Artikkelit kirjoittajalta Päivi Paasovaara
Kuusamon suokasvillisuus ja ojitustilanne.
English title: Mire site types and peatland drainage in Kuusamo, northern Finland.
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The percentage distribution of mire site types on 49 random sample plots (1/4 km2) was studied in 1989. The line transect method was used, the total mire transect line on the sample plots being 100,6 km. The eight most common mire site types include different pine bog types (hummock level bogs/pine mires) and fens. Both poor fens and rich fens are more common in Kuusamo than in the Pohjanmaa aapa mires (southern aapa mires), the former ones taking 29% and the latter ones 8% of all mires. The percentage of spruce mires (6% ) is no more than a half of their percentage in the Pohjanmaa aapa mires. 32% of the peatlands studied were under the influence of drainage, mainly with open ditch networks for forestry. 16% of those were classified as recently drained, 73% as transitional, 5% as drained peatland forests and 6% as being influenced by drainage in the vicinity. Open fens and thick peated mire types have been drained to a lesser extent than forested mires and sites with mire margin effect. However, as only few mire site types are suitable for forestry in northern Finland, the risk of unprofitable drainage is high. Mire site types considered unsuitable for forestry even in the more favourable conditions of southern Finland take about 35% of the drained mires.
Keywords: Aapa mire area, draining for forestry, field survey, mire vegetation, Peräpohjola
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Paasovaara,
Keskuskoulu B 7, FIN-86710 Kärsämäki, Finland
Sähköposti:
ei.tietoa@nn.oo
Kaksi rinnesuota Riisitunturin kansallispuistosta.
English title: The nature of two sloping mires in the Riisitunturi national park, northern Finland.
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The vegetation (mapped with the point method), mire profiles and peat depth are very shortly described (Fig. 2 and 3, tables in the text). Typical of the sloping mires above 300 m a.s.l. are Sphagnum fuscum and Carex globularis spruce-pine mires along the marginal parts of the mire complexes.
The middle parts of the mires are often dominated by oligo- and mesotrophic flark fens and Molinia caerulea – Scripus cespitosus – Spagnum compactum - Ptilidium ciliare vegetation; the last mentioned is very similar to the northern boreal short-sedge fen vegetation at the west coast of Northern Norway. Mesotrophic springs and springy patches or stripes are common. All this reflects poor bedrock and hygrid oceanic climate (the temperature climate is continental). This has caused a heavy paludification of the heath (forest) vegetation. Carex-Sphagnum and Sphagnum peats with wood remains dominate usually. Overgrown places can be traced occasionally in the top parts of the mires.
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Eurola,
Sähköposti:
ei.tietoa@nn.oo
- Huttunen, Sähköposti: ei.tietoa@nn.oo
- Huttunen, Sähköposti: ei.tietoa@nn.oo
- Paasovaara, Sähköposti: ei.tietoa@nn.oo
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