EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2018 | 12:00 PM - 12:15 PM | HOMOGENIZATION OF DISSOLVED ORGANIC CARBON IN THE SEDIMENT-WATER INTERFACE OF STREAMS | 330 B
HOMOGENIZATION OF DISSOLVED ORGANIC CARBON IN THE SEDIMENT-WATER INTERFACE OF STREAMS
Dissolved organic carbon (DOC) is a large carbon pool in surface waters and is critical to nutrient cycling, food webs, and water quality conditions. DOC is characterized in terms of quantity (i.e., concentration) and quality (i.e., biochemical composition) measurements. The quality measurements of DOC change with respect to the DOC origin in the landscape. In streams, the sediment-water interface (SWI) is an ecotone containing metabolic activity rates exceeding other locations in the landscape. Many studies have investigated changes in DOC quantity through the SWI, but quality assessments are rare. Here, we hypothesize that the SWI will homogenize the DOC quality signals regardless of DOC origin. We test this hypothesis with laboratory batch reactor experiments and field push-pull tests in SWI sediments of a lowland, mixed land use stream using DOC leachates from four carbon sources - elm leaves, tamarack needles, flocculent organic matter, and acetate. We then characterized the DOC quantity and quality changes that occurred within SWI. Initial results show that multiple optically-based DOC qualities had consistent responses to SWI conditions, regardless of DOC source, supporting the hypothesis that the SWI functions as a DOC homogenization site in watersheds.
- Biogeochemistry
- Hydrology
- Hotspot
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Presenters/Authors
Joseph Lee-Cullin
(), Department of Earth and Environmental Sciences, Michigan State University, USA, cullinjo@msu.edu;
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Jay Zarnetske
(), Department of Earth and Environmental Sciences, Michigan State University, jpz@msu.edu;
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Rachel Geiger
(), College of the Environment, Western Washington University, WA, USA, geigerr@wwu.edu;
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Tyler Hampton
(), Department of Earth and Environmental Sciences, Michigan State University, USA, thampton@msu.edu;
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