Valuation of ecosystem services regarding the water framework directive on the example of the jahna river catchment in saxony (Germany)

Abstract

Using the example of the catchment area of the Jahna River in the loess region of Saxony (Germany) status and defi cit analyses were accomplished with regard to environmental objectives of the EU Water Framework Directive. Currently, there is no body of water in the study area in good ecological condition. In this intensively used agricultural area, the nutrients nitrogen and phosphorus as well as the acceptance and costs of measures against soil erosion and water pollution were determined as target variables. Signifi cant water pollution through nutrient leaching was identifi ed, and spatially differentiated risk and reduction potentials were demonstrated. The multi-criteria analysis in form of the utility value analysis was applied to support the objective decision process in the selection and prioritization of measures to reduce erosion and nutrient inputs to water. By equal weighting of the target variables the conservation tillage on the critical source areas and the cultivation of catch crops are representing the measures with the highest benefi t in the catchment area of the Jahna River. A benefi t-cost-ratio of 2 to 1 was estimated.