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Key messageAfter controlling for the effects of size and light, partial regression revealed that height growth of common beech saplings was negatively affected by sapling age. Abstract Common beech (Fagus sylvatica L.) saplings were studied along gradients of light availability (4–82 % of full sunlight), initial size (9–290 cm), and age (2–25 years) to examine the interactive effect of these...
Key messageOur study provides evidence that neither elevated CO2nor elevated O3alters the positive asymmetric competition for light and the symmetric competition for water among beech and spruce individuals grown in monoculture. We conclude that the mechanism of competition (i.e. symmetric/asymmetric) above (e.g shading or overtopping effect) and belowground (e.g. non-preemption or foraging) rather than abiotic treatments such as elevated CO...
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