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通过对长江口、杭州湾、舟山海域及东海陆架4个海区表层沉积物样品的粒度敏感组分分析,发现东海陆架与长江口具有相似的三级组分物质组成,杭州湾与舟山海域具有相似的两级组分物质组成。综合4个区域粒级组分分布特征,采用湿分法将4个海域表层沉积物样品分成6个粒级:<0.004 mm,0.004~0.025 mm,0.025~0.063 mm,0.063~0.125 mm,0.125~0.250 mm和>0.250 mm,分别提取各级组分和全样进行有机碳及同位素测试。定量分析各级组分有机碳含量、来源及物质组分,除杭州湾海域粗粒级外,基本上<0.004 mm的粘土组分有机碳含量最高;富集在杭州湾海域粗颗粒中的有机质主要来源于陆源植物碎屑。沉积物颗粒大小、物质组成类型是不同粒级有机质富集的主要控制因素。
Based on the analysis of the grain-size sensitive components of the surface sediment samples in the four sea areas of the Changjiang Estuary, Hangzhou Bay, Zhoushan Sea Area and the East China Sea Shelf, it is found that the East China Sea Shelf and the Yangtze Estuary have similar tertiary constituents, with similarities in Hangzhou Bay and Zhoushan Of the two components of the material composition. According to the characteristics of the distribution of the grain size fractions in the four regions, the sediment samples of the four sea areas were divided into six fractions by the wet method: <0.004 mm, 0.004-0.025 mm, 0.025-0.063 mm, 0.063-0.125 mm, 0.250 mm and> 0.250 mm respectively. The components and the whole samples were extracted for organic carbon and isotope tests. Quantitative analysis of organic carbon content, source and material components at all levels of components, in addition to the coarse-grained Hangzhou Bay waters, basically <0.004 mm clay component highest organic carbon content; enrichment of organic matter Mainly from terrestrial plant debris. Sediment particle size and composition type are the main controlling factors for the enrichment of organic matter in different grain fractions.