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Activité potentielle de méthanogenèse dans les sols, tourbières, sédiments lacustres et du réservoir hydroélectrique Robert-Bourassa dans le moyen Nord-Canadien

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Abstract:

Flooding of land associated with the creation of reservoirs may increase, at least in the short term, methane flux to the atmosphere. To evaluate the potential contribution of such land use on methane production, field samples were studied in vitro for the potential activity of methanogenic bacteria in unflooded or flooded boreal forest soils, together with lacustrine sediments. From this comparative study, periodically flooded or flooded peats contribute more to methane production than do unflooded peats, soils, and natural lake sediment. The intensity and temporal changes in the activity of methanogenic archaea in the different systems depended on a combination of environmental factors, such as the amount and quality of organic carbon, the water level, and the concentration of oxidizing ions (SO42-, Fe3+).Key words: methane production, reservoir, sediment, soils, peats.

L'immersion des sols lors de la création d'un réservoir hydroélectrique pourrait augmenter, au moins à court terme, le flux de méthane vers l'atmosphère. Afin d'évaluer la contribution potentielle de tels aménagements à la production de méthane, nous avons étudié l'activité potentielle des bactéries méthanogènes dans les sols de la forêt boréale non immergés et immergés lors de la mise en eau d'un réservoir, ainsi que des sédiments lacustres. De cette étude comparative, il ressort que les tourbières inondées périodiquement (zone de marnage) ou en permanence, peuvent contribuer d'avantage à la production de méthane que les tourbières non inondées, les sols ou les sédiments de lacs naturels. Toutefois, l'intensité et l'évolution temporelle de l'activité potentielle des bactéries méthanogènes dans les différents milieux pris en compte ont été sous la dépendance d'une combinaison de plusieurs facteurs environnementaux, notamment, la quantité de la matière organique, le niveau d'eau et la présence de certains ions oxydants (SO42-, Fe3+).Mots clés : méthanogenèse, réservoir, sédiments, sols, tourbières.

Document Type: Research Article

Publication date: January 1, 2005

More about this publication?
  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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