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

Article English OPEN
Upek, Boris ; Minkkinen, Kari ; Kolari, Pasi ; Starr, Mike ; Chan, Tommy ; Alm, Jukka ; Vesala, Timo ; Laine, Jukka ; Nikinmaa, Eero (2011)

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
  • References (37)
    37 references, page 1 of 4

    Alm, J., Talanov, A., Saarnio, S., Silvola, J., Ikkonen, E. and co-authors. 1997. Reconstruction of the carbon balance for microsites in a boreal oligotrophic pine fen, Finland. Oecologia 110, 423-431.

    Alm, J., Schulman, L., Walden, J., Nyka¨nen, H., Martikainen, P. J. and co-authors. 1999. Carbon balance of a boreal bog during a year with an exceptionally dry summer. Ecology 80, 161-174.

    Aurela, M., Laurila, T. and Tuovinen, J. P. 2004. The timing of snow melt controls the annual CO2 balance in a subarctic fen. Geophysical Research Letters 31, 31:L16119. doi: 632 10.1029/2004GL020315.

    Cajander, A. K. 1949. Forest types and their significance. Acta Forestalia Fennica 56, 1-69.

    Chen, W., Zhang, Q., Cihlar, J., Bauhus, J. and Price, D. T. 2004. Estimating fine-root biomass and production of boreal and cool temperate forests using aboveground measurements: A new approach. Plant Soil 265, 31-46.

    Davidson, E. A., Richardson, A. D., Savage, K. E. and Hollinger, D. Y. 2006. A distinct seasonal pattern of the ratio of soil respiration to total ecosystem respiration in a spruce-dominated forest. Global Change Biol. 12(2), 230-239.

    Frazer, G. W., Canham, C. D. and Lertzman, K. P. 1999. Gap Light Analyzer (GLA), Version 2.0: Imaging software to extract canopy structure and gap light transmission indices from true-colour fisheye photographs, users manual and program documentation. Copyright c 1999: Simon Fraser University, Burnaby, British Columbia and the Institute of Ecosystem Studies, Millbrook, New York. Available at: http://www.rem.sfu.ca/forestry/downloads/gap light analyzer.htm Gran o¨, J. G., Jurva, R., Kera¨nen, J., Kujala, V., Laitakari, A. and coauthors. 1952. Suomi, a general handbook on the geography of Finland. Fennia 72, 74-99.

    H o¨gberg, P., Nordgren, A., Buchmann, N., Taylor, A. F. S., Ekblad, A. and co-authors. 2001. Large-scale forest girdling shows that current photosynthesis drives soil respiration. Nature 411, 789-792.

    IUSS Working Group WRB. 2006. World reference base for soil resources 2006. World Soil Resources Reports No. 103. FAO, Rome.

    Janssens, I. A., Lankreijer, H., Matteucci, G., Kowalski, A. S., Buchmann, N. and co-authors. 2001. Productivity overshadows temperature in determining soil and ecosystem respiration across European forests. Global Change Biology 7(3), 269-278. doi: 10.1046/j.1365-2486.2001.00412.x

  • Metrics
    No metrics available
Share - Bookmark