2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 11:15 AM - 11:30 AM | N PROCESSING PATTERNS THROUGH TIME AND SPACE: LINKING DIEL N DYNAMICS, UPTAKE, AND METABOLISM IN A LARGE RIVER | 330 B
N PROCESSING PATTERNS THROUGH TIME AND SPACE: LINKING DIEL N DYNAMICS, UPTAKE, AND METABOLISM IN A LARGE RIVER
Nitrogen (N) cycling in riverine systems, as compared to headwater streams, remains understudied, especially during winter and early spring seasons. To better understand wintertime riverine N cycling dynamics, we treated a six-month controlled nitrogenous fertilizer waste release into the Kansas River (conducted by the City of Lawrence, KS) as an ecosystem-scale nutrient addition experiment. Four in-situ nitrate sensors, paired with dissolved oxygen and photosynthetically active radiation sensors, were deployed across 32 km of the river from January to May 2018. Water column nitrate concentration followed a sinusoidal diel pattern both pre (0.50 – 0.70 mg-N/L, 28 November 2017) and post-addition (0.72 – 0.95 mg-N/L, 28 January 2018), suggesting that N cycling microbiota increased processing rates in response to N enrichment. We will examine the periodicity of these diel patterns, and how they change throughout the winter and into the spring months. We will also compare river metabolism, both upstream and downstream of the release point, to understand the effect of the N addition on overall riverine metabolism. This unique pairing of an ecosystem-scale N addition with high-frequency sensor data will increase our understanding of how a large river cycles N.
- Denitrification
- Nitrogen
- Stochasticity
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Presenters/Authors
Michelle Catherine Kelly
(), University of Kansas, michellekelly@ku.edu;
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Amy J. Burgin
(), University of Kansas, burginam@ku.edu;
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