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Wagner, D.E.* ; Gattinger, A. ; Embacher, A. ; Pfeiffer, E.-M.* ; Schloter, M. ; Lipski, A.*

Methanogenic activity and biomass in Holocene permafrost deposits of the Lena Delta, Siberian Arctic and its implication for the global methane budget.

Glob. Change Biol. 13, 1089-1099 (2007)

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Open Access Green as soon as Postprint is submitted to ZB.

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Permafrost environments within the Siberian Arctic are natural sources of the climate relevant trace gas methane. In order to improve our understanding of the present and future carbon dynamics in high latitudes, we studied the methane concentration, the quantity and quality of organic matter, and the activity and biomass of the methanogenic community in permafrost deposits. For these investigations a permafrost core of Holocene age was drilled in the Lena Delta (72°22'N, 126°28'E). The organic carbon of the permafrost sediments varied between 0.6% and 4.9% and was characterized by an increasing humification index with permafrost depth. A high CH4 concentration was found in the upper 4 m of the deposits, which correlates well with the methanogenic activity and archaeal biomass (expressed as PLEL concentration). Even the incubation of core material at -3 and -6°C with and without substrates showed a significant CH4 production (range: 0.04–0.78 nmol CH4 h-1 g-1). The results indicated that the methane in Holocene permafrost deposits of the Lena Delta originated from modern methanogenesis by cold-adapted methanogenic archaea. Microbial generated methane in permafrost sediments is so far an underestimated factor for the future climate development.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords methane; methane release; ethanogenesis; permafrost deposits

ISSN (print) / ISBN 1354-1013

e-ISSN 1365-2486

Journal Global Change Biology

Quellenangaben Volume: 13, Issue: 5, Pages: 1089-1099

Publisher Wiley

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Soil Ecology (IBOE)