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Seasonal variation of maximum photochemical efficiency in boreal Norway spruce stands |
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| Authors: | T. Lundmark Johan Bergh Martin Strand Andres Koppel |
| Affiliation: | Vindeln Experimental Forests, Swedish University of Agricultural Sciences, SE-922 91 Vindeln, Sweden Fax: +46 933 10326, SE Department for Production Ecology, Swedish University of Agricultural Sciences, P.O. Box 7042, SE-750 07 Uppsala, Sweden, SE Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Ume?, Sweden, SE Department of Ecophysiology, Institute of Zoology and Botany, Riia 181, EE-2400 Tartu, Estonia, EE |
| Abstract: | The seasonal variation in maximum photochemical efficiency of photosystem II (Fv/Fm) and the relationship between Fv/Fm and climatic factors such as irradiance, frost-nights and daily mean temperature was studied in young Norway spruce trees for 4 years in northern Sweden. As a result of night frost, the Fv/Fm-ratio gradually decreased during the autumn. There was between-year variation in the pattern of Fv/Fm in fully exposed shoots during autumn and spring, largely as an effect of differing temperature conditions. During spring, there was a strong apparent relationship between daily mean temperature and Fv/Fm within the temperature range –3 to 12°C. The light regime to which the needles were exposed during winter affected Fv/Fm, and moderately shaded shoots from the bottom of the canopy generally had a higher Fv/Fm-ratio than fully exposed shoots from the top of the canopy. Received: 1 October 1997 / Accepted: 16 June 1998 |
| Keywords: | Chlorophyll a fluorescence Low-temperature stress Photoinhibition Picea abies |
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