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The Holocene
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A basin-based approach to the long-term history of forest fires as determined from peat strata

Aki Pitkänen

Department of Ecology, Karelian Institute, University of Joensuu, Finland Aki.pitkanen{at}joensuu.fi

Kimmo Tolonen

Department of Biology, University of Joensuu, Finland

Högne Jungner

Dating Laboratory, University of Helsinki, Finland

Valid reconstruction of long-term forest fire histories from individual peat cores usually fails, for a number of reasons, even though visible charcoal horizons in peat are indisputable evidence of local orin-situ fires. Both the dating and reliability of fire records from peat can be improved by the means of a ‘basin-based approach’, in which the gradual lateral growth of the peat is studied carefully by means of numerous dated basal peat samples. Applying this principle, the frequency of forest fires in an esker landscape in southern Finland was elucidated over the past 7000 years. The results indicate that a period of active land use, but undeveloped fire control in the area, reduced the mean fire interval from the natural background fromc. 130 years toc. 40 years.

Key Words: Forest fires • peat • radiocarbon dating • fire frequency • boreal forest • climate • Finland • Holocene

The Holocene, Vol. 11, No. 5, 599-605 (2001)
DOI: 10.1191/095968301680223558
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