2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | Increased temperature and carbon availability enhanced nitrous oxide production due to incomplete denitrification in river sediments | Virtual Platform
Increased temperature and carbon availability enhanced nitrous oxide production due to incomplete denitrification in river sediments
Streams and rivers are key sources of nitrous oxide, a powerful greenhouse gas, and incomplete denitrification results in nitrous oxide production, which is influenced by nitrate and organic carbon (C) availability, as well as water temperature. Moreover, few studies have experimentally isolated these drivers, especially in flowing waters. We used sediment core incubations conducted at 15C and 25C paired with membrane inlet mass spectrometry (MIMS) to understand how nitrate and C availability, as well as temperature influence nitrous oxide production rates and yields (as %) from sediment denitrification. In general, conditions that enhanced sediment denitrification rates also increased nitrous oxide production. At both temperatures, we observed higher nitrous oxide production with added C, and, at 25C, rates remained high across the nitrate gradient. Nitrous oxide yields were highest at 15C due to low total denitrification rates. Contrary to previous findings, C additions increased nitrous oxide yields at both low and high temperatures. Our results suggest that as global temperatures warm and rivers “brown,” enhancing C supply, nitrous oxide production from riverine sediments will likely increase.
- Nutrient cycling
- Biogeochemistry
- Stream
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Shannon Speir
(), University of Notre Dame, sspeir@nd.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Jennifer L. Tank
(), University of Notre Dame, tank.1@nd.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Jason M. Taylor
(), USDA, Agricultural Research Service, National Sedimentation Lab, jason.taylor@ars.usda.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Amelia Grose
(), Michigan State University, groseame@msu.edu ;
ASHA DISCLOSURE:
Financial -
Nonfinancial -