M. E. Repo et al., Release of CO2 and CH4 from small wetland lakes in western Siberia

Tellus B, Vol. 59, No. 5, pp. 788–796 (2007). DOI 10.1111/j.1600-0889.2007.00301.x

Release of CO₂ and CH₄ from small wetland lakes in western Siberia

M. E. REPO^1,*, J. T. HUTTUNEN¹, A. V. NAUMOV², A. V. CHICHULIN², E. D. LAPSHINA³, W. BLEUTEN⁴ and P. J. MARTIKAINEN¹

¹University of Kuopio, Department of Environmental Science, Bioteknia 2, P.O. Box 1627, FI-70211 Kuopio, Finland; ²Institute of Soil Science and Agrochemistry, Russian Academy of Science, Siberian Branch, Sovietskaya 18, 630099 Novosibirsk, Russia; ³Yugra State University, ul. Chekhova 16, 628012, Khanty-Mansiysk, Russia; ⁴Utrecht University, Department of Physical Geography, P.O. Box 80115, 3508 TC Utrecht, The Netherlands

(Manuscript received 3 November 2006; in final form 25 June 2007)

Abstract

CO₂ and CH₄ fluxes were measured from three small wetland lakes located in the middle taiga and forest tundra zones on West Siberian Lowlands (WSL), the world's largest wetland area. Fluxes were measured during summer 2005 using floating chambers and were validated against the thin boundary layer model based on the relationship between gas exchange and wind speed. All studied lakes were supersaturated with CO₂ and CH₄, and acted on a seasonal basis as sources of these greenhouse gases to the atmosphere. Daily mean CO₂ fluxes measured with chambers ranged from near the zero to 3.1 g CO₂ m⁻² d⁻¹ and corresponding CH₄ fluxes from 1.1 to 120 mg CH₄ m⁻² d⁻¹. CH₄ ebullition (0.65–11 mg CH₄ m⁻² d⁻¹) was detected in two of the lakes. Total carbon evasion from the studied lakes during the active season was 23–66 g C m⁻², of which more than 90% was released as CO₂-C. The carbon loss per unit area from the studied lakes was of similar magnitude as previously reported values of net carbon uptake of Siberian peatlands. This emphasizes the importance of small water-bodies in the carbon balance of West Siberian landscape.

*Corresponding author. e-mail: Maija.Repo@uku.fi

Copyright 2007 The Author Journal compilation © 2007 Blackwell Munksgaard

Link to abstract: http://www3.interscience.wiley.com/journal/118533134/abstract