2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | THE ASYNCHRONY OF PEAK NITRATE EXPORT AND WHOLE-STREAM METABOLISM: AN AGRICULTURAL MANAGEMENT CONUNDRUM? | Virtual Platform
THE ASYNCHRONY OF PEAK NITRATE EXPORT AND WHOLE-STREAM METABOLISM: AN AGRICULTURAL MANAGEMENT CONUNDRUM?
Nitrate export from artificially-drained agricultural watersheds deteriorates water quality and impairs ecosystem function. Stream processes, such as whole-stream metabolism (gross primary production and ecosystem respiration), provide regulating ecosystem services that can lower nitrate export. Yet the capacity of streams to significantly decrease nitrate loadings is inherently tied to land management practices and climate characteristics. In this study we used a high-frequency sampling approach (15 min – 1 h) to assess the timing and magnitude of nitrogen export and stream metabolic rates throughout a water year in a semi-arid, temperate, agricultural stream in the Inland Northwest USA. We hypothesized that peak watershed export and stream metabolism would occur asynchronously causing the latter to have a small relative influence on the annual nitrate loading. Our results show that most of the nitrate travels downstream during the winter and spring seasons when stream metabolism is at its lowest. These findings highlight the importance of land use and climate to contextualize stream ecosystem services. Implementing land management practices that reduce nitrate concentration before water reaches the stream is imperative to improve regional water quality.
- Ecosystem Dynamics
- Land use
- Nutrient cycling
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Presenters/Authors
Aline Ortega Pieck
(), University of Idaho, alineorteg@gmail.com;
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Erin Brooks
(), University of Idaho, ebrooks@uidaho.edu;
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Sarah Roley
(), Washington State University Tri Cities, sarah.roley@wsu.edu ;
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David Huggins
(), Washington State University, dhuggins@wsu.edu;
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