2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 2:30 PM - 2:45 PM | DISSOLVED INORGANIC NITROGEN EXPORTS DURING FLOODS FROM AN INTERMITTENT DESERT STREAM | 310 B
DISSOLVED INORGANIC NITROGEN EXPORTS DURING FLOODS FROM AN INTERMITTENT DESERT STREAM
Nitrogen export from streams is an environmental and public health concern. Temporary streams export the majority of nitrogen loads during floods, but there is high variability between events. We investigated the balance of nitrogen retention versus export during floods in an intermittent desert stream watershed. From 2010-2016, we collected floodwater samples for analysis of nitrate and ammonium from Sycamore Creek, located northeast of Phoenix, Arizona. We calculated nitrogen export by multiplying the mean floodwater concentration by total water load from each event. Export (as N) ranged from 2 to 3066 for nitrate and from 0.02 to19 kg for ammonium, and was primarily driven by the amount of discharge during the flood. Ammonium export increased significantly with a longer time interval since the previous flood. Mean nitrate and ammonium concentrations in flood water were significantly lower with higher prior season precipitation and current season cumulative precipitation prior to the event date, but were not related to time interval since prior flood. These results may indicate biological control of floodwater nitrate and ammonium concentrations, with higher precipitation increasing nutrient processing and uptake by the biological community, preventing accumulation of potentially mobile nitrogen.
- Flood
- Intermittent
- Watershed
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Presenters/Authors
Amalia Handler
(), Arizona State University, amhandle@asu.edu;
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Nancy Grimm
(), Arizona State University, nbgrimm@asu.edu;
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