EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/26/2021 | 8:30 AM - 10:30 AM | Integrating perspectives on dissolved organic carbon removal and whole-stream metabolism | Virtual Platform
Integrating perspectives on dissolved organic carbon removal and whole-stream metabolism
Quantifying whole-stream dissolved organic carbon (DOC) metabolism is needed to better integrate inland waters into whole ecosystem carbon budgets. To understand how in-stream DOC metabolism affects DOC removal, export, and terrestrial loading fluxes, we compared DOC removal in two streams estimated using two common methods: (1) bioassays to measure water column DOC uptake velocity; and (2) daily rates of stream metabolism and OC spiraling (i.e., complete OC removal) calculated from fluorescent dissolved organic matter, oxygen, and water level sensor data. We compared how in-stream OC removal estimated from these two methods affected terrestrial OC loading and DOC export using a mass balance model. Mean OC mineralization velocity (0.07 ± 0.04 m/d (±SD)) was greater than mean bioassay DOC uptake velocity (0.01 ± 0.01 m/d). In model simulations, more DOC was removed when using OC mineralization velocity (0.5 to 17.0%) estimates compared to bioassay DOC uptake velocity (0.02 to 4.2%). We highlight how measurement uncertainty of in-stream DOC processing can have confounding effects when estimating terrestrial-aquatic DOC fluxes and removal. By integrating whole-stream metabolism with DOC transport, we can better quantify the role of running waters in the global carbon cycle.
- Ecosystem functioning
- Biogeochemistry
- Ecosystem
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Presenters/Authors
Stephen Plont
(), Virginia Tech, plontste@vt.edu;
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Jacob Riney
(), Virginia Tech, jaker98@vt.edu;
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Erin Hotchkiss
(), Virginia Tech, ehotchkiss@vt.edu;
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