Interactive comment on “Anaerobic oxidation of methane in grassland soils used for cattle
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چکیده
The paper “Anaerobic oxidation of methane in grassland soils used for cattle husbandry” reports interesting laboratory data showing methane oxidation in an agricultural soil under anaerobic conditions. Moreover, by using 13CH4 the authors are able to trace the carbon into PLFA and make some interpretation on methanotrophic sources. In concert with geochemical data and calculations, it appears plausible that methane oxidation was nitrate-dependent, which – to the best of my knowledge – is the first good evidence for the occurrence of this process in soils. Studying methanotrophic processes, in general, is a hot topic and suitable for Biogeosciences. The paper is generally well written, includes interesting data and – except for some points mentioned below – conclusions are supported by the data. Before publication in Biogeosciences,
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Interactive comment on “Anaerobic oxidation of methane in grassland soils used for cattle
The paper “Anaerobic oxidation of methane in grassland soils used for cattle husbandry” reports interesting laboratory data showing methane oxidation in an agricultural soil under anaerobic conditions. Moreover, by using 13CH4 the authors are able to trace the carbon into PLFA and make some interpretation on methanotrophic sources. In concert with geochemical data and calculations, it appears p...
متن کاملInteractive comment on “Anaerobic oxidation of methane in grassland soils used for cattle husbandry” by A. Bannert et al
My main concern relates to the chemotaxonomic interpretation of PLFA, particularly of 16:1!7. 16:1!7 (syn. 16:1_9) is in fact a ubiquitous FA in microbial systems and can not serve as biomarker strictu sensu. Anyway, despite the fact that some of the conclusions made by Raghoebarsing et al. (2006) were wrong (meaning the co-existence between archaea and bacteria), the result, which they gained ...
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Anaerobic digestion (AD) of biowastes is one of the most common ways to produce methane-rich biogas, which has considerable potential to replace the fossil fuel used in multiple applications, such as vehicular transportation, internal combustion engines, cogeneration of heat and power systems and many other systems. Many companies are involved in the design and construction of anaerobic digesti...
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[1] Anaerobic oxidation of methane (AOM) is a considerable sink for the greenhouse gas methane (CH4) in marine systems, but the importance of this process in terrestrial systems is less clear. Lowland boreal soils and wet tropical soils are two hot spots for CH4 cycling, yet AOM has been essentially uncharacterized in these systems. We investigated AOM in soils from sites in Alaska and Puerto R...
متن کاملComment on "Selective anaerobic oxidation of methane enables direct synthesis of methanol".
The comment and response concerning the report of oxidation of methane to methanol by water (Reports, 5 May 2017, p. 523) do not fully capture the implications of thermodynamic limitations. A nonisothermal process in which each cycle requires a large temperature swing and permits only substoichiometric methane conversion surely could not be carried out on any practical scale.
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