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首页> 外文期刊>Aquatic Sciences >Oxidation and emission of methane in a monomictic lake (Rotsee, Switzerland)
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Oxidation and emission of methane in a monomictic lake (Rotsee, Switzerland)

机译：甲烷在单分子湖泊中的氧化和排放（瑞士罗特湖）

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摘要

The build-up of methane in the hypolimnion of the eutrophic Lake Rotsee (Lucerne, Switzerland) was monitored over a full year. Sources and sinks of methane in the water column were characterized by measuring concentrations and carbon isotopic composition. In fall, high methane concentrations (up to 1 mM) were measured in the anoxic water layer. In the oxic layer, methane concentrations were much lower and the isotopic composition shifted towards heavy carbon isotopes. Methane oxidation rates peaked at the interface between oxic and anoxic water layers at around 8-10 m depth. The electron balance between the oxidants oxygen, sulphate, and nitrate, and the reductants methane, sulphide and ammonium, matched very well in the chemocline during the stratified season. The profile of carbon isotopic composition of methane showed strong indications for methane oxidation at thernchemocline (including the oxycline). Aerobic methane oxidizing bacteria were detected at the interface using fluorescence in situ hybridization. Sequencing the responsible organisms from DGGE bands revealed that aerobic methanotrophs type I closely related to Methylomonas were present. Sulphate consumption occurred at the sediment surface and, only towards the end of the stagnation period, matched with a zone of methane consumption. In any case, the flux of sulphate below the chemocline was not sufficient to oxidize all the methane and other oxidants like nitrate, iron or manganese are necessary for the observed methane oxidation. Although most of the methane was oxidized either aerobically or anaerobically, Lake Rotsee was still a source of methane to the atmosphere with emission rates between 0.2 mg CH_4 m~(-2) day~(-1) in February and 7 mg CH_4 m~(-2) day~(-1) in November.
机译：全年对富营养化的Rotsee湖（瑞士卢塞恩）的次生甲烷中的甲烷积累进行监测。通过测量浓度和碳同位素组成来表征水柱中甲烷的源和汇。秋季，在缺氧水层中测得高甲烷浓度（最高1 mM）。在有氧层中，甲烷浓度要低得多，同位素组成向重碳同位素转移。甲烷氧化速率在约8-10 m的深度处的有氧和无氧水层之间的界面处达到峰值。分层期间，氧化剂中的氧，硫酸盐和硝酸盐与还原剂甲烷，硫化物和铵之间的电子平衡非常匹配。甲烷的碳同位素组成图谱显示了在化疗支气管（包括奥克西林）上甲烷氧化的强烈迹象。使用荧光原位杂交在界面处检测到好氧甲烷氧化细菌。从DGGE谱带中对负责生物进行测序表明，存在与甲基单胞菌密切相关的I型好氧甲烷营养生物。硫酸盐消耗发生在沉积物表面，并且仅在停滞期结束时才与甲烷消耗区域匹配。在任何情况下，低于chemocline的硫酸盐通量不足以氧化所有甲烷，而其他氧化剂如硝酸盐，铁或锰对于观察到的甲烷氧化是必需的。尽管大部分甲烷被需氧或厌氧氧化，但Rotsee湖仍然是大气中的甲烷源，其排放量在2月的0.2 mg CH_4 m〜（-2）day〜（-1）和7 mg CH_4 m〜 （-2）天〜11月（-1）。

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  • 来源
    《Aquatic Sciences》 |2010年第4期|p.455-466|共12页
  • 作者

    C. J. Schubert; F. S. Lucas; E. Durisch-Kaiser; R. Stierli; T. Diem; O. Scheidegger; F. Vazquez; B. Mueller;

  • 作者单位

    Department of Surface Waters-Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

    rnFaculte des Sciences et Technologie, Cereve UMR MA 102, Universite Paris 12, 61 ave du General de Gaulle, 94010 Creteil Cedex, France Department of Surface Waters-Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

    rnInstitute of Biogeochemistry and Pollutant Dynamics, Swiss Federal Institute of Technology (ETH), Universitatsstrasse 16, 8092 Zurich, Switzerland Department of Surface Waters-Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

    rnDepartment of Surface Waters-Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

    rnDepartment of Surface Waters-Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

    rnDepartment of Surface Waters-Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

    rnDepartment of Surface Waters-Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

    rnDepartment of Surface Waters-Research and Management, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

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

    methane oxidation; methane emission; methane oxidizing bacteria; lakes; redox and flux calculation;

    机译：甲烷氧化甲烷排放;甲烷氧化细菌;湖泊氧化还原和通量计算;

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