Nitrogen Removal from Agricultural Subsurface Drainage by Surface-Flow Wetlands: Variability

• DOI: 10.3390/pr9010156
• Publication Date: 2021-01-15T17:44:05Z
• Authors: Lipe Renato Danta...
• Keywords: Tile drainage; Biogeochemical Cycle; Biogeochemistry; Subsurface Flow

Agriculture has long been considered a great source of nitrogen (N) to surface waters and major cause eutrophication. Thus, management practices at the farm-scale have since attempted mitigate N losses, although often limited in tile-drained agricultural catchments, which speed up transport, while minimizing natural removal landscape. In this context, surface-flow constructed wetlands (SFWs) particularly implemented as an edge-of-field strategy intercept tile drains reduce loads by re-establishing ecosystems services previously drained water ponded areas. These systems collect incoming volumes basins sufficiently large prolong hydraulic residence time degree where biogeochemical processes between water, soil, sediments, plants, macro microorganisms can mediate N. Despite their documented suitability, intra inter-variability treatment is still observed date. Therefore, it essential thoroughly investigate driving factors behind performance SFWs, order support successful implementation according local catchment characteristics, ensure compliance with goals. This review contextualizes aforementioned issue, critically evaluates influence hydrochemistry, hydrology biogeochemistry SFWs.