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Stable Carbon Isotope Fractionation During Methanogenesis in Three Boreal Peatland Ecosystems : Volume 7, Issue 11 (29/11/2010)

By Galand, P. E.

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Book Id: WPLBN0004004122
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Stable Carbon Isotope Fractionation During Methanogenesis in Three Boreal Peatland Ecosystems : Volume 7, Issue 11 (29/11/2010)  
Author: Galand, P. E.
Volume: Vol. 7, Issue 11
Language: English
Subject: Science, Biogeosciences
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Yrjälä, K., Conrad, R., & Galand, P. E. (2010). Stable Carbon Isotope Fractionation During Methanogenesis in Three Boreal Peatland Ecosystems : Volume 7, Issue 11 (29/11/2010). Retrieved from http://worldebooklibrary.com/


Description
Description: UPMC Univ Paris 06, Observatoire Océanologique, 66651 Banyuls-sur-Mer, France. The degradation of organic matter to CH4 and CO2 was investigated in three different boreal peatland systems in Finland, a mesotrophic fen (MES), an oligotrophic fen (OLI), and an ombrotrophic peat (OMB). MES had similar production rates of CO2 and CH4, but the two nutrient-poor peatlands (OLI and OMB) produced in general more CO2 than CH4. Δ13C analysis of CH4 and CO2 in the presence and absence methyl fluoride (CH3F), an inhibitor of acetoclastic methanogenesis, showed that CH4 was predominantly produced by hydrogenotrophic methanogenesis and that acetoclastic methanogenesis only played an important role in MES. These results, together with our observations concerning the collective inhibition of CH4 and CO2 production rates by CH3F, indicate that organic matter was degraded through different paths in the mesotrophic and the nutrient-poor peatlands. In the mesotrophic fen, the major process is canonical fermentation followed by acetoclastic and hydrogenotrophic methanogenesis, while in the nutrient-poor peat, organic matter was apparently degraded to a large extent by a different path which finally involved hydrogenotrophic methanogenesis. Our data suggest that degradation of organic substances in the oligotrophic environments was incomplete and involved the use of organic compounds as oxidants.

Summary
Stable carbon isotope fractionation during methanogenesis in three boreal peatland ecosystems

Excerpt
Avery, G. B., Shannon, R. D., White, J. R., Martens, C. S., and Alperin, M. J.: Effect of seasonal changes in the pathways of methanogenesis on the δ13C values of pore water methane in a Michigan peatland, Global Biogeochem. Cy., 13, 475–484, 1999.; Bartlett, K. B. and Harriss, R. C.: Review and assessment of methane emissions from wetlands, Chemosphere, 26, 261–320, 1993.; Chanton, J. P., Glaser, P. H., Chasar, L. S., Burdige, D. J., Hines, M. E., Siegel, D. I., Tremblay, L. B., and Cooper, W. T.: Radiocarbon evidence for theimportance of surface vegetation on fermentation and methanogenesis in contrasting types of boreal peatlands, Global Biogeochem. Cy., 22, GB4022, doi:10.1029/2008GB003274, 2008.; Chasar, L. S., Chanton, J. P., Glaser, P. H., Siegel, D. I., and Rivers, J. S.: Radiocarbon and stable carbon isotopic evidence for transport and transformation of dissolved organic carbon, dissolved inorganic carbon, and CH4 in a northern Minnesota peatland, Global Biogeochem. Cy., 14, 1095–1108, 2000.; Chin, K. J. and Conrad, R.: Intermediary metabolism in methanogenic paddy soil and the influence of temperature, FEMS Microbiol. Ecol., 18, 85–102, 1995.; Conrad, R.: Contribution of hydrogen to methane production and control of hydrogen concentrations in methanogenic soils and sediments [review], FEMS Microbiol. Ecol., 28, 193–202, 1999.; Conrad, R.: Quantification of methanogenic pathways using stable carbon isotopic signatures: a review and a proposal, Org. Geochem., 36, 739–752, 2005.; Conrad, R., Chan, O. C., Claus, P., and Casper, P.: Characterization of methanogenic Archaea and stable isotope fractionation during methane production in the profundal sediment of an oligotrophic lake (Lake Stechlin, Germany), Limnol. Oceanogr., 52, 1393–1406, 2007.; Hayes, J. M.: Factors controlling 13C contents of sedimentary organic compounds: principles and evidence, Mar. Geol., 113, 111–125, 1993.; Conrad, R., Claus, P., and Casper, P.: Characterization of stable isotope fractionation during methane production in the sediment of a eutrophic lake, Lake Dagow, Germany, Limnol. Oceanogr., 54, 457–471, 2009a.; Conrad, R., Claus, P., and Casper, P.: Stable isotope fractionation during the methanogenic degradation of organic matter in the sediment of an acidic bog lake, Lake Grosse Fuchskuhle, Limnol.Oceanogr., 54, 1932–1942, 2010a.; Conrad, R. and Klose, M.: How specific is the inhibition by methyl fluoride of acetoclastic methanogenesis in anoxic rice field soil? FEMS Microbiol. Ecol., 30, 47–56, 1999.; Conrad, R., Klose, M., Claus, P., and Dan, J.: Activity and composition of the methanogenic archaeal community in soil vegetated with wild rice versus cultivated rice, Soil Biol. Biochem., 41, 1390–1395, 2009b.; Conrad, R., Klose, M., Claus, P., and Enrich-Prast, A.: Methanogenic pathway, 13C isotope fractionation, and archaeal community composition in the sediment of two clearwater lakes of Amazonia, Limnol. Oceanogr., 55, 689–702, 2010b.; Duddleston, K. N., Kinney, M. A., Kiene, R. P., and Hines, M. E.: Anaerobic microbial biogeochemistry in a northern bog: Acetate as a dominant metabolic end product, Global Biogeochem. Cy., 16, 1063, doi:10.1029/2001GB001402, 2002.; Galand, P. E., Fritze, H., Conrad, R., and Yrjälä, K.: Pathways for methanogenesis and diversity of methanogenic archaea in three boreal peatland ecosystems, Appl. Environ. Microbiol., 71, 2195–2198, 2005.; Galand, P. E., Saarnio, S., Fritze, H., and Yrjälä, K.: Depth related diversity of methanogen Archaea in Finnish oligotrophic fen, FEMS Microbiol. Ecol. 42, 441–449, 2002.; Goevert, D. and Conrad, R.: Effect of substrate concentration on carbon isotope fractionation during acetoclastic methanogenesis by Methanosarcina barkeri and M. acetivorans and in rice field soil, Appl. Environ. Microbiol., 75, 2605–2612

 

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