2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2021 | 2:00 PM - 3:30 PM | NITROGEN DYNAMICS AND TRANSPORT ALONG FLOWPATHS IN A RURAL WETLAND-STREAM COMPLEX | Virtual Platform
NITROGEN DYNAMICS AND TRANSPORT ALONG FLOWPATHS IN A RURAL WETLAND-STREAM COMPLEX
Owing to their relatively small size, the chemical composition of low-order streams is vulnerable to abrupt change driven by groundwater discharge. We quantified the movement of water and the associated concentration of dissolved inorganic nitrogen (DIN) from surface and shallow groundwater environments in a wetland-stream complex. The wetland-stream complex is embedded within a rural-agriculture setting that includes infiltration beds that discharge treated municipal effluent (DIN: 17.18 mg/L) into the local aquifer. Our objectives were to (1) determine the role groundwater-surface water exchange has on the abundance of nitrogen in the stream and (2) determine the effect a wetland has on the abundance of nitrogen in the stream. Groundwater inputs increased the stream’s DIN concentration by an order of magnitude (0.02 – 0.22 mg/L) accompanied by diel swings in over 0.15 mg/L. While an adjacent fen reduced DIN concentrations in groundwater flowpaths converging on the stream by as much as 70%, its influence on stream nitrogen abundance was negligible due to low volumetric discharge of water reflecting the importance of topographic relief and substrate permeability.
- Hydroscapes
- Nutrients
- Transport
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Presenters/Authors
Colton Kyro
(), University of Montana, colton.kyro@umontana.edu;
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H. Maurice Valett
(), University of Montana, Division of Biological Sciences, maury.valett@umontana.edu;
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