Das Projekt "Integrated Nitrogen Model for European Catchments" wird vom Umweltbundesamt gefördert und von Universität Bayreuth, Bayreuther Institut für Terrestrische Ökosystemforschung, Lehrstuhl für Bodenökologie durchgeführt. Objective/Problems to be solved: Across the European Union there are concerns about nitrogen (N) in lowland and upland fresh water systems, estuaries and marine areas. In such systems, additional N inputs can cause rapid aquatic plant growth, leading to eutrophication. The problems of eutrophication are usually associated with lowland, intensively farmed areas where fertilisers provide a significant source of N and/or urban areas where domestic and industrial effluent is discharged to the receiving watercourse and groundwaters. However increasing N deposition from the atmosphere has lead to increased problems in upland regions. Whilst management strategies have been implemented to control N in river systems, these have tended to address single issues: either diffuse or point sources, or upland or lowland areas. However, the N concentrations and loads in rivers reflect the integration of the catchment N sources: fertiliser inputs, atmospheric deposition and sewage discharges. Superimposed on these anthropogenic inputs are contributions from the vegetation and mineralisation and nitrification of organic N in soils. Thus, given the holistic nature of the N problem, an integrated management approach is required. To support such an approach, modelling tools are needed to assess the likely impacts of land management, N deposition and climatic change on river N concentrations and loads. The INCA project has been designed to assess the impacts of multiple sources of N (N deposition, agricultural and sewage inputs) on water quality in European catchments. As such the project will directly contribute to EC policies including the Nitrate Directive (91/676/EEC) aimed at controlling diffuse nitrate pollution of public water supplies throughout Europe; the EC Habitats Directive (92/43/EEC) which aims to provide for the preservation of rare and valuable remnants of natural habitat in member states, including both terrestrial and aquatic habitat types; the Integrated Pollution Prevention and Control Directive (96/61/EEC) and the proposed Water Framework Directive (COM (97) 49 Final). Scientific objectives and approach: The INCA project is based on the INCA (Integrated Nitrogen in CAtchments) model, a processed based model of plant/soil system and instream N dynamics which has been developed and tested in 4 UK catchments. Based on mass balance and reaction kinetics, INCA accounts for the multiple sources of N and simulates the principle N mechanisms operating, including mineralisation, immobilisation, nitrification and denitrification. INCA will be applied to assess the impacts of catchment N inputs on water quality at the pan European spatial scale... Prime Contractor: University of Reading, Department of Geography; Reading,Silchester/United Kingdom.
