2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 12:15 PM - 12:30 PM | WHOLE RIVER ESTIMATES OF DENITRIFICATION IN RESPONSE TO A LARGE-SCALE NITROGEN ENRICHMENT OF THE KANSAS RIVER (USA) | 250 AB

WHOLE RIVER ESTIMATES OF DENITRIFICATION IN RESPONSE TO A LARGE-SCALE NITROGEN ENRICHMENT OF THE KANSAS RIVER (USA)

Rivers play a critical role in transporting nutrients to coastal waters; thus, understanding river N transport and transformation is of fundamental importance. We asked: Does whole river denitrification change in response to a four-month addition of high nitrogen and enriched microbial community? We used a release of water from a decommissioned fertilizer plant (the former Farmland site, in Lawrence, KS) and its resident microbial enrichment culture into the Kansas River to address our question. We measured whole river denitrification rates using the open-channel estimate of di-nitrogen gas production from samples collected hourly (for 24 hours) at a pair of sites, 1.6 km upstream and 5.5 km downstream of the release point. We conducted the sampling at the end of the four-month release of the high nitrogen water and two weeks post-release. We paired whole-river estimates of denitrification with real-time nitrate and dissolved oxygen sensors, which measured concentrations on 15-min increments. Quantifying whether the Kansas River transports novel microbial communities and how riverine N cycling changes in response to the additions will aid us in understanding the connection between microbial communities and biogeochemical cycling in aquatic ecosystems.

Nitrogen
Oxygen
Metabolism

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Presenters/Authors

Amy J. Burgin (), University of Kansas, burginam@ku.edu;