title: Seasonal trends in reduced leaf gas exchange and ozone-induced foliar injury in three ozone sensitive woody plant species.
abstract: Seasonal trends in leaf gas exchange and ozone-induced visible foliar injury were investigated for three ozone sensitive woody plant species. Seedlings of Populus nigra L., Viburnum lantana L., and Fraxinus excelsior L. were grown in charcoal-filtered chambers, non-filtered chambers and open plots. Injury assessments and leaf gas exchange measurements were conducted from June to October during 2002. All species developed typical ozone-induced foliar injury. For plants exposed to non-filtered air as compared to the charcoal-filtered air, mean net photosynthesis was reduced by 25%, 21%, and 18% and mean stomatal conductance was reduced by 25%, 16%, and 8% for P. nigra, V. lantana, and F. excelsior, respectively. The timing and severity of the reductions in leaf gas exchange were species specific and corresponded to the onset of visible foliar injury.
authors.affiliation: Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland. kristopher.novak@wsl.ch
authors.forename: K
authors.initials: K
authors.lastname: Novak
authors.forename: M
authors.initials: M
authors.lastname: Schaub
authors.forename: J
authors.initials: J
authors.lastname: Fuhrer
authors.forename: J M
authors.initials: JM
authors.lastname: Skelly
authors.forename: C
authors.initials: C
authors.lastname: Hug
authors.forename: W
authors.initials: W
authors.lastname: Landolt
authors.forename: P
authors.initials: P
authors.lastname: Bleuler
authors.forename: N
authors.initials: N
authors.lastname: Kräuchi
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D031661:Fraxinus / Q000187:drug effects / Q000378:metabolism; D005740:Gases / Q000378:metabolism*; D031298:Mimosa / Q000187:drug effects / Q000378:metabolism; D010083:Oxidants, Photochemical / Q000633:toxicity*; D010126:Ozone / Q000633:toxicity*; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects*; D032107:Populus / Q000187:drug effects / Q000378:metabolism; D012621:Seasons; D013045:Species Specificity; D014887:Weather
chemical_list: D000393:Air Pollutants; D005740:Gases; D010083:Oxidants, Photochemical; D010126:Ozone