EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/05/2017 | 2:45 PM - 3:00 PM | HOW DOES INUNDATION AFFECT DENITRIFICATION IN AGRICULTURAL LANDSCAPES? | 301A
HOW DOES INUNDATION AFFECT DENITRIFICATION IN AGRICULTURAL LANDSCAPES?
Anthropogenic activities have greatly altered the nitrogen cycle, necessitating nitrogen management strategies in agricultural landscapes. Our research utilized field sampling, along with water level manipulation in an experimental stream and flow-through basin to determine how periodic inundation affects denitrification rates, microbial communities, and nitrous oxide pulses. DNA-based methods were used to quantify total bacteria and denitrifying gene abundances for each step in denitrification. At field sites, locations that periodically flooded had high potential for denitrification. In the experimental stream, short-term flood events led to physiological increases in denitrification, and in the flow-through basin, locations that periodically flooded had sustained increased denitrification rates without consequential increases in nitrous oxide yields. Results suggest that management strategies that promote water retention on the floodplain and that would periodically inundate floodplains would stimulate the formation of denitrification hot spots and hot moments, and that reconnecting agricultural channels with their floodplains would enhance nitrate uptake.
- C27 Landuse and Non-Point source Impacts
- C10 Biogeochemistry
- C28 Land-Water Interfaces
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Presenters/Authors
Abigail Tomasek
(), St. Anthony Falls Laboratory, Department of Civil Engineering, University of Minnesota, toma0074@umn.edu;
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Jessica Kozarek
(), St. Anthony Falls Laboratory, University of Minnesota, jkozarek@umn.edu;
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Miki Hondzo
(), St. Anthony Falls Laboratory, Department of Civil Engineering, University of Minnesota, mhondzo@umn.edu;
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Michael Sadowsky
(), BioTechnology Institute, University of Minnesota, sadowsky@umn.edu;
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