Suo - Mires and peat vol. 53 no. 3-4 | 2002
Typpioksiduulivirrat suunnitellun Vuotoksen tekojärven alueen soilta.
English title: Fluxes of nitrous oxide on natural peatlands in Vuotos, an area projected for a hydroelectric reservoir in northern Finland.
Avainsanat:
global change;
Northern boreal peatlands;
climate warming;
flooding;
greenhouse gas emission;
hydro dam
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Nitrous oxide (N2O) fluxes were measured on ten natural minerotrophic peatlands in an area planned for a hydroelectric reservoir (Vuotos) in northern Finland. The mean N2O fluxes from the sites with mean water tables from –25 to 3.4 cm (negative below the peat surface) ranged from –30 to 230 µg m–2 d–1 during summer 1994. At the driest site, the herb-grass spruce mire with the mean water table at –38 cm, the mean summertime N2O emission was 940 µg m-2 d-1 in 1994, attributable to the increased N2O release at low peat temperatures in autumn. A similar increase in the N2O emissions was not found in 1995, as the measurements were finished before the peat started to freeze. The mean N2O fluxes at the sites correlated negatively with the mean water table levels. The peatlands in the northern boreal zone are unlikely important sources of atmospheric N2O in their natural state. The planned reservoir would barely have large long-term N2O emissions from the pelagic zone, but the importance of temporally flooded areas in the postflood N2O release is uncertain similar to the short-term emissions following the flooding.
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Huttunen,
Research and Development Unit of Environmental Health, Department of Environmental Sciences, Bioteknia 2, University of Kuopio, PO Box 1627, FIN-70211 Kuopio, Finland
Sähköposti:
ei.tietoa@nn.oo
- Nykänen, Sähköposti: ei.tietoa@nn.oo
- Turunen, Sähköposti: ei.tietoa@nn.oo
- Nenonen, Sähköposti: ei.tietoa@nn.oo
- Martikainen, Sähköposti: ei.tietoa@nn.oo
Nursing plants in peatland restoration: on their potential use to alleviate frost heaving problems.
Avainsanat:
Sphagnum;
revegetation;
regeneration;
rehabilitation;
colonisation;
degraded mire;
peat erosion
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Peatland restoration measures usually require the rewetting of the disturbed ecosystem. In northern latitudes, the increase in wetness of the bare peat substrate causes frost heaving. In this paper, we described the problem of frost heaving in cutover peatlands and an array of means whereby it can be diminished. Several avenues of research should be pursued with the use of nursing plants to reduce frost heaving and promote Sphagnum establishment and growth. For large scale restoration of peatland ecosystems, Polytrichum strictum appears to be a good potential nursing plant to Sphagnum. However the importance of competition between polytric and Sphagnum is unknown and we do not know under which conditions the association is beneficial or not.
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Groeneveld,
Groupe Recherche en Écologie des Tourbières and Centre d'Études Nordiques, Pavillon Paul-Comtois, Université Laval, Québec, Canada
Sähköposti:
ei.tietoa@nn.oo
- Rochefort, Sähköposti: ei.tietoa@nn.oo
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