Artikkelit jotka sisältää sanan 'charcoal'
Determination of recent apparent carbon accumulation in peat using dated fire horizons.
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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
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Alm,
Department of Biology, University of Joensuu, P.O. Box 111, FIN-80100 Joensuu, Finland
Sähköposti:
ei.tietoa@nn.oo
- Tolonen, Sähköposti: ei.tietoa@nn.oo
- Vasander, Sähköposti: ei.tietoa@nn.oo
Turvetutkimus Suomen asutushistorian selvittämisessä.
English title: Settlement history of Finland traced by means of microfossil analyses of peat deposits.
Avainsanat:
peatland;
archaeometry;
charcoal particles;
loss-on-ignition;
pollen analysis;
settlement history
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Information on early settlement history in SW Finland has increased considerably as a result of archaeometrical studies including pollen analysis, charcoal analysis and loss-on-ignition analysis of peat deposits, especially of Sphagnum peat. The results together with 14C-datings, show that the introduction of agriculture took place from the S-SW in the SW archipelago as early as 3600±90 BP (before present). This, however, does not explain the early pollen and charcoal dust evidence of cultivation in the Kainuu district where corresponding darings of 3680±90 BP have recently been obtained, or in Siilinjarvi where evidence of early cultivation around 3000 BP has also been recorded.
Keywords: archaeometry, charcoal particles, loss-on-ignition, peatland, pollen analysis, settlement history
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Vuorela,
The Geological Survey of Finland, Betonimiehenkuja 4, SF-02150 Espoo, Finland
Sähköposti:
ei.tietoa@nn.oo
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