Catchment-scale analysis reveals high cost-effectiveness of wetland buffer zones as a remedy to non-point nutrient pollution in north-eastern Poland

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  • Ewa Jabłońska, University of Warsaw
  • ,
  • Marta Wiśniewska, University of Warsaw
  • ,
  • Paweł Marcinkowski, Warsaw University of Life Sciences
  • ,
  • Mateusz Grygoruk, Warsaw University of Life Sciences
  • ,
  • Craig R. Walton, Leibniz-Institute of Freshwater Ecology and Inland Fisheries
  • ,
  • Dominik Zak
  • Carl C. Hoffmann
  • Søren E. Larsen
  • Michael Trepel, Christian-Albrechts-Universität zu Kiel
  • ,
  • Wiktor Kotowski, University of Warsaw

Large-scale re-establishment of wetland buffer zones (WBZ) along rivers is regarded as an effective measure in order to reduce non-point source nitrogen (N) and phosphorus (P) pollution in agricultural catchments. We estimated efficiency and costs of a hypothetical establishment of WBZs along all watercourses in an agricultural landscape of the lower Narew River catchment (north-eastern Poland, 16,444 km2, amounting to 5% of Poland) by upscaling results obtained in five sub-catchments (1087 km2). Two scenarios were analysed, with either rewetting selected wetland polygons that collect water from larger areas (polygonal WBZs) or reshaping and rewetting banks of rivers (linear WBZs), both considered in all ecologically suitable locations along rivers. Cost calculation included engineering works necessary in order to establish WBZs, costs of land purchase where relevant, and compensation costs of income forgone to farmers (needed only for polygonal WBZs). Polygonal WBZs were estimated in order to remove 11%-30% N and 14%-42% P load from the catchment, whereas linear WBZs were even higher with 33%-82% N and 41%-87% P. Upscaled costs of WBZ establishment for the study area were found to be 8.9 M EUR plus 26.4 M EUR per year (polygonal WBZ scenario) or 170.8 M EUR (linear WBZ scenario). The latter value compares to costs of building about 20 km of an express road. Implementation of buffer zones on a larger scale is thus a question of setting policy priorities rather than financial impossibility.

Original languageEnglish
Article number629
JournalWater (Switzerland)
Number of pages21
Publication statusPublished - Mar 2020

    Research areas

  • Cost calculation, Eutrophication, Hydrological modelling, Narew river, Wetland buffier zones

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