Artikkelit jotka sisältää sanan 'fire'

Jukka Alm, Kimmo Tolonen, Harri Vasander. Determination of recent apparent carbon accumulation in peat using dated fire horizons.
Avainsanat: dating; fire; Carbon accumulation; charcoal; dendrochronology
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Two charcoal layers, originating from two forest fires, were found at between 7 and 58 cm in the peat of Lakkasuo mire. Using dendro-chronological techniques and fire scars on Scots pine {Pinus sylvestris L.) stumps, the date when these two layers was deposited could be estimated. The earlier fire swept over the mire about 1780 A.D. and the later fire, which seems to have been limited to the eastern part of Lakkasuo, occurred in 1845 A.D. Knowing the thickness of the peat layer above the dated charcoal layers, its bulk density and carbon content, the rate of carbon accumulation during the last 212-147 years could therefore be calculated for different site types in the Lakkasuo mire complex. These values ranging from 39.8 to 80.7 g C m-2 a-1. can be compared to those (28.5-42.8 g C m-2 a-1 ) 0f the peat layer down to a still older fire horizon dated using the AMS radiocarbon "wiggle matching" technique at 1040 ± 90 B.P. Keywords: Carbon accumulation, charcoal, dating, dendrochronology, fire
  • Alm, Department of Biology, University of Joensuu, P.O. Box 111, FIN-80100 Joensuu, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Tolonen, Sähköposti: ei.tietoa@nn.oo
  • Vasander, Sähköposti: ei.tietoa@nn.oo
Kimmo Tolonen. Mitä suoarkistot voivat meille tulevaisuudessa kertoa?
English title: What would be the significance of peat archives in the future?
Avainsanat: Carbon balance; dating; fire; DDT; global warming; heavy metals; PAHs
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An attempt is made to predict the progress of mire palaeoecological research in the near future. The prognosis is made in the light of recent advances in the field. Examples of some multi-faceted topics are given. They include ancient climatic changes for understanding the present changes, the greenhouse-effect, problems and new innovations in dating, organic pollutants such as PAHs and DDT, heavy metals and related air pollutants, man-made radionuclides, initiation of peatlands, peat growth, and fire history. Keywords: Carbon balance, dating, fire, DDT, global warming, heavy metals, PAHs
  • Tolonen, Department of Biology, University of Joensuu, P.O. Box 111, SF-80101 Joensuu, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)

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