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 | 3:00 PM - 3:15 PM | THE EFFECT OF FLOODPLAIN CREATION ON SOIL PROCESSES IN AGRICULTURAL CHANNELS | 310 A
THE EFFECT OF FLOODPLAIN CREATION ON SOIL PROCESSES IN AGRICULTURAL CHANNELS
In the agricultural Midwest, subsurface drainage allows excess water to drain into agricultural channels, which flows into rivers and streams transporting excess nutrients downstream. The construction of an inset floodplain within agricultural channels enhances sedimentation of particulate nutrients and sediment, provides stable conditions for vegetation to establish, increases rates of microbial activity, and promotes denitrification. We collected sediments from floodplains of two-stage channels and naturally forming floodplain benches in conventional channels to determine the effect of floodplain creation on nutrient dynamics. We measured potential denitrification rates using bottle assays and net denitrification and respiration measurements via membrane inlet mass spectrometry (MIMS) seasonally. Respiration rates and organic matter fractions were higher in the inset floodplains for all seasons, but denitrification rates showed no difference. Nutrient processing rates were most dependent on local environmental conditions, particularly organic matter, background water chemistry, and sediment grain size. This suggests that site-specific conditions may dictate the impact of floodplain creation on water quality. However, because of the increase in biologically active surface area, the net effect on water quality is greater for the two-stage channels.
- Floodplain
- Biogeochemistry
- Nutrients
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Presenters/Authors
Celena Alford
(), Purdue University, alford5@purdue.edu;
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Sara McMillan
(), Purdue University, mcmill@purdue.edu;
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Alex Johnson
(), Purdue University, john1963@purdue.edu;
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Amanda Limiac
(), Purdue University, montgom8@purdue.edu;
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