2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2018 | 10:00 AM - 10:15 AM | ARE BIOGEOCHEMICAL RESPONSES LINKED TO THE MICROBIAL COMPOSITION OF A DEFINED NUTRIENT AND MICROBIAL INPUT TO A LARGER RIVER? | 330 B

ARE BIOGEOCHEMICAL RESPONSES LINKED TO THE MICROBIAL COMPOSITION OF A DEFINED NUTRIENT AND MICROBIAL INPUT TO A LARGER RIVER?

Rivers play a critical role in transporting nutrients to coastal waters; thus, understanding river N transport and transformation is of fundamental importance. Nitrate concentration, land use, hydrology, and seasons all affect rates of denitrification (nitrate to di-nitrogen gas) and nitrification (ammonium to nitrate). The linkages between riverine microbial community composition (MCC) and N cycling rates, however, are often unclear. Large ecosystem-scale additions of both N and a novel N-enriched microbial community may assist in understanding the role of MCC in altering N cycling rates. We ask: Does N processing respond solely to changes in N substrate supply, or does changing the MCC also affect ecosystem-scale biogeochemistry? We use a release of remarkably high-N water (from a decommissioned fertilizer plant) and its resident microbial enrichment culture into the Kansas River to address our question. We measured rates of denitrification potentials (DEAs), nitrification rates and MCC upstream of the release site, and across a 32-km downstream reach. 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 MCC and biogeochemical cycling in aquatic ecosystems.

Pulse
Biogeochemistry
Denitrification

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Presenters/Authors

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