No impact of tropospheric ozone on the gross primary productivity of a Belgian pine forest
Verryckt, Lore (University of Antwerp (Bèlgica))
Op de Beeck, Maarten (University of Antwerp (Bèlgica))
Neirynck, Johan (Instituut Natuur-en Bossonderzoek)
Gielen, Bert (University of Antwerp (Bèlgica))
Roland, Marilyn (University of Antwerp (Bèlgica))
Janssensd, Ivan A. (University of Antwerp (Bèlgica))

Data:	2017
Resum:	High stomatal ozone (O3) uptake has been shown to negatively affect crop yields and the growth of tree seedlings. However, little is known about the effect of O3 on the carbon uptake by mature forest trees. This study investigated the effect of high O3 events on gross primary productivity (GPP) for a Scots pine stand near Antwerp, Belgium over the period 1998-2013. Stomatal O3 fluxes were modelled using in situ O3 mixing ratio measurements and a multiplicative stomatal model, which was parameterised and validated for this Scots pine stand. Ozone-induced GPP reduction is most likely to occur during or shortly after days with high stomatal O3 uptake. Therefore, a GPP model within an artificial neural network was parameterised for days with low stomatal O3 uptake rates and used to simulate GPP during periods of high stomatal O3 uptake. Possible negative effects of high stomatal O3 uptake on GPP would then result in an overestimation of GPP by the model during or after high stomatal O3 uptake events. The O3 effects on GPP were linked to AOT40 and POD1. Although the critical levels for both indices were exceeded in every single year, no significant negative effects of O3 on GPP were found, and no correlations between GPP residuals and AOT40 and POD1 were found. Overall, we conclude that no O3 effects were detected on the carbon uptake by this Scots pine stand.
Ajuts:	European Commission 610028
Nota:	Imbalance-P paper. Contact with Lore Verryckt: Lore.Verryckt@uantwerpen.be
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Biogeosciences, Vol. 14, issue 7 (April 2017) , p. 1839-1855, ISSN 1726-4189

DOI: 10.5194/bg-14-1839-2017

17 p, 3.9 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
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