EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2019 | 11:45 AM - 12:00 PM | DYNAMIC STREAM NETWORK INTERMITTENCE EXPLAINS EMERGENT DISSOLVED ORGANIC CARBON CHEMOSTASIS IN HEADWATERS | 151 G
DYNAMIC STREAM NETWORK INTERMITTENCE EXPLAINS EMERGENT DISSOLVED ORGANIC CARBON CHEMOSTASIS IN HEADWATERS
Dissolved organic carbon (DOC) concentrations are highly variable among headwaters, with variation typically decreasing with watershed area. To test our hypothesis that streamflow intermittence is an important source of variation in DOC, we sampled water chemistry across a 25.5-km2 watershed in southeastern Idaho during spring, summer, and fall. Across seasons, DOC variability collapsed at a consistent location (~1.5 km2), which coincided with the watershed area where variability in streamflow intermittence also collapsed. We developed temporal, spatial, and spatiotemporal metrics of streamflow intermittence and related these to DOC concentrations. Streamflow intermittence was a strong predictor of DOC across seasons, but different metrics predicted DOC depending on season. A metric that captured spatial connectivity to sources was a significant predictor of DOC during high flows, when DOC is typically controlled by transport. In contrast, a temporal metric that captured legacies of drying at a point was predictive of DOC during the late growing season, when DOC is typically controlled by instream processes. The effects of intermittence on DOC extend beyond temporal legacies at a point. Spatial patterns of intermittence upstream are critical for understanding spatial patterns of DOC, even in perennial reaches.
- Organic Matter
- Intermittency
- Watershed
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Presenters/Authors
Rebecca Hale
(), Idaho State University, halereb3@isu.edu;
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Sarah Godsey
(), Idaho State University, godsey@isu.edu;
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