Physiological ozone responses of birch (Betula pendula Roth) differ between soil-growing trees in a multi-year exposure and potted saplings in a single-season exposure
2002
Oksanen, E. (University of Kuopio, Kuopio (Finland). Department of Ecology and Environemntal Science)
Increased ozone sensitivity of larger soil-growing trees with growth in the multi-year exposure was a result of several interactive senescence-related physiological factors: lower net photosynthesis to stomatal conductance ratio at the end of the growing season promoted high ozone uptake and low photosynthetic carbon gain, leading to onset of visible injuries and impaired bud formation. This was expected to affect negatively the early growth of the next year foliage, This clone showed a major change in allocation pattern during the early ontogeny at the expense of foliage growth towards the stem height increase
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