2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | NUTRIENT PROCESSING DOMAINS: NET MATERIAL BALANCE, EXCHANGE POTENTIAL, AND AVAILABILITY EFFECT | Virtual Platform
NUTRIENT PROCESSING DOMAINS: NET MATERIAL BALANCE, EXCHANGE POTENTIAL, AND AVAILABILITY EFFECT
A Nutrient Processing Domain (NPD) is a realm in functional space occupied by stream reaches that share similar biogeochemical character and distinguishes how hydrologic exchange and in-stream processes combine to impart biogeochemical character. Location within functional space (“reach character”) is determined empirically using changes in discharge, material transport, and concentration that occur within the reach. We applied this approach to 11 years of bi-weekly water concentration of nitrogen (N) and phosphorus (P) from the Upper Clark Fork River, MT, to address how net material balance, exchange potential, and availability differed seasonally among three reaches. Effective solute fluxes for nitrate-N calculated via mass-balance revealed that reaches ranged from net sources (194.7 mg N/m2/d) to sinks (-60.0 mg NO3-N/m2/d) while simultaneously acting as soluble reactive P sinks (-3.6 mg P/m2/d) and sources (16.0 mg P/m2/d). Solute fluxes for Total N and Total P were closely linked to changes in hydraulic load while those for nitrate and SRP were less so. The NPD approach simultaneously assesses key features entailed in material balance and provides a conceptual framework for considering the distribution, interactions, and implications of river reaches in distinct realms of biogeochemical behavior.
- Ecosystem functioning
- Nutrient cycling
- Flow regime
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Presenters/Authors
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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Geoffrey C Poole
(), Montana State University, gpoole@montana.edu;
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