Abstract
Recovery from winter depression of photosynthesis was studied in Pinus sylvestris, Pinus conforta and Picea abies by means of chlorophyll fluorescence and gas exchange measurements. During the winter 1986–1987 the fluorescence yield was low and no variable fluorescence was detectable before the end of March. In the field recovery of variable fluorescence/maximum fluorescence (Fv/Fm) during spring was slow for all three species studied. The temperature dependence of recovery was confirmed from measurements of the potential rate of recovery of Fv/Fm at different temperatures in the laboratory. At 20° C, Fv/Fm increased from 0.1 to 0.8 within 3 days. Recovery of Fv/Fm was paralleled by an increase in apparent photon yield. No significant differences could be demonstrated between the studied tree species in potential rate of recovery in the laboratory or in actual recovery in the field.
Published Version
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