Article

Water, Air and Soil Pollution: Focus

, Volume 1, Issue 5, pp 447-454

First online:

Methane Fluxes from a Wetland using the Flux-Gradient Technique The Measurement of Methane Flux from a Natural Wetland Pond and Adjacent Vegetated Wetlands using a TDL-Based Flux-Gradient Technique

  • G. C. EdwardsAffiliated withSchool of Engineering, University of Guelph
  • , G. M. DiasAffiliated withSchool of Engineering, University of Guelph
  • , G. W. ThurtellAffiliated withDepartment of Land Resource Science, University of Guelph, Guelph, ON
  • , G. E. KiddAffiliated withDepartment of Land Resource Science, University of Guelph, Guelph, ON
  • , N. T. RouletAffiliated withDepartment of Geography, McGill University
  • , C. A. KellyAffiliated withDepartment of Microbiology, University of Manitoba
  • , J. W. M. RuddAffiliated withDepartment of Fisheries and Oceans, Freshwater Institute
  • , A. MooreAffiliated withDepartment of Land Resource Science, University of Guelph, Guelph, ON
  • , L. Halfpenny-MitchellAffiliated withSchool of Engineering, University of Guelph

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Abstract

Methane emissions were measured from a bog andlake in the Experimental Lakes Area in Northern Ontario in 1992and 1993, prior to and following flooding. Bog fluxes were smallin 1992 (0.27 mg m-2 d-1) but increased 5-fold in 1993 afterflooding. Over the bog, there was a diel cycle of nighttimeemission and daytime uptake in 1992 in contrast to constantemission in 1993. Lake emissions decreased after flooding butwere much greater than bog emissions in both years (average = 7.3 mg m-2 d-1). Seasonally, the bog flux was correlated withground temperatures after flooding. In 1992, lake fluxes werecorrelated with air temperature on a daily basis. In contrast,seasonal lake fluxes were correlated with water and sedimenttemperatures in 1992, but only with sediment temperatures in1993. These results are explained with respect to the effects offlooding on lake and bog dynamics.

methane emissions micrometeorological measurements seasonal cycles wetland flooding