2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2019  |   9:30 AM - 9:45 AM   |  NITROGEN AND CARBON DYNAMICS ALONG A WETLAND-STREAM SEQUENCE   |  250 AB

NITROGEN AND CARBON DYNAMICS ALONG A WETLAND-STREAM SEQUENCE

Studies of the stream continuum are often segregated from influential ponds, lakes, and wetland zones that function as discrete nutrient processing domains among linked aquatic ecosystems. We used a mass-balance approach along a 23-km wetland-stream sequence to determine potential controls on biogeochemical cycling in a tributary of the Upper Clark Fork River (UCFR), MT. Results identified discrete zones of nutrient production, transformation, and uptake along the sequence. Zones of production resulted in five- to seven-fold increases in nitrate loads. Nutrient dynamics were driven primarily by net groundwater exchange, which explained up to 30% (P = 0.0064) of the change in nitrate load. Processing of ammonium-rich groundwater inputs resulted in a mean nitrification rate of 250 mg m-2 day-1; on par with surface-flow constructed treatment wetlands. Abnormally high respiration rates (up to 172.27 g O2 m-2 day-1) calculated from changes in dissolved organic carbon load between ground- and surfacewater compartments suggest alternative removal pathways – i.e., adsorption to the carbonate precipitates which coat benthic and hyporheic substrates. During summer months, this sequence of aquatic systems nearly doubled the nitrate load of the UCFR while contributing only a 10% increase in discharge.

  • Landscape
  • Nutrients
  • Groundwater

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Presenters/Authors

Patrick Hurley (), University of Montana, patrick1.hurley@umontana.edu;


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H. Maurice Valett (), University of Montana, Division of Biological Sciences, maury.valett@umontana.edu;


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Marc Peipoch (), Stroud Water Research Center, mpeipoch@stroudcenter.org;


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