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Tuula Aalto (email), Pertti Hari, Timo Vesala

Comparison of an optimal stomatal regulation model and a biochemical model in explaining CO2 exchange in field conditions

Aalto T., Hari P., Vesala T. (2002). Comparison of an optimal stomatal regulation model and a biochemical model in explaining CO2 exchange in field conditions. Silva Fennica vol. 36 no. 3 article id 529. https://doi.org/10.14214/sf.529

Abstract

Gas exchange of Pinus sylvestris L. was studied in subarctic field conditions. Aspects on optimal control of the gas exchange were examined using approach by Hari et al. (Tree Phys. 2: 169–175, 1986). Biochemical model by Farquhar et al. (Planta 149: 78–90, 1980) was utilized to describe the photosynthetic production rate of needles. The model parameters were determined from field measurements. The results from the optimization approach and biochemical model were compared and their performance was found quite similar in terms of R2 calculated using measured exchange rates (0.89 for optimization model and 0.85 for biochemical model). Minor differences were found in relation to responses to intercellular carbon dioxide concentration and temperature.

Keywords
photosynthesis; CO2 exchange; biochemical model; optimization; Pinus sylvestris L.; Scots pine

Author Info
  • Aalto, Finnish Meteorological Institute, Air Quality Research, Sahaajankatu 20 E, FIN-00810 Helsinki, Finland ORCID ID:E-mail tuula.aalto@fmi.fi (email)
  • Hari, University of Helsinki, Dept. of Forest Ecology, P.O. Box 27, FIN-00014 University of Helsinki, Finland ORCID ID:
  • Vesala, University of Helsinki, Dept. of Physics, P.O. Box 64, FIN-00014 University of Helsinki, Finland ORCID ID:

Received 3 October 2000 Accepted 3 April 2002 Published 31 December 2002

Available at https://doi.org/10.14214/sf.529 | Download PDF

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