Summary
Clonal stock (grafts of 15-, 50-, and 100-year-old trees) of spruce (Picea abies (L.) Karst.) and fir (Abies alba Mill.) was exposed either to 150 ppb ozone (∼300 μgm-3) during 9 daylight hours or to carbon-filtered air on 35 days between 29 August and 21 October 1983. At the end of the fumigation the trees did not exhibit any visible signs of injury. Transpiration and leaf conductance in light and darkness, measured with a Licor porometer, revealed, however, stomatal sluggishness and — in spruce-increased transpiration.
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Keller, T., Häsler, R. The influence of a fall fumigation with ozone on the stomatal behavior of spruce and fir. Oecologia 64, 284–286 (1984). https://doi.org/10.1007/BF00376884
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DOI: https://doi.org/10.1007/BF00376884