Dhr. Attila Nemes : Multi-scale hydraulic pedotransfer functions for Hungarian soils

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1 Apr 2003 13:30
Unit: Wageningen University
Promotor: prof.dr.ir. J. Bouma (Soil Inventarisation and Land Evaluation)
Co Promotor: dr. J.H.M. Wösten (Alterra), prof.dr.G. Várallyay (Research Institute for Soil Science and Agricultural Chemistry, Budapest, Hongarije

 For many soil water management related applications, estimation of soil hydraulic characteristics with pedotransfer functions (PTFs) may offer an alternative to measurements. New interpolation procedures were developed, evaluated and applied to achieve compatibility of soil particle-size distribution data that recognize different national or international standards, to enable the efficient use of different databases in deriving PTFs. The format, structure and operation of two novel soil hydraulic databases, the Hungarian HUNSODA and V2.0 of the international UNSODA, are described. Neural network PTFs provided better WRC estimates for Hungary using local data as input than using large international data sets. Functional evaluation of PTF estimates, however, showed small differences between PTFs derived from different scale databases and laboratory measurements. Those differences were not the main source of simulation errors. Three scenario studies were performed using PTF estimates. Using an exploratory research approach, it was demonstrated how PTFs might help improve land management planning.
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