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Risk assessments for forest trees : the performance of the ozone flux versus the AOT concepts

Abstract : Published ozone exposureeresponse relationships from experimental studies with young trees performed at different sites across Europe were re-analysed in order to test the performance of ozone exposure indices based on AOTX (Accumulated exposure Over a Threshold of X nmol mol_1) and AFstY (Accumulated Stomatal Flux above a threshold of Y nmol m_2 s_1). AFst1.6 was superior, as compared to AOT40, for explaining biomass reductions, when ozone sensitive species with differing leaf morphology were included in the analysis, while this was not the case for less sensitive species. A re-analysis of data with young black cherry trees, subject to different irrigation regimes, indicated that leaf visible injuries were more strongly related to the estimated stomatal ozone uptake, as compared to the ozone concentration in the air. Experimental data with different clones of silver birch indicated that leaf thickness was also an important factor influencing the development of ozone induced leaf visible injury.
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Conference papers
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https://hal.inrae.fr/hal-02832187
Contributor : Migration Prodinra <>
Submitted on : Sunday, June 7, 2020 - 6:54:04 AM
Last modification on : Thursday, November 5, 2020 - 9:01:05 AM

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  • HAL Id : hal-02832187, version 1
  • PRODINRA : 17124

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P.E. Karlsson, Stephane Braun, M. Broadmeadow, S. Elvira, Lisa Emberson, et al.. Risk assessments for forest trees : the performance of the ozone flux versus the AOT concepts. Critical Levels of Ozone: Further Applying and Developing the Flux-based Concept, Nov 2005, Obergurgl, Austria. pp.13-20. ⟨hal-02832187⟩

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