Evapotranspiration of beech stands as indicator for water supply and competition for water under different climate conditions

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This subproject within the Research Group consists of intimately connected experimental and simulation parts focussed on the evapotranspiration of beech stands and its components. In combination with the soil moisture in different depths, evapotranspiration is regarded as an indicator for water availability and competition for water. All basic variables to characterise weather and climate conditions at the primary research site Tuttlingen as well as the satellite sites Sisteron and Schönberg will be continuously measured and analysed. To investigate the response of evapotranspiration on local weather and climate conditions on the stand scale, turbulent fluxes of sensible and latent heat will be monitored by the EC method. Furthermore, partitioning of transpiration between canopy layer and understory vegetation as an indicator for competition for water will be addressed using branch bag systems. Parallel to the experimental studies, the water balance model BROOK90 will be implemented at each of the research sites to simulate the single terms of the water balance of the beech stands validated against measurements on the sites. BROOK90 represents an essential part of the process orientated biogeochemical model developed and tested within the research group.