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Seasonal variability of maximum quantum yield of PSII photochemistry (Fv/Fm) was studied in needles of Taxus baccata seedlings acclimated to full light (HL, 100% solar irradiance), medium light (ML, 18% irradiance) or low light (LL, 5% irradiance). In HL plants, Fv/Fm was below 0.8 (i.e. state of photoinhibition) throughout the whole experimental period from November to May, with the greatest decline...
We studied the down-regulation of PS II in saplings of the shade tolerant tree Abies alba Mill. growing under light-permeable canopy of Larix decidua characterised by high canopy openness (ca 40%) and under dense canopy formed by Picea abies of low openness (ca 18%) in the Karkonosze National Park. The seasonal pattern of maximum (dark adapted) quantum yield of PS II (FV/Fm) during the 2001 season,...
To determine the influence of tree canopy composition on growth and physiological performance of silver fir (Abies alba Mill.) in Karkonoski National Park (Sudety Mountains, Southern Poland), three-year-old fir seedling were planted in five forest stands dominated by Betula pendula, Fagus sylvatica, Larix decidua, Picea abies or Pinus sylvestris. The stands differed in canopy openness such that young...
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