2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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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;