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Soil water balance and flux modelling in forest ecosystems and validation with field data (Level II plots)

Forest Focus application, November 2004. Soil water balance and flux modelling in forest ecosystems and validation with field data (Level II plots). E. Graf Pannatier, M. Starr, N. Clarke, U. Vilhar, H. Meesenburg, P. Michopoulos. List of participants.

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Soil water balance and flux modelling in forest ecosystems and validation with field data (Level II plots)

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  1. Forest Focus application, November 2004 Soil water balance and flux modelling in forest ecosystems and validation with field data(Level II plots) E. Graf Pannatier, M. Starr, N. Clarke, U. Vilhar, H. Meesenburg, P. Michopoulos

  2. List of participants • Finland (lead applicant): Michael Starr, John Derome, Antti-Jussi-Lindroos. • Greece: P. Michopoulos, G. Baloutsos, A. Economou. • Germany: Henning Meesenburg,Karl Josef Meiwes, Andreas Schulze. • Slovenia: Ursa Vilhar, Mihej Urbančič, Igor Smolej, Primoz Simoncic. • Subcontractors in non-EU countries: • Switzerland: Elisabeth Graf Pannatier, Peter Waldner, Manfred Stähli, Norbert Kräuchi, Peter Blaser. • Norway: Nicholas Clarke

  3. Why soil water balances are important? • To calculate mass balance budget and leaching fluxes of nutrients and DOC • To calculate critical loads and to model the impact of deposition on forest soil (dynamic modelling) • To estimate drought stress (PET/AET) and forest fire risks • To simulate climate change scenarios

  4. Water balance at Level II monitoring sites • Estimate of water balance with models • Many countries have difficulties in: • choosing a model adapted for the site • gathering all input data. Some models are data demanding • validating the results of the models. Soil data are scarce. Use of pedotransfer functions often determined in other soil types. • FIMCI estimated hydrological fluxes for 245 Level II sites (de Vries et al., 2001). • Results: the leaching fluxes are plausible but could be validated at 2 sites only (D+NL) Average leaching fluxes (mm.yr--1) for 245 monitoring plots (de Vries et al. 2001)

  5. Objectives • To simulate soil moisture regimes and water fluxes through the forest ecosystems in selected Level II monitoring sites with simple and more complex hydrological models (e.g. WATBAL, SWATRE, Coup model) • To validate the results of the models with field data (soil moisture, percolation fluxes) • To determine the loss of information by using a simple model rather than a complex one • To make recommendations for the choice of a hydrological model according to the level of information available • To provide a set of recommended values for parameters that are not available (for various models)

  6. To be discussed Choice of: • study sites (Level II plots) • water balance models • parameters for the validation of model results • additional measurements of soil physical characteristics (soil moisture, soil water characteristic curve, unsaturated hydraulic conductivity)

  7. Work plan

  8. Financial plan • Total financial plan for Project:

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