2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2018 | 9:15 AM - 9:30 AM | EXPLORING SPATIOTEMPORAL VARIATION IN STREAM DISSOLVED ORGANIC MATTER TO BETTER UNDERSTAND HYDROECOLOGICAL REGIMES IN A MONTANE, URBANIZING WATERSHED | 321
EXPLORING SPATIOTEMPORAL VARIATION IN STREAM DISSOLVED ORGANIC MATTER TO BETTER UNDERSTAND HYDROECOLOGICAL REGIMES IN A MONTANE, URBANIZING WATERSHED
Headwater streams integrate chemical outputs of adjacent terrestrial ecosystems, and high-elevation watersheds are sensitive to climate and land-use influences. Dissolved organic matter (DOM) composition in stream water reflects an aggregation of biogeochemical flux; thus, variations in its character may inform understanding of stream spatiotemporal processing patterns. We explored the potential for signals in DOM fluorescence and molecular composition to represent hydroecological processing regimes in montane headwater streams over hourly, seasonal, and inter-annual resolutions. We expected the contribution of locally derived DOM during the algal growing season (summer through autumn) would be controlled largely by stream biomass production, which is influenced by initial scouring snowmelt flow, time of day, and nutrient loading. Terrestrial DOM signatures were observed continuously, describing a dominant hydrologic connection throughout watershed compartments. DOM composition and reactivity fluctuated spatially and within diel cycles; this variation was not apparent using an overall PARAFAC fluorescent model approach, therefore supplementary comparative models were considered. Variation in DOM composition appeared to be a function of local processes and nighttime biogeochemical processing. This work contributes a useful approach toward using spatiotemporal variation in DOM composition to infer the hydroecological regimes of watershed ecosystems.
- Biogeochemistry
- Ecosystem
- Aquatic-terrestrial Linkage
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Presenters/Authors
Juliana D'Andrilli
(), Montana State University, juliana@montana.edu;
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Meryl Storb
(), Montana State University, meryl.storb@gmail.com;
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Robert Payn
(), Montana State University, Montana Institute on Ecosystems, rpayn@montana.edu;
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