Abstract
Four-year-old beech seedlings were fumigated with three levels of ozone for 2 consecutive years in open-top chambers. During the second growth season different physiological measurements were conducted before and during daily fumigation. A 25–40% decrease in net photosynthesis was seen during fumigation, whereas no differences were detected before fumigation in July. In August lasting effects in net photosynthesis were seen. The apparent quantum yield was decreased after fumigation. Stomatal conductance was generally decreased during fumigation, but transpiration was reduced relatively less than net photosynthesis indicating a lower water use efficiency of the trees exposed to ozone. Chlorophyll fluorescence (Fv/Fm) showed additive reductions in relation to ozone and light.
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Mikkelsen, T.N. Physiological responses of Fagus sylvatica L. exposed to low levels of ozone in open-top chambers. Trees 9, 355–361 (1995). https://doi.org/10.1007/BF00202500
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DOI: https://doi.org/10.1007/BF00202500