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Chamber experiments on juvenile trees have resulted in severe injury and accelerated loss of leaves along with reduced biomass production under chronically enhanced O 3 levels. In contrast, the few studies conducted on adult forest trees in the field have reported low O 3 sensitivity. In the present study, young beech in phytotrons was more sensitive to O 3 than adult beech...
The current AOT40 concept for inferring risks in forest trees by ozone (O 3 ) injury is based on an accumulated external O 3 exposure rather than an internal O 3 dose or uptake rate. AOT40 assumes O 3 concentrations below 40nll -1 and night-time exposure to be negligible. Hence, this concept is rather inconsistent with observed forest conditions. In contrast,...
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