中国边缘海沉积有机质来源及其碳汇意义

发布时间：2018-03-07 23:33

本文选题：中国边缘海　切入点：生物标志物　出处：《中国海洋大学学报(自然科学版)》2017年09期 　论文类型：期刊论文

【摘要】：中国边缘海(本文特指渤海、黄海和东海,不包括南海)是陆源和海源有机质的重要碳汇。总有机质指标和生物标志物的结果显示,表层沉积物中陆源有机质高值集中在近岸尤其是河口附近;海源有机质在陆架海盆处有高值,受控于海洋生产力和沉积环境。利用多参数指标对表层沉积物中不同来源和不同年龄有机质的贡献比例估算的结果显示,我国边缘海的有机碳埋藏量约13 Mt/a,占全球边缘海沉积物有机碳埋藏量(~138 Mt/a)的~10%,其中陆源有机质的碳埋藏量(3.9 Mt/a)占全球边缘海沉积物陆源有机质埋藏量的~7%。若假定陈化土壤有机质和古老有机质主要是陆源物质,则非现代有机质的碳埋藏量为~6Mt/a,占我国边缘海总有机质碳埋藏量的~46%,与全球边缘海沉积物中陆源有机质的平均比例(44%)相当。这些结果表明我国边缘海在全球海洋碳循环中具有重要地位。本文利用已发表的文献数据,总结和归纳了中国边缘海沉积有机质来源及其碳汇意义。
[Abstract]:Marginal seas in China (especially Bohai Sea, Huang Hai and East China Sea, excluding the South China Sea) are important carbon sinks for terrestrial and marine organic matter. The high value of terrestrial organic matter in surface sediments is concentrated near the shore, especially near the estuary, and the high value of marine organic matter is found in the shelf basin. Controlled by marine productivity and the sedimentary environment. Estimates of the proportion of contribution of organic matter from different sources and ages to surface sediments using multi-parameter indicators show that, The amount of organic carbon buried in marginal seas in China is about 13 Mt / a, accounting for 138Mt / a of the total organic carbon buried in marginal sea sediments of the world, and the carbon burying amount of terrestrial organic matter (3.9 Mt / a) accounts for 7% of the total buried amount of terrestrial organic matter in marginal sea sediments of the world. Aging soil organic matter and ancient organic matter are mainly land-based materials, The amount of carbon buried in non-modern organic matter is 6 Mt / a, which accounts for 46% of the total organic carbon buried in the marginal seas of China, which is equivalent to the average proportion of terrestrial organic matter in the sediments of the global marginal seas. These results indicate that the marginal seas of China are located in the global oceans. Carbon cycle plays an important role. The source of sedimentary organic matter and the significance of carbon sequestration in marginal seas of China are summarized and summarized.
【作者单位】：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;中国海洋大学海洋有机地球化学研究所;
【基金】：国家重点研发计划项目(2016YFA0601403) 国家自然科学基金项目(41520104009)资助~~
【分类号】：P736.21

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