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Effects of Ozone Exposure on Growth and Photosynthesis of Beech Seedlings (Fagus sylvatica)
Katrien Bortier, Reinhart Ceulemans and Ludwig de Temmerman
The New Phytologist
Vol. 146, No. 2 (May, 2000), pp. 271-280
Stable URL: http://www.jstor.org/stable/2588976
Page Count: 10
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The effects of ambient and elevated ozone levels on growth and photosynthesis of beech (Fagus sylvatica) were studied by exposing seedlings in open-top chambers for one growing season to three treatments: charcoal-filtered (CF), non-filtered (NF) and non-filtered air with addition of ozone (30 ppb ozone) on clear days for 8-10 h d-1(NF+). Ambient levels were relatively low and accumulated to an AOT40 (accumulated exposure over a threshold of 40 ppb) of 4055 ppb h (for the period 23 Apr-30 Sept). The NF+ chambers received an AOT40 of 8880 ppb h. Throughout the growing season we measured growth and photosynthetic properties. The treatments did not cause strong effects: measurements of gas exchange (light-saturated assimilation rate, CO2 and light-response curves) and chlorophyll fluorescence showed slight and mostly non-significant reductions of several parameters. No significant differences were found for growth, though in the NF+ treatment (AOT40 8880 ppb h) the relative growth rate for diameter increment was at times reduced by 12% compared with the control treatment.
The New Phytologist © 2000 New Phytologist Trust