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Estimating carbon accumulation rates of undrained mires in Finland–application to boreal and subarctic regions

Department of Biology, University of Joensuu, PO Box 111, FIN-80101 Joensuu, Finland; Department of Geography and the Centre for Climate and Global Change Research, McGill University, Montreal, Quebec, H3A 2K6 Canada turunenKfelix.geog.mcgill.ca

Erkki Tomppo

Finnish Forest Research Institute, Unioninkatu 40 A, FIN-00170 Helsinki, Finland

Kimmo Tolonen

Department of Biology, University of Joensuu, PO Box 111, FIN-80101 Joensuu, Finland

Antti Reinikainen

Finnish Forest Research Institute, PL 18, FIN-01301 Vantaa, Finland

Equations based on empirical relationships of peat physical properties were used to estimate the average long-term apparent rate of carbon accumulation (LORCA) in Finnish mire vegetation regions. The results were generalized to the boreal and subarctic regions. Analyses of 1302 dated peat cores were used to infer carbon accumulation for each mire vegetation region of Finland. The area-weighted LORCA for Finnish undrained mire areas was 18.5 g m 2 yr 1 and the total carbon sink 0.79 Tg yr 1 (1 Tg = 10¹²g). The total carbon pool of Finnish undrained mires was estimated as 2257 Tg. The aapa-mire region included 80% of the total net accumulation rate of carbon and 85% of the total carbon reservoirs of Finnish undrained mires. LORCA was signi" cantly higher in the raised-bog region, 26.1 g m 2 yr 1, compared with the aapa-mire region, 17.3 g m 2 yr 1, and bogs generally had a higher LORCA 20.8 g m 2 yr 1, than fens 16.9 g m 2 yr 1. The total C sink for boreal and subarctic mires was estimated at 66 Tg yr 1 which is about 31% lower than the previous estimates. The total C pool of all boreal and subarctic mires was estimated at 270–370 Pg (1 Pg = 10¹⁵g).

Key Words: Carbon accumulation • mires • bogs • fens • boreal region • subarctic region • Holocene • Finland

The Holocene, Vol. 12, No. 1, 69-80 (2002)
DOI: 10.1191/0959683602hl522rp


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