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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。
In this paper, the distribution and composition of n-alkanes in 19 surface sediment samples from the coast of the East China Sea were analyzed. The results show that the n-alkanes in the surface sediments of the survey site have a bimodal distribution, while the former short-chain paraffins have no obvious even-odd predominance, mainly from marine algae and bacteria; the latter peak group long paraffins have obvious odd carbon Number advantage, mainly from terrestrial higher plants. The short-chain and long-chain alkanes show a low distribution trend at the middle and upper ends, which may be related to the grain size of sediments. The smaller the size, the easier it is to adsorb organic matter, resulting in high values of both sea and land sources in the middle. Land and sea source alkane ratio (ΣT / ΣM) and land and sea source alkane favorable ratio (TAR) are consistent with the indication of source of sedimentary organic matter. The spatial distribution shows the high value distribution of the recent Zhoushan archipelago, which indicates that there is strong terrestrial input. (P_ (mar-aq)), average chain length (ACL), alkane index (AI) and even-dominant index (OEP) indicated that the study area mainly dominated by terrestrial input and the input proportion of herbaceous plants and woody plants Similar and not oil-contaminated.