Abstract: Core sediments in the Bohai have been analyzed to assess the sources and diagenesis of organic matter. Two sampling sites have been chosen: E3 and E5, which are located in the center of Bohai Bay. It is indicated that the most important organic source is the terrestrial matter transported by the Yellow River into the Bohai by analyzing the distribution of n-alkanes. The variation of H/L ration along the core could reflect the change of the Yellow River in the history. The observation of the reduced CPI value may suggest the dryness and dams over the Yellow River in these days. With the ratio of BrC_15∶0/nC_15∶0 and nC_18∶1/nC_18∶0 of fatty acids, it is elucidated that fatty acids could be easily degraded in the anoxic than the oxide environment.

Key words: Bohai, core sediment, n-alkanes, fatty acids

摘要： 本文测定了位于渤海中部的E3和E5两柱样中正构烷烃和脂肪酸的含量分布研究表明：渤海沉积物中有机质的重要来源是黄河的陆源物质输运，黄河的历史变迁在柱样中可通过轻重烃比值的变化记录体现。近年来黄河的断流和筑坝使得陆源物质的输入有明显的减少趋势。在讨论氧化环境(E5)和还原环境(E3)中脂肪酸的分布和行为中，脂肪酸作为较易改造降解的化合物，结合一些指标(BrC_15∶0/nC_15∶0和nC_18∶1/nC_18∶0参数)，表明在还原环境中的脂肪酸的降解过程明显于氧化环境。

关键词: 渤海, 柱状沉积物, 正构烷烃, 脂肪酸