2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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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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