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Updated stomatal flux and flux-effect models for wheat for quantifying effects of ozone on grain yield, grain mass and protein yield

Journal article
Authors Ludger Grünhage
Håkan Pleijel
G. Mills
Jürgen Bender
Helena Danielsson
Yvonne Lehmann
Jean-Francois Castell
O. Bethenod
Published in Environmental Pollution
Volume 165
Pages 147-157
ISSN 0269-7491
Publication year 2012
Published at Department of Biological and Environmental Sciences
Pages 147-157
Language en
Links dx.doi.org/10.1016/j.envpol.2012.02...
Keywords Ozone; Diffusivity ratio; Stomatal flux; Flux-effect models; Wheat; Food security
Subject categories Environmental chemistry

Abstract

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 H2O 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. (C) 2012 Elsevier Ltd. All rights reserved.

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