EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/06/2017 | 11:30 AM - 11:45 AM | FACTORS INFLUENCING THE RELATIIVE CONTRIBUTION OF LARGE AND SMALL STREAMS TO WHOLE-NETWORK DENITRIRIFCAITON | 306A
FACTORS INFLUENCING THE RELATIIVE CONTRIBUTION OF LARGE AND SMALL STREAMS TO WHOLE-NETWORK DENITRIRIFCAITON
Variation in denitrification rates across stream networks is influenced by multiple factors including stream network chemistry, biology and hydrology. We use a stream network simulation model to isolate the effects of nitrate concentration and whole-stream respiration rate on denitrification from all other effects by varying hillslope concentration and stream respiration rates while holding all other variables constant. Our model estimates denitrification based on empirical relationships among denitrification uptake velocity, stream nitrate concentration, and stream respiration rate, with respiration rates related to stream temperature via an Arrhenius-type relationship. Simulation results reveal the effects of hillslope nitrate concentration and stream respiration rate on geospatial patterns of total and fractional denitrification uptake. In stream networks which remove a large portion of incoming nitrate, we demonstrate that the depletion of nitrate concentration across the network results in higher denitrification rates in small streams than in large streams. Alternatively, in stream networks with proportionally small nitrate removal, we demonstrate that elevated respiration rates in larger, warmer streams lead to higher denitrification rates.
- C14 Hydroecology
- C24 Eutrophication
- C10 Biogeochemistry
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Presenters/Authors
Sam Carlson
(), Montana State University, sam.p.carlson@gmail.com;
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Geoffrey Poole
(), Montana State University, Montana Institute on Ecosystems, gpoole@montana.edu ;
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Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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Ellen Wohl
(), Colorado State University, ellenw@warnercnr.colostate.edu ;
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David Walters
(), US Geological Survey, waltersd@usgs.gov;
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Michael Venarsky
(), Australian Rivers Institute, Griffith University, mvenarsky@gmail.com;
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