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Annals of Botany 77: 469-476, 1996
© 1996 Annals of Botany Company

Optimal Control of Gas Exchange during Drought: Empirical Evidence

FRANK BERNINGER, ANNIKKI MÄKELÄ and PERTTI HARI

Department of Forest Ecology, PL 24 (Unioninkatu 40), FIN-00014 University of Helsinki, Finland

February 13, 1995 ; November 17, 1995

The optimal regulation model by Mäkelä, Berninger and Hari (Annals of Botany 77: 461–467, 1996) was applied to data for photosynthesis and transpiration of Scots pine during a 22-d drought period. There was a clear decrease in photosynthesis and transpiration during that period. The agreement between model and photosynthesis data was good. The residuals of photosynthesis were not systematic with respect to temperature, irradiance or water vapour deficit. However, the model initially overestimated transpiration by 50%, although there was a clear linear relationship between measured and estimated values. The results suggest that there was no decrease in photosynthetic capacity during the period, but a decrease in stomatal conductance was responsible for the changes in photosynthesis and transpiration. The observations are similar to results in the literature.

Transpiration; photosynthesis; stomatal conductance; drought; Pinus sylvestris


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