Potential von Maßnahmen zur Reduktion der Nährstoffflüsse im Einzugsgebiet der Oder
With its location between the Baltic Sea and the river Oder the Szczecin Lagoon is heavily influenced from both sites. Next to direct atmospheric deposition on the water surface area of the lagoon the river Oder is the most important source for nutrient emissions. For the implementation of the EC Water Framework Directive a considerable reduction of nutrient emissions to the Oder and loads to the Lagoon have to be achieved. This study considers several management options with a great potential for the reduction of emissions, although, especially for nitrogen, it seems unlikely to meet the reduction goals until 2015. By the implementation of the Waste water Ordinance (AbwV) emissions can be reduced significantly. As in the Oder catchment the nitrogen surplus on agricultural land is in most cases lower then requested from the Fertilizer Ordinance, its implementation will only have very limited effect on the nutrient emissions. The development of nitrogen surplus has shown an increasing trend for the last years, which suggests gaining importance for future emissions from this source. The European Monitoring and Evaluation Programme EMEP (Co-operative Programme for Monitoring and Evaluation of the Long-Range Transmission of Air Pollutants in Europe) proposed a reduction of atmospheric deposition until 2015, which would have a positive effect for both direct depositions on the water surface area of the lagoon and the emissions from the Oder catchment. Management options to reduce emissions via urban systems, erosion and tile drainages should be implemented in hot spot areas and can in total contribute to a relevant reduction of the total emissions from the catchment. Hot spot areas have been identified by the impact ratio. For setting up management plans, however, a further consideration of the spatial distribution of monthly nutrient emissions is suggested.
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