Artikkelit jotka sisältää sanan 'bogs'

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
Cécile Wastiaux, Lucien Halleux, René Scumacker, Maurice Streel, jean-Michel Jacqmotte. Development of the Hautes-Fagnes peat bogs (Belgium): new perspectives using ground-penetrating radar.
Avainsanat: raised bogs; ground-penetrating radar; Hautes-Fagnes
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A 800 ha area of drained peatlands in the Hautes-Fagnes (Belgium) was surveyed by means of a ground-penetrating radar and a global positioning system.The survey pro vided very accurate information about the subsurface relief and the thickness and extent of the peat deposit, as well as stratigraphical information and suggestions of possible links between subsurface, hydrology and present vegetation.
  • Wastiaux, Université de Liège, Station scientifique des Hautes-Fagnes, rue de Botrange, 137, B-4950 Robertville, Belgium Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Halleux, Sähköposti: ei.tietoa@nn.oo
  • Scumacker, Sähköposti: ei.tietoa@nn.oo
  • Streel, Sähköposti: ei.tietoa@nn.oo
  • Jacqmotte, Sähköposti: ei.tietoa@nn.oo
Pekka Salminen. Irlannin suot ja niiden suojelu.
English title: Irish mires and their conservation.
Avainsanat: Blanket bogs; Ireland; raised bogs
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Originally over 17 per cent of the land area of Ireland was covered by mires. The Irish and Scotch occurrences of blanket bogs are among the most important in the world. There have also been excellent raised bog areas especially in the low-lying central plateau of Ireland. Due to turf burning, peat extraction and drying of peatlands during hundreds of years, the occurrence of mires in their natural state is becoming rare. Only some 100 000 hectares of scientifically and conservationally valuable peatlands are remaining, which is less than 10 per cent of the total peatland area of the country. Increasing international and national pressures for mire conservation have forced the Irish government to define goals for national mire conservation. According to the programme, 10 000 ha of raised bogs (3.2% of the original raised bog areas) and 40 000 ha of blanket bogs (5.2% of the original blanket bog areas), as well as a couple of thousand hectares of the remnants of the rich open fens are to be preserved. Yet, there are not adequate preservation resources available. Only one-third of the mire protection goals have been achieved. Keywords: Blanket bogs, Ireland, raised bogs
  • Salminen, Ministry of Environment, P.O. Box 399, SF-00121 Helsinki, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)

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