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 | 11:15 AM - 11:30 AM | SEASONAL PULSES OF DISSOLVED ORGANIC MATTER ARE DECOUPLED FROM ECOSYSTEM RESPIRATION IN A RESTORED TALLGRASS PRAIRIE STREAM | 151 ABC
SEASONAL PULSES OF DISSOLVED ORGANIC MATTER ARE DECOUPLED FROM ECOSYSTEM RESPIRATION IN A RESTORED TALLGRASS PRAIRIE STREAM
Prairie restoration can increase soil organic matter, but the effects of watershed-scale upland soil restoration on stream functions remain unclear. Here, we assessed dissolved organic matter (DOM) pools and fluxes to a headwater tallgrass prairie stream within a watershed influenced by long-term prairie restoration and no-till agriculture. We measured soil porewater and streamwater DOM monthly during the growing season and stream fluorescent DOM and dissolved oxygen continuously for one year; these data were used to model whole-stream metabolism. We predicted that DOM fluxes from soils to stream would be related to whole-stream metabolism, especially ecosystem respiration. DOM was 1.5x higher, on average in prairie vs. agriculture soil porewater; prairie soils exhibited highest DOM at the onset of autumn. Streamwater fluorescent DOM concentrations peaked during early spring. Highest GPP (2.1 g O2 m-2 d-1) and ER (-4.45 g O2 m-2 d-1) occurred in late spring, and was preceded by peak concentrations of DOM, suggesting seasonal stream metabolism was driven by primary production, rather than flushing of terrestrial dissolved organic matter. Our findings imply prairie restoration can affect soil organic matter pools, but changes to stream functions may be less pronounced.
- Metabolism
- Restoration
- Riparian
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Presenters/Authors
David Manning
(), University of Nebraska at Omaha, davidmanning@unomaha.edu;
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Ashlee Dere
(), University of Nebraska at Omaha, adere@unomaha.edu;
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Andrew Miller
(), University of Nebraska at Omaha, andrewmiller@unomaha.edu;
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Tracy Coleman
(), University of Nebraska at Omaha, tracycoleman@unomaha.edu;
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