Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 1 2009 10.5194/bg-6-67-2009 http://www.biogeosciences.net/6/67/2009/ http://www.biogeosciences.net/6/67/2009/bg-6-67-2009.html http://www.biogeosciences.net/6/67/2009/bg-6-67-2009.pdf 67 84 2009-01-13 Modelling the dynamic chemical interactions of atmospheric ammonia with leaf surface wetness in a managed grassland canopy J. Burkhardt j.burkhardt@uni-bonn.de C. R. Flechard F. Gresens M. Mattsson P. A. C. Jongejan J. W. Erisman T. Weidinger R. Meszaros E. Nemitz M. A. Sutton Institute for Crop Science and Resource Conservation, INRES-PE, University of Bonn, Karlrobert-Kreiten-Str. 13, 53115 Bonn, Germany Soils, Agronomy and Spatialization Unit, UMR-SAS, INRA, 65, rue de St-Brieuc, 35042 Rennes, France Plant and Soil Science Laboratory, University of Copenhagen (UoC), Faculty of Life Sciences, Thorvaldsensvej 40, 1871 Frederiksberg C, Copenhagen, Denmark Energy Research Centre of the Netherlands (ECN), Postbus 1, 1755 ZG Petten, The Netherlands Department of Meteorology, Eötvös Loránd University (ELU), Pázmány Péter sétány 1/A, P.O. Box 32, 1518 Budapest, Hungary Centre for Ecology and Hydrology (CEH), Edinburgh Research Station, Bush Estate, Penicuik, Midlothian, EH26 0QB, UK Ammonia exchange fluxes between grassland and the atmosphere were modelled on the basis of stomatal compensation points and leaf surface chemistry, and compared with measured fluxes during the GRAMINAE intensive measurement campaign in spring 2000 near Braunschweig, Germany. Leaf wetness and dew chemistry in grassland were measured together with ammonia fluxes and apoplastic NH₄⁺ and H⁺ concentration, and the data were used to apply, validate and further develop an existing model of leaf surface chemistry and ammonia exchange. Foliar leaf wetness which is known to affect ammonia fluxes may be persistent after the end of rainfall, or sustained by recondensation of water vapour originating from the ground or leaf transpiration, so measured leaf wetness values were included in the model. pH and ammonium concentrations of dew samples collected from grass were compared to modelled values. <br><br> The measurement period was divided into three phases: a relatively wet phase followed by a dry phase in the first week before the grass was cut, and a second drier week after the cut. 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