Hydrologic connectivity increases denitrification in the hyporheic zone and restored floodplains of an agricultural stream

摘要: [1] Stream ecotones, specifically the lateral floodplain and subsurface hyporheic zone, can be important sites for nitrogen (N) removal via denitrification, but their role in streams with constructed floodplains has not been examined. We studied denitrification zone of an agriculturally influenced headwater stream Indiana, USA, that had added as part a “two-stage ditch” restoration project. To examine potential N we seasonally measured rates nitrate concentrations by depth into sediments. found concentration declined was still measureable to at least 20 cm. also on restored over course flood (pre, during, post-inundation), compared between vegetated non-vegetated areas floodplain. increased inundation event, presence surface water when vegetation present. Stream ecotones midwestern, have substantial particularly they are hydrologically connected high-nitrate water.