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- Title
Hydrologic and Biogeochemical Drivers of Riparian Denitrification in an Agricultural Watershed.
- Authors
McPhillips, Lauren; Groffman, Peter; Goodale, Christine; Walter, M.
- Abstract
This study investigated drivers of denitrification and overall NO removal in an agricultural riparian area in central New York. Denitrification was measured using an in situ 'push-pull' method with N-NO as a tracer during summer and fall 2011 at a pair of riparian sites characterized by different hydrologic regimes. Median denitrification rates were 1347 and 703 μg N kg soil day for the two study sites. These rates are higher than those reported for other riparian areas, emphasizing the role of some riparian areas as hotspots of NO removal. NO production was significantly higher at one site, demonstrating that riparian areas can be a greenhouse gas source under certain conditions. Denitrification was negatively correlated with groundwater flux, suggesting that slower flushing of water, and thus longer residence time, promotes denitrification. A mass balance of NO loss revealed that denitrification only accounted for 5-12 % of total NO loss, and production of NH indicated that dissimilatory NO reduction to NH (DNRA) may be occurring at both sites. While both sites were characterized by high NO removal, differences in denitrification rates and NO removal processes demonstrate the need to improve our ability to capture spatial and process heterogeneity in landscape biogeochemical models.
- Subjects
HYDROLOGIC cycle; BIOGEOCHEMICAL cycles; RIPARIAN areas; WETLANDS; DENITRIFICATION
- Publication
Water, Air & Soil Pollution, 2015, Vol 226, Issue 6, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-015-2434-2