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首页> 外文期刊>Water Research >Unveiling the transformation and bioavailability of dissolved organic matter in contrasting hydrothermal vents using fluorescence EEM-PARAFAC
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Unveiling the transformation and bioavailability of dissolved organic matter in contrasting hydrothermal vents using fluorescence EEM-PARAFAC

机译：使用荧光EEM-PARAFAC揭示对比热液喷口中溶解的有机物的转化和生物利用度

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摘要

The submarine hydrothermal systems are extreme environments where active cycling of dissolved organic matter (DOM) may occur. However, little is known about the optical properties and bioavailability of hydrothermal DOM, which could provide valuable insights into its transformation processes and biogeochemical reactivity. The quantity, quality, and bioavailability of DOM were investigated for four very different hydrothermal vents east of Taiwan, using dissolved organic carbon (DOC), absorption spectroscopy, and fluorescence excitation-emission matrices-parallel factor analysis (EEM-PARAFAC). The DOC and absorption coefficient C1280 were both lower in the two hydrothermal vents off the Orchid Island and on the Green Island than in the surrounding seawater and the two vents off the Kueishantao Island, indicating effective removals of DOM in the former two hydrothermal systems owing to possible adsorption/co-precipitation and thermal degradation respectively. The four hydrothermal DOM showed notable differences in the absorption spectral slope S275-295, humification index HIX, biological index BIX, EEM spectra, and the relative distributions of seven PARAFAC components. The results demonstrated a high diversity of chemical composition and transformation history of DOM under contrasting hydro thermal conditions. The little change in the hydrothermal DOC after 28-day microbial incubations indicated a low bioavailability of the bulk DOM, and different PARAFAC components showed contrasting bioavailability. The results have profound implications for understanding the biogeochemical cycling and environmental effects of hydrothermal DOM in the marine environments. (C) 2017 Elsevier Ltd. All rights reserved.
机译：水下热液系统是极端的环境，可能会发生溶解有机物（DOM）的主动循环。但是，对水热DOM的光学性质和生物利用度知之甚少，这可以为其转化过程和生物地球化学反应性提供有价值的见解。利用溶解有机碳（DOC），吸收光谱和荧光激发-发射矩阵-平行因子分析（EEM-PARAFAC），对台湾东部四个完全不同的热液喷口研究了DOM的数量，质量和生物利用度。兰花岛和绿岛附近的两个热液喷口的DOC和吸收系数C1280均低于周围海水和奎山桃岛附近的两个喷口，表明前两个热液系统有效去除了DOM，原因是可能分别发生吸附/共沉淀和热降解。四个热液DOM在吸收光谱斜率S275-295，增湿指数HIX，生物学指数BIX，EEM光谱以及七个PARAFAC组分的相对分布方面表现出显着差异。结果表明，在相反的水热条件下，DOM的化学组成和转变历史具有高度的多样性。在经过28天的微生物培养后，热液DOC的变化很小，表明大量DOM的生物利用度较低，并且不同的PARAFAC组分显示出相反的生物利用度。该结果对理解海洋环境中热液DOM的生物地球化学循环和环境影响具有深远意义。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Water Research》 |2017年第15期|195-203|共9页
  • 作者

    Yang Liyang; Zhuang Wan-E; Chen Tung Arthur Chen; Wang Bing-Jye; Kuo Fu-Wen;

  • 作者单位

    Fuzhou Univ, Coll Environm & Resources, Fuzhou, Fujian, Peoples R China|Natl Sun Yat Sen Univ, Dept Oceanog, Kaohsiung 804, Taiwan;

    Fujian Agr & Forestry Univ, Coll Life Sci, Fuzhou, Fujian, Peoples R China;

    Natl Sun Yat Sen Univ, Dept Oceanog, Kaohsiung 804, Taiwan|Second Inst Oceanol, State Ocean Adm, Hangzhou, Peoples R China;

    Natl Sun Yat Sen Univ, Dept Oceanog, Kaohsiung 804, Taiwan;

    Natl Museum Marine Biol Aquarium, Pingtung, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrothermal vent; Dissolved organic matter; Bioavailability; Absorption spectroscopy; EEM-PARAFAC;

    机译：热液喷口;溶解性有机物;生物利用度;吸收光谱;EEM-PARAFAC;

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