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Carbon balance and allocation of assimilated CO2 in Scots pine, Norway spruce, and Silver birch seedlings determined with gas exchange measurements and 14C pulse labelling

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Abstract

Carbon dioxide is released from the soil to the atmosphere in heterotrophic respiration when the dead organic matter is used for substrates for soil micro-organisms and soil animals. Respiration of roots and mycorrhiza is another major source of carbon dioxide in soil CO2 efflux. The partitioning of these two fluxes is essential for understanding the carbon balance of forest ecosystems and for modelling the carbon cycle within these ecosystems. In this study, we determined the carbon balance of three common tree species in boreal forest zone, Scots pine, Norway spruce, and Silver birch with gas exchange measurements conducted in laboratory in controlled temperature and light conditions. We also studied the allocation pattern of assimilated carbon with 14C pulse labelling experiment. The photosynthetic light responses of the tree species were substantially different. The maximum photosynthetic capacity (P max) was 2.21 μg CO2 s−1 g−1 in Scots pine, 1.22 μg CO2 s−1 g−1 in Norway spruce and 3.01 μg CO2 s−1 g−1 in Silver birch seedlings. According to the pulse labelling experiments, 43–75% of the assimilated carbon remained in the aboveground parts of the seedlings. The amount of carbon allocated to root and rhizosphere respiration was about 9–26%, and the amount of carbon allocated to root and ectomycorrhizal biomass about 13–21% of the total assimilated CO2. The 14CO2 pulse reached the root system within few hours after the labelling and most of the pulse had passed the root system after 48 h. The transport rate of carbon from shoot to roots was fastest in Silver birch seedlings.

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Authors and Affiliations

  1. Department of Forest Ecology, University of Helsinki, P.O. Box 27, 00014, Helsinki, Finland

    Jukka Sakari Pumpanen & Terhi Rasilo

  2. Department of Applied Chemistry and Microbiology, Faculty of Agriculture and Forestry, Viikki Biocenter, University of Helsinki, P.O. Box 56, 00014, Helsinki, Finland

    Jussi Heinonsalo

  3. Faculty of Agriculture and Forestry, Instrument Centre, University of Helsinki, P.O. Box 27, 00014, Helsinki, Finland

    Kaj-Roger Hurme

  4. Vantaa Research Unit, Finnish Forest Research Institute, Jokiniemenkuja 1, 01301, Vantaa, Finland

    Hannu Ilvesniemi

Authors
  1. Jukka Sakari Pumpanen
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  2. Jussi Heinonsalo
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  3. Terhi Rasilo
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  4. Kaj-Roger Hurme
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  5. Hannu Ilvesniemi
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Correspondence to Jukka Sakari Pumpanen.

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Communicated by T. Hogetsu.

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Pumpanen, J.S., Heinonsalo, J., Rasilo, T. et al. Carbon balance and allocation of assimilated CO2 in Scots pine, Norway spruce, and Silver birch seedlings determined with gas exchange measurements and 14C pulse labelling. Trees 23, 611–621 (2009). https://doi.org/10.1007/s00468-008-0306-8

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  • DOI: https://doi.org/10.1007/s00468-008-0306-8

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