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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sulfur and oxygen isotope tracing of sulfate driven anaerobic methane oxidation in estuarine sediments
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Sulfur and oxygen isotope tracing of sulfate driven anaerobic methane oxidation in estuarine sediments

机译：河口沉积物中硫酸盐驱动的厌氧甲烷氧化的硫和氧同位素示踪

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摘要

We use multiple stable isotope measurements in two highly stratified estuaries located along the Mediterranean coast of Israel (the Yarqon and the Oishon) to explore the consumption of sulfate through the anaerobic oxidation of methane (sulfate-driven AOM). At both sites, pore fluid sulfate is rapidly consumed within the upper 15-20 cm. Although the pore fluid sulfate and dissolved inorganic carbon (DIC) concentration profiles change over a similar range with respect to depth, the sulfur and oxygen isotopes in the pore fluid sulfate and the carbon isotopes in the pore fluid DIC are fundamentally different. This pore fluid isotope geochemistry indicates that the microbial mechanism of sulfate reduction differs between the studied sites. We suggest that in the Yarqon estuary, sulfate is consumed entirely through AOM, whereas in the Qishon, both AOM and bacterial sulfate reduction through organic matter oxidation coexist. These results have implications for understanding the microbial mechanisms behind sulfate-driven AOM. Our data compilation from marine and marginal marine environments supports the conclusion that the intracellular pathways of sulfate reduction varies among environments with sulfate-driven AOM. The data can be used to elucidate new pathways in the cycling of methane and sulfate, and the findings are applicable to the broader marine environment.
机译：我们在位于以色列地中海沿岸的两个高度分层的河口（亚尔孔和奥西翁）中使用多个稳定的同位素测量值，通过甲烷的厌氧氧化探索硫酸盐的消耗（硫酸盐驱动的AOM）。在这两个位置，孔隙液中的硫酸盐在15-20厘米的上部迅速被消耗掉。尽管孔隙流体的硫酸盐和溶解的无机碳（DIC）浓度分布随深度变化在相似的范围内，但孔隙流体的硫酸盐中的硫和氧同位素与孔隙流体的DIC中的碳同位素根本不同。这种孔隙流体同位素地球化学表明，硫酸盐还原的微生物机理在所研究的位置之间是不同的。我们认为，在亚尔孔河口，硫酸盐完全通过AOM消耗，而在Qishon，通过有机物氧化的AOM和细菌硫酸盐还原同时存在。这些结果对理解硫酸盐驱动的AOM背后的微生物机制具有启示意义。我们从海洋和边缘海洋环境收集的数据支持以下结论：在硫酸盐驱动的AOM环境中，硫酸盐还原的细胞内途径有所不同。该数据可用于阐明甲烷和硫酸盐循环中的新途径，该发现适用于更广泛的海洋环境。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2014年第1期|4-11|共8页
  • 作者

    Gilad Antler; Alexandra V. Turchyn; Barak Herut; Alicia Davies; Victoria C.F. Rennie; Orit Sivan;

  • 作者单位

    Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK;

    Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK;

    Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel;

    Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK;

    Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK;

    Department of Geological and Environmental Sciences, Ben Gurion University, Beer Sheva 84105, Israel;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    sulfate; methane; estuaries; isotopes; AOM;

    机译：硫酸盐甲烷河口同位素AOM;

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