Ozone (O3) induces deleterious effects on plants by its oxidising capacity. Efforts have aimed at defining O3 critical loads which are based on O3 penetrating into the plant through the stomata, being an important mechanism of O3 removal. Recently, papers have proposed the use of process-based models for estimating the O3 dose at the community level. These models should define the stomatal O3 flux (Fst) on vegetation, correlating it to O3-induced injury and hence to improve the data-base available for decision makers. A process-based model has been utilised for the quantification of O3 flux (F) toward a Holm oak forest and its repartition in Fst and non-stomatal flux (Fnost) during daylight. The model outputs have been compared with eddy covariance measurements. Simulation of O3 fluxes under the climatic limitations of summer 2003 showed that the mean values of Fst represented only 28.9% of F, which was similar to eddy covariance (31.5%). The use of LAIeffective to link the leaf Fst to the canopy scale O3 stomatal flux (Feffectjve; on ground unit) is shown to be useful not only for the model validation but also for upscaling purposes from leaf to canopy. Forest acts as a LAI=1, i.e. a “real” big leaf for canopy O3 uptake. Changes in O3 fluxes were more closely related to the factors that control O3 deposition than to the factors controlling O3 concentration. Simulations showed that Holm oak forest was most effective at taking up O3 under moderate to high irradiance and high physiological activity, but not in limiting environmental conditions. The model used here does not require a great number of input variables and it is based on simple assumptions with respect to other more recognised models. So, the use of this model can have useful applications for the risk assessment of level II for the forests.

Ozone uptake by an evergreen mediterranean forest (Quercus ilex L.) in Italy - Part II: flux modelling. Upscaling leaf to canopy ozone uptake by a process-based model / Vitale, Marcello; G., Gerosa; A., Ballarin Denti; Manes, Fausto. - In: ATMOSPHERIC ENVIRONMENT. - ISSN 1352-2310. - STAMPA. - 39:18(2005), pp. 3267-3278. [10.1016/j.atmosenv.2005.01.057]

Ozone uptake by an evergreen mediterranean forest (Quercus ilex L.) in Italy - Part II: flux modelling. Upscaling leaf to canopy ozone uptake by a process-based model

VITALE, MARCELLO;MANES, Fausto
2005

Abstract

Ozone (O3) induces deleterious effects on plants by its oxidising capacity. Efforts have aimed at defining O3 critical loads which are based on O3 penetrating into the plant through the stomata, being an important mechanism of O3 removal. Recently, papers have proposed the use of process-based models for estimating the O3 dose at the community level. These models should define the stomatal O3 flux (Fst) on vegetation, correlating it to O3-induced injury and hence to improve the data-base available for decision makers. A process-based model has been utilised for the quantification of O3 flux (F) toward a Holm oak forest and its repartition in Fst and non-stomatal flux (Fnost) during daylight. The model outputs have been compared with eddy covariance measurements. Simulation of O3 fluxes under the climatic limitations of summer 2003 showed that the mean values of Fst represented only 28.9% of F, which was similar to eddy covariance (31.5%). The use of LAIeffective to link the leaf Fst to the canopy scale O3 stomatal flux (Feffectjve; on ground unit) is shown to be useful not only for the model validation but also for upscaling purposes from leaf to canopy. Forest acts as a LAI=1, i.e. a “real” big leaf for canopy O3 uptake. Changes in O3 fluxes were more closely related to the factors that control O3 deposition than to the factors controlling O3 concentration. Simulations showed that Holm oak forest was most effective at taking up O3 under moderate to high irradiance and high physiological activity, but not in limiting environmental conditions. The model used here does not require a great number of input variables and it is based on simple assumptions with respect to other more recognised models. So, the use of this model can have useful applications for the risk assessment of level II for the forests.
2005
critical loads; holm oak forest; modelling; leaf area index; gas exchange
01 Pubblicazione su rivista::01a Articolo in rivista
Ozone uptake by an evergreen mediterranean forest (Quercus ilex L.) in Italy - Part II: flux modelling. Upscaling leaf to canopy ozone uptake by a process-based model / Vitale, Marcello; G., Gerosa; A., Ballarin Denti; Manes, Fausto. - In: ATMOSPHERIC ENVIRONMENT. - ISSN 1352-2310. - STAMPA. - 39:18(2005), pp. 3267-3278. [10.1016/j.atmosenv.2005.01.057]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/239439
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