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    南海不同水深表层沉积物脂肪酸分布特征及其生物源的空间变化

    杨义 郝宇昕 阮小燕 李学杰 姚永坚 杨楚鹏

    杨义, 郝宇昕, 阮小燕, 李学杰, 姚永坚, 杨楚鹏, 2018. 南海不同水深表层沉积物脂肪酸分布特征及其生物源的空间变化. 地球科学, 43(11): 4027-4035. doi: 10.3799/dqkx.2018.284
    引用本文: 杨义, 郝宇昕, 阮小燕, 李学杰, 姚永坚, 杨楚鹏, 2018. 南海不同水深表层沉积物脂肪酸分布特征及其生物源的空间变化. 地球科学, 43(11): 4027-4035. doi: 10.3799/dqkx.2018.284
    Yang Yi, Hao Yuxin, Ruan Xiaoyan, Li Xuejie, Yao Yongjian, Yang Chupeng, 2018. Spatial Distribution of Fatty Acids and Inferred Organisms in Surface Sediments of Different Water Depths in the South China Sea. Earth Science, 43(11): 4027-4035. doi: 10.3799/dqkx.2018.284
    Citation: Yang Yi, Hao Yuxin, Ruan Xiaoyan, Li Xuejie, Yao Yongjian, Yang Chupeng, 2018. Spatial Distribution of Fatty Acids and Inferred Organisms in Surface Sediments of Different Water Depths in the South China Sea. Earth Science, 43(11): 4027-4035. doi: 10.3799/dqkx.2018.284

    南海不同水深表层沉积物脂肪酸分布特征及其生物源的空间变化

    doi: 10.3799/dqkx.2018.284
    基金项目: 

    自然资源部广州海洋地质调查局项目 GZH201500202

    国家重点研发计划项目 2016YFA0601100

    详细信息
      作者简介:

      杨义(1991-), 男, 博士研究生, 主要从事海洋有机地球化学研究

      通讯作者:

      阮小燕

    • 中图分类号: P67

    Spatial Distribution of Fatty Acids and Inferred Organisms in Surface Sediments of Different Water Depths in the South China Sea

    • 摘要: 为探究边缘海区域由陆架到深海盆脂类的分布模式及其指示的生物源的空间变化特征,对采集于南海4个不同水深断面的表层沉积物脂肪酸进行了系统研究.从表层沉积物中检出丰富的脂肪酸,包括直链饱和脂肪酸、直链不饱和脂肪酸和支链脂肪酸等.其中,高碳数直链脂肪酸(≥C20)主要来源于陆源高等植物的输入,低碳数直链脂肪酸主要来源于藻类的贡献,低碳数支链(包括异构和反异构)脂肪酸主要来源于细菌贡献.高碳数脂肪酸指示的高等植物输入,在南海沿岸区的高值与河流的输入有关,而在深海盆的高值可能与洋流、风尘输入等有关.低碳数支链脂肪酸指示的细菌分布在南海北部沿岸表现出高值,在深海盆表现出较低的分布模式.低碳数直链脂肪酸表征的浮游植物的贡献在南海北部表现出高值,在深海盆局部区域也表现出高值分布.细菌和浮游植物在南海北部表现出的高值,可能与丰富的营养盐条件有关.而浮游植物在深海盆的分布模式,可能受到洋流以及其他输入的影响.

       

    • 图  1  南海不同水深表层沉积物断面站位分布

      站位资料来源于广州海洋地质调查局内部资料

      Fig.  1.  Distribution of surface sediment samples collected from different water depths in the South China Sea

      图  2  海洋沉积物样品m/z=74质量色谱图

      Fig.  2.  The m/z=74 mass chromatograph of fatty acids in marine sediments

      图  3  不同水深表层沉积物脂肪酸指标的分布特征

      a.平均碳链长度ACL随水深的分布;b.低碳数/高碳数脂肪酸随水深的分布

      Fig.  3.  The profile of FAs indices in the surface sediments from different water depths

      图  4  指示陆源高等植物输入的高碳数脂肪酸相对含量在南海表层沉积物的空间分布模式

      图中nC20+代表高碳数(n≥20)脂肪酸浓度,单位为μg/g·TOC

      Fig.  4.  Spatial distribution of long-chain FAs abundance normalized to TOC content indicative of the terrestrial higher plant contribution to the surface sediments of the SCS

      图  5  来自浮游植物的生物标志化合物相对含量在南海表层沉积物的分布模式

      a.低碳数脂肪酸的总含量分布;b.C14脂肪酸的含量分布;c.C20脂肪酸的含量分布.单位为μg/g·TOC

      Fig.  5.  Spatial distribution of phytoplankton biomarkers relative to TOC content in the surface sediments of the SCS

      图  6  细菌来源的异构脂肪酸iC15化合物(a)和反异构脂肪酸aC15(b)在南海表层沉积物的分布

      图中iC15和aC15分别代表异构和反异构C15脂肪酸,单位为μg/g·TOC

      Fig.  6.  Spatial distribution of bacterial abundance based on the iC15 (a) and the aC15 (b) FAs abundance normalized to TOC content in the surface sediments of the SCS

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