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Volume 18, issue 18
Atmos. Chem. Phys., 18, 13321-13328, 2018
https://doi.org/10.5194/acp-18-13321-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Pan-Eurasian Experiment (PEEX)

Atmos. Chem. Phys., 18, 13321-13328, 2018
https://doi.org/10.5194/acp-18-13321-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 18 Sep 2018

Research article | 18 Sep 2018

Prediction of photosynthesis in Scots pine ecosystems across Europe by a needle-level theory

Pertti Hari1, Steffen Noe2, Sigrid Dengel3, Jan Elbers4, Bert Gielen5, Veli-Matti Kerminen6, Bart Kruijt4, Liisa Kulmala1, Anders Lindroth7, Ivan Mammarella6, Tuukka Petäjä6, Guy Schurgers8, Anni Vanhatalo1, Markku Kulmala6, and Jaana Bäck1 Pertti Hari et al.
  • 1Institute for Atmospheric and Earth System Research INAR, Department of Forest Sciences, Faculty of Agriculture and Forestry, P.O. Box 27, 00014, University of Helsinki, Finland
  • 2Department of Plant Physiology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51014 Tartu, Estonia
  • 3Lawrence Berkeley National Laboratory, Climate and Ecosystem Sciences Division, 1 Cyclotron Road 84-155, Mail Stop 074-0316, Berkeley, CA 94720-8118, USA
  • 4Wageningen University and Research, Water Systems and Global Change Group, P.O. Box 47, 6700AA Wageningen, the Netherlands
  • 5Department of Biology, University of Antwerp, 2610 Wilrijk, Belgium
  • 6Institute for Atmospheric and Earth System Research INAR, Faculty of Science, P.O. Box 68, 00014, University of Helsinki, Finland
  • 7Department of Physical Geography and Ecosystem Sciences, Lund University, 22362 Lund, Sweden
  • 8University of Copenhagen, Department of Geosciences and Natural Resource Management, Øster Voldgade 10, 1350 Copenhagen, Denmark

Abstract. Photosynthesis provides carbon for the synthesis of macromolecules to construct cells during growth. This is the basis for the key role of photosynthesis in the carbon dynamics of ecosystems and in the biogenic CO2 assimilation. The development of eddy-covariance (EC) measurements for ecosystem CO2 fluxes started a new era in the field studies of photosynthesis. However, the interpretation of the very variable CO2 fluxes in evergreen forests has been problematic especially in transition times such as the spring and autumn. We apply two theoretical needle-level equations that connect the variation in the light intensity, stomatal action and the annual metabolic cycle of photosynthesis. We then use these equations to predict the photosynthetic CO2 flux in five Scots pine stands located from the northern timberline to Central Europe. Our result has strong implications for our conceptual understanding of the effects of the global change on the processes in boreal forests, especially of the changes in the metabolic annual cycle of photosynthesis.

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The development of eddy-covariance measurements of ecosystem CO2 fluxes began a new era in the field studies of photosynthesis. The interpretation of the very variable CO2 fluxes in evergreen forests has been problematic especially in seasonal transition times. We apply two theoretical needle-level equations and show they can predict photosynthetic CO2 flux between the atmosphere and Scots pine forests. This has strong implications for the interpretation of the global change and boreal forests.
The development of eddy-covariance measurements of ecosystem CO2 fluxes began a new era in the...
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