EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/24/2018 | 2:45 PM - 3:00 PM | EFFECTS OF FLOODPLAIN RESTORATION ON NITROGEN AND PHOSPHORUS DYNAMICS IN AGRICULTURAL WATERSHEDS | 310 A
EFFECTS OF FLOODPLAIN RESTORATION ON NITROGEN AND PHOSPHORUS DYNAMICS IN AGRICULTURAL WATERSHEDS
Excess nitrogen and phosphorus in receiving waters is associated with high nutrient inputs in watersheds that are unsustainably and intensively managed for agriculture uses. The majority of export occurs during high flows that mobilize dissolved nutrients as well as sediment and associated pollutants. In undeveloped watersheds, floodplains intercept this flood pulse creating optimal conditions for physical and biological retention to occur. Anoxic conditions in saturated soils promote denitrification but can also release phosphorus from sorption sites that are maintained under oxic conditions. We are investigating nitrogen, phosphorus, and carbon dynamics in restored riverine floodplains using the Wabash River as a model system. Hydrodynamic modeling and daily flow frequency analysis shows that part of the floodplain is inundated 10% of the year and the entire floodplain is inundated 2% of the year on average. At the event scale, flood connectivity controls inputs and reducing conditions, which together influence nutrient dynamics. The spatial distribution of flooding is also reflected in structural (e.g. soil nutrient content) and functional (e.g. denitrification) patterns. Covariance between inundation, soil properties and denitrification suggests that connectivity plays a strong role in controlling the distribution of floodplain function.
- Biogeochemistry
- Denitrification
- Phosphorous
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Sara McMillan
(), Purdue University, mcmill@purdue.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Celena Alford
(), Purdue University, alford5@purdue.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Alex Johnson
(), Purdue University, john1963@purdue.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Siddharth Saksena
(), Purdue University, ssaksena@purdue.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Venkatesh Merwade
(), Purdue University, vmerwade@purdue.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Gregory Noe
(), U.S. Geological Survey, gnoe@usgs.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -