中文摘要：

通过分析南黄海中部501个站位表层沉积物通沉积物有机质、粒度及常量元素特征，了解有机质分布特征及影响因素，并进一步对其中64个站位的进行气相色谱（Gc—FID）分析，探讨有机质分子组成。分析表明：南黄海中部总有机碳受水动力影响旱分布西低东高分布，总有机碳与AI2O3含量中值粒径依次相关特性；正构烷烃组成表明有机质主要来源于陆源高等植物，海洋浮游藻类贡献次之，陆源植物中草本植物与木本植物贡献相当，类异戊二烯烃反映_r短链正构烷烃明显海洋还原沉积环境；常龟元素与正构烷烃参数综合分析表明，南黄海中部陆源有机质主要来自于现代黄河、苏北占黄河输入，体现无机一有机综合分析对有机质物源判断；部分样品具有明显石油源输入特征，细菌对沉积物有机质贡献普遍存在。

英文摘要：

Approximately half of the woddg net annual photosynthesis occurs in the oceans （ -48 Pg C y-1）. Conti- nental margin support 10% - 15% of this production. Thus, continental margin seas play the critical role for the ener- gy conversion and carbon cycle in marine ecosystems. However, it is more difficulty to identify the source of these or- ganic matters because continental margin has been affected by both marine currents and terrestrial rivers. The Yellow Sea, a typical semi-enclosed epicontinental sea, rests on a flat, broad, and tectonically stable seafloor with water depth of average 55 m and maximum 100 m. The Yangtzi River and Yellow River around the Yellow Sea bear remark- ably different sizes, water, and sediment discharges; they were regarded to have governed the sediment of major parts of the Yellow Sea during Holocene. This paper is aimed to determine the source, behavior and composition of organic matters access to the understanding the characteristics in n-alkanes, total organic carbon, and elements. Another at- tempt to assess the sediment environment of organic matters and the approaches to discriminate differently sourced or- ganic. The 501 surface sediments from the central part of South Yellow Sea show in detail the characteristics and main factors of the organic matter based on the total organic carbon, grain size, and major elements. There are 64 samples from the above surface sediments detected by GC-FID to understand the molecular composition of organic matter in further. The study suggests that the total organic carbon are higher in the eastern part of this region than in the western part area, which affected by the background of the regional circulation patterns in the Yellow Sea, as there are posi- tive correction between the total organic carbon and the concentration of AlE O3, as well as the grain size （ median size）, although the former seemed more positive. Principal component analysis （PCA） based on correlation was per- formed using the individual n-alkane, as another too