Consequences of elevated CO2 and O3 on birch canopy structure
2002
Kull, O. (University of Tartu, Tartu (Estonia). Institute of Botany and Ecology) | Tulva, I. | Vapaavuori, E.
We studied elevated CO2 and ozone effects in single and in combination on crown structure of two Betula pendula clones. Shoot ramification, shoot length, number of metamers, leaves and buds were measured at four heights in every tree. Chamber effect was substantial on sylleptic branching and on shoot length and ramification. However these responses differed between the clones. Ozone treatment affected shoot length and caused slight decrease in shoot ramification. Elevated CO2 affected appearance of long shoots in complex manner, but in lower crown positions CO2 caused increased number of long shoots in both clones
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