Records

Continental marginal seas are the main sites for deposition and burial of organic carbon from different sources with different properties， and they play an important role in the global biogeochemical carbon cycle. The inner shelf of the East China Sea （ECS） accepts a large amount of terrestrial organic carbon with high primary productivity and is an ideal site for the study of the source， transport and burial of sedimentary organic carbon. This comprehensive analysis of the literature gives a brief review of related sedimentological studies， with the aim of providing references for future research. Bulk analyses （TOC/TN， δ13C， etc.） and biomarkers （n-alkanes， sterols， lignin， etc.）， among other methods， have indicated that the source of organic carbon in this location is affected by the sedimentary environment. The terrestrial components increase significantly landward from the sea and have seasonal characteristics. The inner shelf sediments of the ECS have a macroscopic transport characteristic best described as "storing in Summer and transporting in Winter" along the coast, and this dynamic process affects the coastal transport path and final destination of terrestrial organic carbon. There exists a "tongue?shaped" zone of transported terrigenous organic carbon near latitude 29°N in the ECS, which may be accompanied by cross?shelf transport of terrestrial organic carbon, affecting the source?sink process of deep?sea organic carbon. In addition， human activity and extreme climatic events have also significantly affected the records of the deposition processes of the sediment and organic carbon； such factors need further study. The inner shelf of the ECS is an important area of buried terrigenous organic carbon. Its burial efficiency has been influenced by the source， the content and the sedimentation rate， and is related to the mineralization path of the organic matter during the early diagenetic process. The geochemical characteristics of the organic carbon contained in the sediments are also useful for reconstructing long-term sea-level change， primary productivity， paleoceanography and paleoclimate evolution， thus providing a basis for clarifying the environmental evolution of the ECS inner shelf during its geological history.