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 has been calculated using the analogy with water vapour 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 average, it does not exceed the 34.4% of 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.
GEROSA Giacomo;
VITALE Marcello;
FINCO Angelo;
MANES Fausto;
BALLARIN DENTI Antonio;
CIESLIK Stanislaw;
2008-02-05
PERGAMON-ELSEVIER SCIENCE LTD
JRC33021
1352-2310,
https://publications.jrc.ec.europa.eu/repository/handle/JRC33021,
10.1016/j.atmosenv.2005.01.056,
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