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Original Research Papers

Forest floor versus ecosystem CO2 exchange along boreal ecotone between upland forest and lowland mire

Authors:

Boris Ťupek ,

Dept. Forest Ecology, P.O. Box 27, 00014 Univ. of Helsinki, FI
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Kari Minkkinen,

Dept. Forest Ecology, P.O. Box 27, 00014 Univ. of Helsinki, FI
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Pasi Kolari,

Dept. Forest Ecology, P.O. Box 27, 00014 Univ. of Helsinki, FI
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Mike Starr,

Dept. Forest Ecology, P.O. Box 27, 00014 Univ. of Helsinki, FI
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Tommy Chan,

University of Toronto, 27 King’s College Circle, Toronto, ON M5S 1A1, CA
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Jukka Alm,

Finnish Forest Research Institute, P.O. Box 68, 80101 Joensuu, FI
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Timo Vesala,

Dept. of Physical Sciences, P.O. Box 64, 00014 Univ. of Helsinki, FI
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Jukka Laine,

Finnish Forest Research Institute, Kaironiementie 54, 39700 Parkano, FI
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Eero Nikinmaa

Dept. Forest Ecology, P.O. Box 27, 00014 Univ. of Helsinki, FI
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Abstract

We determined the landscape variation of forest floor (FF) CO2 uptake (photosynthesis, P), FF CO2 emission (respiration, R) in relation to net ecosystem CO2 exchange (NEE) and environmental factors along a forest-mire ecotone in Finland. The 450 m long ecotone extended from xeric, upland pine dominated habitats, through spruce and transitional spruce-pine-birch forest, to sedge peatlands downslope. The CO2 fluxes were measured at nine stations during 2005 using chamber and IR techniques. Instantaneous P and R measurements for each station were interpolated by fitting their response to continuous records of light (mean R2 = 0.66) and temperature (mean R2 = 0.77) recorded nearby to give annual estimates. Stand biomass increment was used to estimate the annual CO2 exchange contribution of the trees. Annual P values from -307 to -1632 gCO2m-2yr-1 were inversely correlated with FF light (r = -0.96), FF above-ground biomass (r=-0.92) and canopy openness (r=-0.95). Annual R values from 1263 to 2813 gCO2 m-2 yr-1 were correlated with tree stand foliar biomass (r = 0.77). Estimated NEE values varied from 546 to -1679 gCO2m-2/yr-1, with P contributing from -307 to -1632 gCO2m-2yr-1 (4–90%) to gross ecosystem photosynthetic production, and R from 1263 to 2813 gCO2m-2yr-1 (70–98%) to gross ecosystem respiration (GR).

How to Cite: Ťupek, B., Minkkinen, K., Kolari, P., Starr, M., Chan, T., Alm, J., Vesala, T., Laine, J. and Nikinmaa, E., 2008. Forest floor versus ecosystem CO2 exchange along boreal ecotone between upland forest and lowland mire. Tellus B: Chemical and Physical Meteorology, 60(2), pp.153–166. DOI: http://doi.org/10.1111/j.1600-0889.2007.00328.x
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  Published on 01 Jan 2008
 Accepted on 20 Sep 2007            Submitted on 30 Dec 2006

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