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During the growing seasons 1986 to 1993 we examined the effects of ozone (O 3 ) on the gas exchange of mature Norway spruce (Picea abies) and European larch (Larix decidua) trees under field conditions at a low and a high elevation site. Twigs were enclosed in chambers and exposed to different O 3 concentrations for one or two seasons tracking ambient climatic conditions. After one...
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