2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
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
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Presenters/Authors
Shannon Speir
(), University of Notre Dame, sspeir@nd.edu;
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Jennifer L. Tank
(), University of Notre Dame, tank.1@nd.edu;
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Jason M. Taylor
(), USDA, Agricultural Research Service, National Sedimentation Lab, jason.taylor@ars.usda.gov;
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Amelia Grose
(), Michigan State University, groseame@msu.edu ;
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