Northern Environment Predisposes Birches to Ozone Damage

E. Oksanen; S. Kontunen-Soppela; J. Riikonen; P. Peltonen; J. Uddling; E. Vapaavuori

doi:10.1055/s-2006-924176

Plant Biology, Inhaltsverzeichnis

Plant Biol (Stuttg) 2007; 9(2): 191-196
DOI: 10.1055/s-2006-924176

Review Article

Georg Thieme Verlag Stuttgart KG · New York

Northern Environment Predisposes Birches to Ozone Damage

E. Oksanen¹ , S. Kontunen-Soppela² , J. Riikonen² , P. Peltonen¹ , J. Uddling³ , E. Vapaavuori²

¹Department of Biology, University of Joensuu, P.O. Box 111, 80101 Joensuu, Finland
²Finnish Forest Research Institute, Suonenjoki Research Station, Juntintie 154, 77600 Suonenjoki, Finland
³Department of Plant and Environmental Sciences, Göteborg University, P.O. Box 461, 40530 Göteborg, Sweden

Abstract

Ozone sensitivity of silver birch (Betula pendula Roth) has been thoroughly investigated since early 1990′s in Finland. In our long-term open-field experiments the annual percentage reduction in basal diameter and stem volume increment were the best non-destructive growth indicators for ozone impact when plotted against AOTX. Remarkable differences in defence strategies, stomatal conductance, and defence compounds (phenolics), clearly indicate that external exposure indices are ineffective for accurate risk assessment for birch. For flux-based approaches, site-specific values for g _max and g _dark are necessary, and determinants for detoxification capacity, ageing of leaves, and cumulative ozone impact would be needed for further model development. Increasing CO₂ seems to counteract negative ozone responses in birch, whereas exposure to springtime frost may seriously exacerbate ozone damage in northern conditions. Therefore, we need to proceed towards incorporating the most important climate change factors in any attempts for ozone risk assessment.

Key words

Ozone - birch - open-field experiment - northern Europe - risk assessment - AOT40 - AfstY.

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Referenzen

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E. Oksanen

Department of Biology
University of Joensuu

P.O. Box 111

80101 Joensuu

Finland

eMail: elina.oksanen@joensuu.fi

Guest Editor: R. Matyssek