中国海洋大学学报（自然科学版）2018，Vol.48Issue(3)：104-113,10.DOI:10.16441/j.cnki.hdxb.20160341
渤海-北黄海表层沉积物中正构烷烃的组合特征及其指示意义的探讨
Study on the Indication of n-alkanes in Surface Sediments from the Bohai Sea and the North Yellow Sea
摘要
Abstract
The composition of n-alkanes is a powerful tool to study paleo-environment,but the research on the sources and indication of the low carbon number n-alkanes is still lacking in the Bohai Sea (BS) and the North Yellow Sea (NYS).Sedimentary n-alkanes have been widely used to discuss the distribution mechanism and sources of sedimentary organic matter.In this study,the composition and spatial distribution of C14～Casn-alkanes in 60 surface sediments from the BS and the NYS were studied.It was found that n-alkanes composition displayed a mono-modal with the long-chain C27,C29,C31 n-alkanes dominating and had a strong odd carbon preference in the BS and the NYS.The spatial distribution of carbon preference index of high carbon number n-alkanes (CPIhigh) showed that the dominant terrigenous input mainly deposit in the estuary.Alkane Index indicated tha terrigenous input of herbaceous plants and woody plants were similar in the whole area.In contrast,the average value of carbon preference index of low carbon number n-alkanes (CPIlow) was 0.9 with no obvious odd-even carbon preference,suggesting various sources of low carbon number n-alkanes and the influences of petroleum and its derivatives contamination on n-alkanes.Principal component analysis (PCA) indicated that spatial distributions of high carbon number n-alkanes and low carbon number n-alkanes were controlled by hydrological conditions and the sources of n-alkanes.The correlation analysis between the TOC normalized content of C27 +C29 + C31 n-alkanes ((C27 + C29 + C31)/TOC),the TOC normalized content of C15 + C17 + C19 n-alkanes ((C15+C17 +C19)/TOC) and the TOC normalized content of three kinds phytoplankton biomarkers (B+D+A/TOC) indicated that C27 +C29+C31n-alkanes derived from terrigenous plant while C15,C17,C19n-alkanes were not good marine biomarkers.In addition,the comparison of the degradation index (C26-OH/C29) and C15 +C17 +C19n-alkanes content showed that degradation was not the controlling factor of the distribution of C15,C17,C19n-alkanes.Future study needs to be done to confirm the sources and the indication of low carbon number n-alkanes in the study area.关键词
渤海-北黄海/表层沉积物/正构烷烃/指示意义Key words
the Bohai Sea and the North Yellow Sea/surface sediments/n-alkanes/indication分类
海洋科学引用本文复制引用
操云云,邢磊,王星辰,赵美训..渤海-北黄海表层沉积物中正构烷烃的组合特征及其指示意义的探讨[J].中国海洋大学学报（自然科学版）,2018,48(3):104-113,10.基金项目
国家重点研发计划项目(2016YFA0600904) （2016YFA0600904）
国家自然科学基金项目(41276068)资助 Supported by the National Key Programs for Fundamental Research and Development (2016YFA0600904) （41276068）
the National Natural Science Foundation of China (41276068) （41276068）
