黄渤海表层沉积物中正构烷烃和甾醇的分布及来源研究

摘要

The surface sediments at 64 sites in Yellow Sea and Bohai Sea were collected in 2008, and the concentrations and molecular compositions of lipid biomarkers (n-alkanes and sterols) were analyzed to determine the organic material sources of land and ocean input and comparethe spatial difference among sites. The results showed that, (1) the sediment organic material in the Yellow Sea was derived from both terrestrial plants and marine organism, although the terrestrial input dominated the source of organic material in northern Yellow Sea; the riverine import of terrestrial material contributed significantly to the Bohai Bay and Laizhou Bay, (2) terrestrial plant-derived sterols (such as campsterol, sitosterol and stigmasterol) displayed lower concentrations in the surface sediments of the Yellow Sea than in the Bohai and Laizhou Bay, while the brassicasterol which were mainly derived from diatom was abundant in all the study areas.%在黄海、渤海湾和莱州湾采集64个表层沉积物样品,分析正构烷烃(C15～C33)和甾醇(菜子甾醇、菜油甾醇、谷甾醇和豆甾醇)的质量分数和分子组合特征,探讨其来源,比较物质来源的空间差异.结果表明:(1)黄海表层沉积物中类脂生物标志物主要呈现陆源和海源共同影响的特征,其中北黄海以陆源输入为主,高碳数正构烷烃(＞C24)具有明显的奇碳优势,陆源高等植物的贡献较大;南黄海陆源输入与海洋自身贡献相当;渤海湾与莱州湾接受来自河流的大量陆源物质;(2)来源于陆源高等植物的甾醇(包括菜油甾醇、谷甾醇和豆甾醇)在黄海表层沉积物中的质量分数远小于渤海湾和莱州湾,但指示硅藻来源的菜子甾醇在整个研究区域均具有较高的质量分数.