东海内陆架泥质区北部沉积物有机碳分布及60年来埋藏量
Distribution and Burial in the Last 60 Years of Organic Carbon in the Sediment of Northern Area of the Muddy Sediment Zone on the Inner-Shelf of the East China Sea
摘要: 根据东海内陆架北部海域表层和柱状样沉积物实测资料，对研究区有机碳的含量、分布、来源和影响因素进行分析研究，结果表明研究区TOC和C/N平均值分别为0.53%和7.14，平面分布显示了有机质易与细颗粒沉积相伴共生的特征，有机碳分布的粒度控制特点在柱状样剖面分布中表现得更加明显。水动力驱动的粒度分异对有机碳在研究区沉积物中的迁移和积累具有重要的控制作用，其分布和埋藏还受到沉积环境的影响。研究区有机碳为陆源和海源混合源，简单二端元模式判定陆源有机碳的贡献比为17.3%~70.6%，受到局部区域沉积环境的影响较大。结合137Cs和210Pb测年方法得到精确的沉积速率，计算结果显示研究区有机碳埋藏速率在30~70 t/km2/yr之间，年埋藏通量约为1.34 × 106 t/yr，处于相当高的水平。研究区海底沉积物中60年来有机碳的埋藏总量约为82.2 × 106 t，成果可为大区域碳封存和碳循环的研究提供局部典型区域的资料和依据。
Abstract: Based on the sampling and laboratory testing data of surface and core sample sediments in the northern area of the East China Sea inner shelf, the content, distribution, source and influencing factors of organic carbon in the study area were studied, the results showed that the average values of TOC and C/N in the study area were 0.53% and 7.14, respectively, and the distribution characteristics showed that organic matter is easy to be accompanied by fine-grained sedimentation, and the grain-size control feature of organic carbon distribution were more obvious in the distribution of the core sample profiles. The grain size differentiation driven by hydro-dynamics has an important role in controlling the migration and accumulation of organic carbon in the sediments of the study area, and its distribution and burial are also influenced by the depositional environment. The organic carbon in the study area is a mixed source of terrestrial and marine sources, and the simple two-end-model determines that the contribution ratio of terrestrial organic carbon ranges from 17.3% to 70.6%, which is greatly influenced by the local regional depositional environment. Combining the 137Cs and 210Pb dating methods to obtain accurate sedimentation rates, the calculation results show that the burial rate of organic carbon in the study area ranges from 30~70 t/km2/yr, and the annual burial flux is about 1.34 × 106 t/yr, which is at a fairly high level. The total amount of buried organic carbon in the seafloor sediments of the study area over the past 60 years is about 82.2 × 106 t. The results can provide information of a typical local area for the study of carbon sequestration and carbon cycling in a large region
文章引用：李金铎, 蒋叶娟, 段悦, 施兴安, 戴益鸿, 王哲. 东海内陆架泥质区北部沉积物有机碳分布及60年来埋藏量[J]. 海洋科学前沿, 2025, 12(4): 222-230. https://doi.org/10.12677/ams.2025.124023

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