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Upek, Boris; Minkkinen, Kari; Kolari, Pasi; Starr, Mike; Chan, Tommy; Alm, Jukka; Vesala, Timo; Laine, Jukka; Nikinmaa, Eero (2011)
Publisher: Tellus B
Journal: Tellus B
Languages: English
Types: Article
Subjects:
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 (GPP), and R from 1263 to 2813 gCO2m-2yr-1 (70–98%) to gross ecosystem respiration (GR).DOI: 10.1111/j.1600-0889.2007.00328.x
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