Abstract
Abstract A numerical simulation model for the calculation of the transpiration of single trees has been developed. The required input data, like meteorological conditions as well as the flow configuration in and around the tree are provided by other, already existing models. Stem position and tree shape relate a certain leaf area to each grid volume of the three-dimensional model. This spatial heterogeneity allows the study of the radiation regime as well as the heat and water vapour exchange within the tree crown. Stomatal resistances are estimated in dependence of environmental factors. The individual leaf temperatures are calculated by solving an energy balance equation. Some model results, demonstrating the sensitivity of different input parameters on the transpiration rate, are presented.
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