Jukka Alm , Kimmo Tolonen, Harri Vasander

Determination of recent apparent carbon accumulation in peat using dated fire horizons

Alm J., Tolonen K., Vasander H. Determination of recent apparent carbon accumulation in peat using dated fire horizons.

Tiivistelmä

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

Avainsanat
dating; fire; Carbon accumulation; charcoal; dendrochronology

Vastaanotettu 31.10.2017 Julkaistu 1.1.1992

Katselukerrat 1713

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