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Microbial resistance and resilience to drought and rewetting modulate soil N 2 O emissions with different fertilizers.
- Source :
-
The Science of the total environment [Sci Total Environ] 2024 Mar 20; Vol. 917, pp. 170380. Date of Electronic Publication: 2024 Jan 26. - Publication Year :
- 2024
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Abstract
- Future climate models indicate an enhanced severity of regional drought and frequent rewetting events, which may cause cascading impacts on soil nitrogen cycle and nitrous oxide (N <subscript>2</subscript> O) emissions, but the underlying microbial mechanism remains largely unknown. Here we report an incubation study that examined the impacts of soil moisture status and nitrification inhibitor (DCD) on the N <subscript>2</subscript> O-producers and N <subscript>2</subscript> O-reducers following the application of urea and composted swine manure in an acid soil. The soil moisture treatments included 100 % water-holding capacity (WHC) (wetting, 35.3 % gravimetric soil water content), 40 % WHC (drought, 7 % gravimetric soil water content), and 40 % to 100 % WHC (rewetting). The results showed that N <subscript>2</subscript> O emissions were significantly decreased under drought conditions and were significantly increased after rewetting. The resistance of ammonia-oxidizing bacteria and nosZII, which was inhibited by urea or manure application, modulated N <subscript>2</subscript> O emissions under drought conditions. The resilience of the functional guilds modulated their dominant role in N <subscript>2</subscript> O emissions with rewetting. Ammonia-oxidizing bacteria, nirS-type denitrifying bacteria and nosZI showed significant resilience in response to rewetting. Significant negative relationships were observed between N <subscript>2</subscript> O emissions and nosZII clade under wetting condition and between N <subscript>2</subscript> O emissions and nosZI clade after rewetting. Our results highlighted the importance of microbial resistance and resilience in modulating N <subscript>2</subscript> O emissions, which help to better understand the dominant way of N <subscript>2</subscript> O emissions, and consequently make efficient mitigation strategies under the global climate change.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024. Published by Elsevier B.V.)
Details
- Language :
- English
- ISSN :
- 1879-1026
- Volume :
- 917
- Database :
- MEDLINE
- Journal :
- The Science of the total environment
- Publication Type :
- Academic Journal
- Accession number :
- 38281640
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2024.170380