东海近岸表层沉积物中正构烷烃的组成、分布及来源分析

doi:10.13634/j.cnki.mes20160312

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摘要本文对东海近岸的19个表层沉积物样品中正构烷烃的分布及其组成特征进行分析。结果表明,该调查站位表层沉积物中正构烷烃均呈双峰群分布,前峰群短链烷烃无明显奇偶优势,主要来源于海洋藻类和细菌;后峰群长链烷烃具有明显的奇碳数优势,主要来源于陆生高等植物。短链和长链烷烃分布均呈现中间高两端低的分布趋势,这可能与沉积物的粒度有关,粒度越小越易吸附有机质,造成了海源和陆源都在中部出现高值。陆、海源烷烃比(ΣT/ΣM)和陆、海源烷烃优势比(TAR)对沉积有机质来源的指示是一致的,空间分布呈现近舟山群岛有高值分布,指示有较强的陆源输入。陆海比(P_mar-aq)、平均链长(ACL)、烷烃指数(AI)、奇偶优势指数(OEP)指示研究海区主要以陆源输入为主且草本植物和木本植物的输入比例相近且没有受到石油污染。

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	李凤
	徐刚
	贺行良
	陈立雷
	王江涛

关键词：表层沉积物正构烷烃组成来源

Abstract：In this study, the distribution and composition of n-alkanes in 19 surface sediments from the coast of East China Sea were analysed. The results indicate that n-alkanes in surface sediments from the Zhoushan Island mostly display bimodal distributions. The shorter chain n-alkanes have no obvious odd-even predominance, mainly derived from marine phytoplankton and microbes. The longer chain n-alkanes have a strong odd over even predominance, mainly produced by terrestrial. The shorter and longer chain n-alkanes have a similar distribution trend with high contents in central part of the study area, it maybe related to stronger adsorption of organic matter on fine grained sediments. Both the n-alkanes content ratio of terrestrial to marine (ΣT/ΣM) and the content ratio of terrestrial to marine dominant n-alkanes (TAR) have consistent distribution patterns, the spatial distribution have the high values of ΣT/ΣM and TAR in nearshore Zhoushan Island, indicating strong terrestrial inputs. P_mar-aq、ACL、AI、OEP vaules indicated mainly produced by terrestrial higher plants containing about equal amounts of grass and woody plants in the study area and not find the polluted by oil.

Key words： surface sediment N-alkanes composition sources

收稿日期: 2015-05-12;

PACS:

基金资助:

国家自然科学基金(41406078);中国地质调查局地址调查项目(GZH201200506)

作者简介:李凤(1988-),女,山东菏泽人,硕士研究生,主要从事海洋地球化学方面研究,E-mail:lifeng19881003@yeah.net

引用本文:

李凤,徐刚,贺行良等. 东海近岸表层沉积物中正构烷烃的组成、分布及来源分析[J]. 海洋环境科学, 2016, 35(3): 398-403.

LI Feng,XU Gang,HE Xing-liang et al. Composition, distribution and source of N-alkanes in surface sediments from the coast of East China Sea[J]. Marine Environmental Science, 2016, 35(3): 398-403.

链接本文:

http://hyhjkx.nmemc.org.cn/CN/10.13634/j.cnki.mes20160312 或 http://hyhjkx.nmemc.org.cn/CN/Y2016/V35/I3/398

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