Impact of Riparian and Stream Restoration on Denitrification in Geomorphic Features of Agricultural Streams

摘要: Highlights Denitrification enzyme activity (DEA) was measured in stream sediments of restored and unrestored agricultural streams. Nitrate, sediment characteristics, riparian vegetation, geomorphology influenced DEA. Pools at sites had lower organic carbon, coarser textures, denitrification potential. Restoration strategies should increase carbon residence times through complex flowpaths. Abstract. Agricultural land use, channel modifications, vegetation composition can affect instream by altering geomorphic features, such as texture, matter, retention time, hyporheic exchange. Stream restoration is widely implemented watersheds to mitigate excess nutrient export sensitive downstream waters; however, the cumulative impact reconstruction altered near-stream morphology on nitrogen dynamics remains poorly understood. We environmental variables (e.g., water chemistry, matter) different features agriculturally streams North Carolina with varied zone characteristics. Our results indicate that primarily increased transport nitrate (NO3-) wetter months. Secondarily, structural factors, including geomorphology, controlling distribution texture carbon. In newly stream, we observed streambed low especially scour pools constructed from cross-vanes. Lower DEA (39.1 ng N g-1 dry mass h-1) compared naturally occurring (70.7 278.1 h-1). These highlight need for be directed increasing flowpaths meanders, root wads, artificial woody debris dams).