Oecologia

, Volume 110, Issue 3, pp 414–422

Seasonal variation in CH4 emissions and production and oxidation potentials at microsites on an oligotrophic pine fen

  • S. Saarnio
  • Jukka Alm
  • Jouko Silvola
  • Annalea Lohila
  • Hannu Nykänen
  • Pertti J. Martikainen

DOI: 10.1007/s004420050176

Cite this article as:
Saarnio, S., Alm, J., Silvola, J. et al. Oecologia (1997) 110: 414. doi:10.1007/s004420050176

Abstract

 Temporal and spatial variation in CH4 emissions was studied at hummock, Eriophorum lawn, flark and Carex lawn microsites in an oligotrophic pine fen over the growing season using a static chamber method, and CH4 production and oxidation potentials in peat profiles from hummock and flark were determined in laboratory incubation experiments. Emissions were lowest in the hummocks, and decreased with increasing hummock height, while in the lawns and flarks they increased with increasing sedge cover. Statistical response functions with water table and peat temperature as independent variables were calculated in order to reconstruct seasonal CH4 emissions by reference to the time series for peat temperature and water table specific to each microsite type. Mean CH4 emissions in the whole area in the snow-free period of 1993, weighted in terms of the proportions of the microsites, were 1.7 mol CH4 m–2. Potential CH4 production and oxidation rates were very low in the hummocks rising above the groundwater table, but were relatively similar when expressed per dry weight of peat both in the hummocks and flarks below the water table. The CH4 production potential increased in autumn at both microsites and CH4 oxidation potential seemed to decrease. The decrease in temperature in autumn certainly reduced in situ decomposition processes, possibly leaving unused substrates in the peat, which would explain the increase in CH4 production potential.

Key words Methane Microsites Production Oxidation Oligotrophic fen 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • S. Saarnio
    • 1
  • Jukka Alm
    • 1
  • Jouko Silvola
    • 1
  • Annalea Lohila
    • 2
  • Hannu Nykänen
    • 2
  • Pertti J. Martikainen
    • 2
  1. 1.Department of Biology, University of Joensuu, P.O.Box 111, FIN-80101 Joensuu, Finland fax: +358 13 2513590; e-mail: saarnio@joyl.joensuu.fiFI
  2. 2.Laboratory of Environmental Microbiology, National Public Health Institute, P.O.Box 95, FIN-70701 Kuopio, FinlandFI

Personalised recommendations