东海近岸表层沉积物中脂肪酸与脂肪醇的组成以及分布与来源

发布时间：2018-07-21 11:16

【摘要】：选取了19个东海近岸表层沉积物样品,通过GC-MS分析获得脂肪酸和脂肪醇的特征信息,并结合统计学方法,探讨了调查海区的有机碳来源。结果表明,东海近岸沉积物中脂肪酸的含量为11.58~31.58μg/g,由正构饱和脂肪酸(SFAs)、一元不饱和脂肪酸(MUFAs)、多元不饱和脂肪酸(PUFAs)及支链脂肪酸(BrFAs)组成。高含量的C12:0—C20:0短链脂肪酸和较丰富的异构脂肪酸以及其他细菌标志脂肪酸的出现表明,海洋微藻-细菌源是脂肪酸的主要贡献者,而陆源脂肪酸的贡献仅占次要位置。脂肪酸的主成分分析结果表明,东海沉积物脂肪酸的全部信息可由海洋微藻-细菌源(PC1)和陆源(PC2)来反映。PC1的贡献率为75.4%,PC2的贡献率为11.9%。表层沉积物中烷基醇主要来源于陆地高等植物,各断面显示离岸越远陆源输入的烷基醇越少。菜子甾醇-甲藻甾醇的比例显示甲藻在研究海区为优势种,离岸越远,菜子甾醇的比例越高,这可能与上升流和台湾暖流带来丰富的营养盐有关。
[Abstract]:The characteristic information of fatty acids and fatty alcohols were obtained by GC-MS from 19 samples of surface sediments in the East China Sea and the sources of organic carbon in the investigated sea area were discussed by statistical method. The results show that the fatty acid content in the coastal sediments of the East China Sea is 11.58 ~ 31.58 渭 g / g, consisting of normal saturated fatty acids (SFAs), mono-unsaturated fatty acids (MUFAs), polyunsaturated fatty acids (PUFAs) and branched fatty acids (BrFAs). The presence of high content of C12: 0-C20: 0 short chain fatty acids, abundant iso-fatty acids and other bacterial marked fatty acids indicates that marine microalgae-bacterial sources are the main contributors of fatty acids, while terrestrial fatty acids play a secondary role. The results of principal component analysis of fatty acids showed that the total information of fatty acids in sediments of the East China Sea could be reflected by marine microalgae-bacteria (PC1) and terrestrial sources (PC2). The contribution rate of PC1 was 75.4% and the contribution rate of PC2 was 11.9%. The alkyl alcohols in surface sediments are mainly derived from terrestrial higher plants, and each section shows that the farther offshore the less alkyl alcohols are imported from terrestrial sources. The ratio of cyanosterol to dinosterol shows that Pyrophyta is the dominant species in the study area. The farther offshore, the higher the ratio of phytosterol, which may be related to the upwelling and the warm current in Taiwan.
【作者单位】：中国地质调查局青岛海洋地质研究所;中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室;
【基金】：国家自然科学基金项目(41406078) 中国地质调查局地质调查项目(GZH201200506)
【分类号】：P736.4

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