The symptomatic species (from most to least sensitive) were Populus nigra, Viburnum lantana, Salix alba, Crataegus monogyna, Viburnum opulus, Tilia platyphyllos, Cornus alba, Prunus avium, Fraxinus excelsior, Ribes alpinum, and Tilia cordata Clematis spp. Plant responses to ozone varied significantly among species 11 species exhibited visible symptoms typical of exposures to ambient ozone. Plants were examined daily and dates of initial foliar injury were recorded in order to determine the cumulative AOT40 ppb h ozone exposure required to cause visible foliar injury. The study was conducted from the beginning of May through the end of August during 20 using an open-top chamber research facility located within the Lattecaldo Cantonal Forest Nursery in Canton Ticino, southern Switzerland (600 m asl). The objectives of this study were to examine the foliar sensitivity to ozone exposure of 12 tree, shrub, and herbaceous species native to southern Switzerland and determine the seasonal cumulative ozone exposures required to induce visible foliar injury. Visible ozone-induced foliar injury on native forest species of Switzerland was identified and confirmed under ambient OTC-conditions and related to the current European AOT40 standard.
Schaub, Marcus Kraeuchi, Norbert Hug, Christian Landolt, Werner Bleuler, Peter International Nuclear Information System (INIS) Ozone air pollution and foliar injury development on native plants of Switzerland
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