Nitrogen and Phosphorus Removal from Agricultural Runoff in Integrated Buffer Zones [component]

24 Integrated buffer zones (IBZs) represent a novel form of edge-of-field technology in Northwest 25 Europe. Contrary to the common riparian buffer strips, IBZs collect tile drainage water from 26 agricultural fields by combining a ditch-like pond (POND), where soil particles can settle, and a flow-27 through filter bed (FILTERBED) planted with Alnus glutinosa (L.), a European alder (black alder). The 28 first experimental IBZ facility was constructed and thoroughly tested in Denmark for its
more » ... Denmark for its capability to 29 retain various nitrogen (N) and phosphorus (P) species within the first three years after construction. 30 We calculated the water and nutrient budget for the total IBZ and for the two compartments, POND 31 and FILTERBED, separately. Furthermore, a tracer experiment using sodium bromide was conducted 32 in order to trace the water flow and estimate the hydraulic residence time in the FILTERBEDs. The 33 monthly average removal efficiency amounted to 10-67 % for total N and 31-69 % for total P, with 34 performance being highest during the warm season. Accordingly, we suggest that IBZs may be a 35 valuable modification of dry buffer strips in order to mitigate the adverse impacts of high nutrient 36 loading from agricultural fields on the aquatic environment. 37 38
doi:10.1021/acs.est.8b01036.s001 fatcat:ceh6lrsgznejbptbidisy2lp4i