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Physiological responses ofFagus sylvaticaL. exposed to low levels of ozone in open-top chambers

✍ Scribed by T. N. Mikkelsen


Book ID
104661740
Publisher
Springer-Verlag
Year
1995
Tongue
English
Weight
656 KB
Volume
9
Category
Article
ISSN
0931-1890

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✦ Synopsis


Four-year-old beech seedlings were fumigated with three levels of ozone for 2 consecutive years in opentop 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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