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To what extent do molecular collisions arising from water vapour efflux impede stomatal O₃ influx?
2012
Uddling, Johan | Matyssek, Rainer | Pettersson, Jan B.C. | Wieser, Gerhard
Pre-requisite for reliable O₃ risk assessment for plants is determination of stomatal O₃ uptake. One unaddressed uncertainty in this context relates to transpiration-induced molecular collisions impeding stomatal O₃ influx. This study quantifies, through physical modelling, the error made when estimating stomatal O₃ flux without accounting for molecular collisions arising from transpiratory mass flow of gas out of the leaf. The analysis demonstrates that the error increases with increasing leaf-to-air water vapour mole fraction difference (Δw), being zero in water vapour saturated air and 4.2% overestimation at Δw of 0.05. Overestimation is approximately twice as large in empirical studies quantifying stomatal O₃ flux from measured leaf or canopy water flux, if neglecting both water vapour-dry air collisions (causing overestimation of leaf conductance) and collisions involving O₃. Correction for transpiration-induced molecular collisions is thus relevant for both empirical research and for large-scale modelling of stomatal O₃ flux across strong spatial Δw gradients.
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1995
Hirano, T. | Kiyota, M. | Aiga, I. (College of Agriculture, University of Osaka Prefecture, Sakai 593 (Japan))
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1998
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Effects of elevated O3 and CO2 on chlorophyll fluorescence and gas exchange in Scots pine during the third growing season
1997
Kellomaki, S. | Wang KaiYun (University of Joensuu, Faculty of Forestry, P.O. Box 111, FIN-80101 Joensuu (Finland))
Physiology, morphology, and ozone uptake of leaves of black cherry seedlings, saplings, and canopy trees
1995
Fredericksen, T.S. | Joyce, B.J. | Skelly, J.M. | Steiner, K.C. | Kolb, T.E. | Kouterick, K.B. | Savage, J.E. | Snyder, K.R. (Environmental Resources Research Institute, 220 Forest Resource Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802 (USA))
Physiological effects of ozone on cultivars of watermelon (Citrullus lanatus) and muskmelon (Cucumis melo) widely grown in Spain
1993
Fernandez-Bayon, J.M. | Barnes, J.D. | Ollerenshaw, J.H. | Davison, A.W. (Department of Agricultural and Environmental Science, Faculty of Agriculture and Biological Sciences, Ridley Building, University of Newcastle, Newcastle upon Tyne NE1 7RU (United Kingdom))
