Artikkelit jotka sisältää sanan 'fens'

Jukka Turunen. Luonnontilaisten soiden pitkänajan- ja nykykertymät boreaalisella ja subarktisella kasvillisuusvyöhykkeellä: katsaus.
English title: Past and present carbon accumulation in undisturbed boreal and subarctic mires: a review.
Avainsanat: fens; climate change; carbon accumululation; bogs; boreal region; subarctic region; Holocene
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This review integrates the results from several recent studies on carbon (C) accumulation in undisturbed boreal and subarctic mire ecosystems in Finland, Sweden, Russia, Canada, and USA. Generally, a large variation in the average long-term apparent rate of carbon accumulation (LORCA) has been found among mires based on the mire type, age and geographical location. The differences in LORCA between the raised bog region and the aapa mire regions were found to be significant. The updated LORCA for undrained boreal and subarctic mire regions has been estimated at 13–20 g C m–2 a–1 throughout the Holocene, which is clearly lower than previous estimates for these northern mire regions. The age of the peat column is an important predictor of C accumulation and has to be taken into account when comparing results. The results indicate a rapid mire expansion in southern Finland from ca. 10 500 to 8500 cal. year BP, from 5000 to 3000 cal. year BP and around 2000 cal. year BP. In northern Finland the extensive mire expansion occurred from ca. 10500 to 8000 cal. year BP. The recent apparent rate of C accumulation (RERCA) in boreal and subarctic mire regions over the past 100 to 200 years ranges from 30 to 120 g C m-2 a-1. The future C balance scheme of mires is also briefly discussed. Key words: carbon accumulation, bogs, fens, boreal region, subarctic region, Holocene, climate change
  • Turunen, Geological Survey of Finland, Kuopio Unit, P.O. Box 1237, 70211 Kuopio, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
Mara Pakalne, Laimdota Kalnina. Latvian suot.
English title: Mires in Latvia.
Avainsanat: fens; raised bogs; Mire development
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Both minerotrophic (fens and transitional mires) and ombrotrophic (raised bogs) mires occur in Latvia. Distribution of mires and diversity of mire vegetation are determined by geology of area, origin of mires and climatic differences between coastal and continental parts of Latvia. Fens started to develop in the early Holocene in the Preboreal 10 000 years BP. Later, during the Atlantic many fens transformed into transitional mires and gradually into raised bogs. Today Latvian mires are represented by all these types and they cover 4.9% of the country. Mires are protected in the North Vidzeme Biosphere Reserve, National Parks (Slitere, Kemeri and Gauja), Strict Nature Reserves (TeiEi, Krustkalni and Gripi), Nature parks and 140 nature reserves, as well as in protected landscape areas.
  • Pakalne, Department of Botany and Ecology, university of Latvia, Kronvalda Boulevard 4, LV-1586, Riga, Latvia Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Kalnina, Sähköposti: ei.tietoa@nn.oo
Anneli Ylimartimo. Lapin kolmion lettoisista soista.
English title: The rich fens of the Lapland triangle region.
Avainsanat: fens; peatland drainage; endangered species; conservation
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The Lapland triangle region, located between the lower courses of the rivers Tornion-joki and Kemijoki in NW-Finland covers an area of 3500 km2. The region is renowed for its concentration of rich fen mire site types, including Campylium stellatum — Limprichtia intermedia — rich fens, eutrophic flark fens, eutrophic birch fens, eutrophic pine mires and eutrophic spruce mires. Peatlands cover about 60 % of the total land area of the region. By the end of the 1970's some 90 % of the area of rich fens had been drained and utilized for cultivation and forestry purposes and several plant species had become endangered. Although some 20 sites have been listed for conservation, enforcement so far has been very limited. Keywords: fens, peatland drainage, endangered species, conservation.
  • Ylimartimo, Department of Silviculture, University of Helsinki, Unioninkatu 40 B, SF-00I70, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)

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