杨钦川, 陈庆强, 姚振兴
华东师范大学河口海岸学国家重点实验室, 上海 200062

摘要:
通过对长江三角洲南翼最大淤涨带钻孔柱样进行沉积有机碳（POC）、有机碳同位素组成（δ¹³C）、总氮（TN）、粒度的测定，研究长江三角洲南翼盐沼有机质分布及来源。结果表明：POC、TN分布受控于长江入海泥沙及人类活动，有机质主要赋存于细颗粒物质中（<16 μm），长江入海泥沙偏粗，有机质含量降低，围垦导致物质组成趋向均一化。δ¹³C自陆向海方向增大，自陆向海盐沼陆相有机质比例下降，海相有机质比例上升。围垦活动使海相有机质比例上升，长江入海泥沙对盐沼发育影响力下降，但长江入海泥沙对盐沼发育仍起主导作用。此研究揭示流域水沙及人类活动对河口盐沼发育的影响，丰富海岸带研究资料。
关键词:盐沼有机质长江三角洲围垦
DOI：10.11759/hykx20180127001
分类号:P736.21
基金项目:国家自然科学基金项目（41471161）

Source and distribution of organic matter in salt marsh buried in south flank of the Yangtze River Delta
YANG Qin-chuan, CHEN Qing-qiang, YAO Zhen-xing
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Abstract:
Based on the determination of particulate organic carbon(POC)content, total nitrogen(TN)content, organic carbon isotope ratios(δ¹³C), and grain size with sediment drilling cores in the maximum siltation zone of the south flank of the Yangtze River Delta, the source and distribution of organic matter in salt marsh is investigated in this study. The results show that the distribution of organic matter in the salt marsh is controlled by the Yangtze River sediment load and reclamation. The organic matter is mainly concentrated in fine grain sediments. The coarse sediment from the Yangtze River results in the decline of w(POC), and w(TN). Reclamation leads to homogenization of material composition. The variation trend of δ¹³C value show increase from landward to seaward. The proportion of terrestrial organic matter decreases and marine organic matter increases from landward to seaward. The reclamation increases the chance of marine organic matter transportation into salt marsh. Although the influence of the Yangtze River on the development process of salt marsh has declined, the Yangtze River still controls the development process. This study reveals the impact of the Yangtze River sediment and human activity on salt marsh development and enriches the research of coastal zone.
Key words:salt marshorganic matterthe Yangtze River Deltareclamation





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