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Discussion papers | Copyright
https://doi.org/10.5194/acp-2017-533
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Aug 2017

Research article | 04 Aug 2017

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

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

Pertti Hari1, Steffen Noe2, Sigrid Dengel3, Jan Elbers4, Bert Gielen5, Tiia Grönholm6, Veli-Matti Kerminen6, Bart Kruijt4, Liisa Kulmala1, Samuli Launiainen7, Anders Lindroth8, Tuukka Petäjä6, Guy Schurgers9, Anni Vanhatalo1, Timo Vesala1,6, Markku Kulmala6, and Jaana Bäck1 Pertti Hari et al.
  • 1University of Helsinki, Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland
  • 2Estonian University of Life Sciences, Institute of Agricultural and Environmental Sciences, Department of Plant Physiology, Kreutzwaldi 1, EE-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 Environmental Research, P.O. Box 47, 6700AA Wageningen, Netherlands
  • 5University of Antwerp, Department of Biology, 2610 Wilrijk, Belgium
  • 6University of Helsinki, Department of Physics, P.O. Box 68, FI-00014, University of Helsinki, Finland
  • 7Natural Resources Institute Finland, Latokartanonkaari 9, FI-00790 Helsinki, Finland
  • 8Lund University, Department of Physical Geography and Ecosystem Sciences, 22362 Lund, Sweden
  • 9University 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 fact generates the key role of photosynthesis in the carbon dynamics of ecosystems (Taiz et al., 2015) and biogenic CO2 consumption. The development of eddy covariance measurements of ecosystem CO2 fluxes started a new era in the field studies of photosynthesis (Baldocchi et al., 2000). 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 with photosynthesis. We then show that these equations are able to predict quite precisely and accurately the photosynthetic CO2 flux between the atmosphere and different ecosystems in five Scots pine stands located from northern timberline to Central Europe. Our result has strong implications on the interpretation 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 started 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 on the interpretation of the global change and boreal forests.
The development of eddy covariance measurements of ecosystem CO2 fluxes started a new era in the...
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