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Direct biological fixation provides a freshwater sink for N2O
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Si, Yueyue, Zhu, Yizhu, Sanders, Ian, Kinkel, Dorothee B., Purdy, Kevin J. and Trimmer, Mark (2023) Direct biological fixation provides a freshwater sink for N2O. Nature Communications, 14 (1). 6775. doi:10.1038/s41467-023-42481-2 ISSN 2041-1723.
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Official URL: http://dx.doi.org/10.1038/s41467-023-42481-2
Abstract
Nitrous oxide (N2O) is a potent climate gas, with its strong warming potential and ozone-depleting properties both focusing research on N2O sources. Although a sink for N2O through biological fixation has been observed in the Pacific, the regulation of N2O-fixation compared to canonical N2-fixation is unknown. Here we show that both N2O and N2 can be fixed by freshwater communities but with distinct seasonalities and temperature dependencies. N2O fixation appears less sensitive to temperature than N2 fixation, driving a strong sink for N2O in colder months. Moreover, by quantifying both N2O and N2 fixation we show that, rather than N2O being first reduced to N2 through denitrification, N2O fixation is direct and could explain the widely reported N2O sinks in natural waters. Analysis of the nitrogenase (nifH) community suggests that while only a subset is potentially capable of fixing N2O they maintain a strong, freshwater sink for N2O that could be eroded by warming.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics T Technology > TD Environmental technology. Sanitary engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||
Library of Congress Subject Headings (LCSH): | Nitrous oxide -- Environmental aspects, Greenhouse gas mitigation, Climatic changes -- Environmental aspects, Atmospheric nitrous oxide -- Environmental aspects, Water-supply -- Environmental aspects | ||||||
Journal or Publication Title: | Nature Communications | ||||||
Publisher: | Nature Publishing Group | ||||||
ISSN: | 2041-1723 | ||||||
Official Date: | 25 October 2023 | ||||||
Dates: |
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Volume: | 14 | ||||||
Number: | 1 | ||||||
Article Number: | 6775 | ||||||
DOI: | 10.1038/s41467-023-42481-2 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 6 November 2023 | ||||||
Date of first compliant Open Access: | 7 November 2023 | ||||||
RIOXX Funder/Project Grant: |
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