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Water, Air, and Soil Pollution

, Volume 85, Issue 3, pp 1343–1348 | Cite as

Growth of field-grown ash trees (Fraxinus excelsior) exposed to ozone episodes

  • J. J. Colls
  • J. J. J. Wiltshire
  • C. J. Wright
  • M. H. Unsworth
Part III Direct Effects of Air Pollutants on Vegetation

Abstract

Ash trees were exposed to ozone episodes (150 nl l−1, 8 h d−1, 24–27 d y−1) from May to October, 1992 to 1994, in open-top chambers designed to minimise microclimatic modification. Many aspects of growth were studied, including leaf abscission, leaf area, mean leaf size, tree height and girth, extension growth, cross sectional area of annual rings and above-ground dry weight. An overview of the results is presented. This shows that the duration of the leaf fall period was increased by exposure to ozone. However, three seasons of severe ozone exposure relative to UK conditions did not significantly alter other aspects of growth.

Key words

ozone episodes Fraxinus excelsior growth leaf area abscission open-top chambers 

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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • J. J. Colls
    • 1
  • J. J. J. Wiltshire
    • 2
  • C. J. Wright
    • 1
  • M. H. Unsworth
    • 3
  1. 1.Faculty of Agricultural and Food SciencesUniversity of NottinghamLoughboroughUK
  2. 2.ADAS Terrington, Terrington St ClementKing's LynnUK
  3. 3.Center for Analysis of Environmental ChangeOregon State UniversityCorvallisUSA

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