2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 2:30 PM - 2:45 PM | EFFECTS OF EXTENDED DROUGHT AND SUBSEQUENT FLOODING ON NUTRIENT DYNAMICS IN PRAIRE STREAMS | 254 B
EFFECTS OF EXTENDED DROUGHT AND SUBSEQUENT FLOODING ON NUTRIENT DYNAMICS IN PRAIRE STREAMS
Drought and flooding represent the dominant drivers of disturbance in intermittent streams. Effects of these drivers will be important to understand in the Great Plains, where drought risk and severity are expected to increase with climate change. Increases in drought severity may lead to longer dry periods in intermittent streams and intermittent conditions in streams that have historically been perennial. We used long-term water chemistry and discharge data measured on Konza Prairie Biological Station, Kansas, USA to examine effects of drought and rewetting on nutrient (C, N, and P) concentrations and export in prairie streams ranging from second- to fifth-order. There is a strong relationship between stream discharge and nutrient export, but the number of dry days preceding each flow event has small effect on nutrients compared to the magnitude of flow after drought. However, the effect of extended drought on nutrient export becomes greater in low-order drainages. These results suggest increased drought will affect nutrient export by headwater streams more than nutrient export by larger-order streams. This is likely due to more terrestrial influence in headwaters, and less processing time of terrestrial inputs in freshwater environments.
- Watershed
- Intermittency
- Disturbance
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Presenters/Authors
James Guinnip
(), Kansas State University, jguinnip@ksu.edu;
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Walter Dodds
(), Kansas State University, wkdodds@ksu.edu;
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