Ozone uptake by an evergreen Mediterranean forest (Quercus ilex) in Italy. Part I: Micrometeorological flux measurements and flux partitioning

Giacomo Alessandro Gerosa, Angelo Finco, Antonio Angelo Ballarin Denti, Stanislaw Cieslik, Marcello Vitale, Fausto Manes

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)

Abstract

Ozone, water and energy fluxes have been measured over a Mediterranean evergreen forest in Central Italy from August to October 2003 with the eddy-correlation technique in order to evaluate the amount of ozone taken up by plants in dry summer and in mild autumn conditions. The stomatal ozone fluxes have been calculated using the analogy with water vapor fluxes inside the stomata, which are easily measurable. The total ozone dose was obtained by integrating the stomatal fluxes over time. Stomatal flux resulted a minor part (31.5%) of the total ozone flux over the forest ecosystem. The main part of ozone deposition follows non-stomatal pathways. Chemical sink seems to play a relevant role in the morning non-stomatal deposition. Stomatal uptake is enhanced by water availability but, on the average, it does not exceed the 34.4% of the total ozone flux. A comparison between the cumulated stomatal ozone fluxes and the currently used AOT40 exposure index highlighted important distortions introduced by this index. AOT40, which do not take into account plant physiology, lead to substantial overestimation of ozone risk, particularly when water supply is limited, as occurs frequently in Southern European and Mediterranean areas.
Original languageEnglish
Pages (from-to)3255-3266
Number of pages12
JournalAtmospheric Environment
Volume39
DOIs
Publication statusPublished - 2005

Keywords

  • Holm oak
  • Mediterranean forest ecosystem
  • Ozone deposition
  • stomatal uptake

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