Updated stomatal flux and flux-effect models for wheat for quantifying effects of ozone on grain yield, grain mass and protein yield
2012
Grünhage, Ludger, L. | Pleijel, Hakan, H. | Mills, Gina, G. | Bender, Jürgen, J. | Danielsson, Helena, H. | Lehmann, Yvonne, Y. | Castell, Jean-François, J.-F. | Bethenod, Olivier, O. | Department of Plant Ecology ; Justus-Liebig-Universität Gießen = Justus Liebig University (JLU) | Department of Plant and Environmental Sciences ; Göteborgs Universitet = University of Gothenburg (GU) | Centre for Ecology and Hydrology [Bangor] (CEH) ; Natural Environment Research Council (NERC) | Institute of Biodiversity ; Johann Heinrich von Thünen-Institut = Thünen Institute | Environnement et Grandes Cultures (EGC) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Swedish Environment Protection Agency; Defra [AQ0810, AQ0816, AQ0601]; LRTAP Convention; NERC; French National Research Agency, ANR
Field measurements and open-top chamber experiments using nine current European winter wheat cultivars provided a data set that was used to revise and improve the parameterisation of a stomatal conductance model for wheat, including a revised value for maximum stomatal conductance and new functions for phenology and soil moisture. For the calculation of stomatal conductance for ozone a diffusivity ratio between O(3) and H(2)O in air of 0.663 was applied, based on a critical review of the literature. By applying the improved parameterisation for stomatal conductance, new flux-effect relationships for grain yield, grain mass and protein yield were developed for use in ozone risk assessments including effects on food security. An example of application of the flux model at the local scale in Germany shows that negative effects of ozone on wheat grain yield were likely each year and on protein yield in most years since the mid 1980s.
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