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Biochar amendment suppresses N 2 O emissions but has no impact on 15 N site preference in an anaerobic soil
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Hyodo, Ayumi, Malghani, Saadatullah, Zhou, Yong, Mushinski, Ryan , Toyoda, Sakae, Yoshida, Naohiro, Boutton, Thomas W. and West, Jason B. (2019) Biochar amendment suppresses N 2 O emissions but has no impact on 15 N site preference in an anaerobic soil. Rapid Communications in Mass Spectrometry, 33 (2). pp. 165-175. doi:10.1002/rcm.8305 ISSN 0951-4198.
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Official URL: http://dx.doi.org/10.1002/rcm.8305
Abstract
Rationale
Biochar amendments often decrease N2O gas production from soil, but the mechanisms and magnitudes are still not well characterized since N2O can be produced via several different microbial pathways. We evaluated the influence of biochar amendment on N2O emissions and N2O isotopic composition, including 15N site preference (SP) under anaerobic conditions.
Methods
An agricultural soil was incubated with differing levels of biochar. Incubations were conducted under anaerobic conditions for 10 days with and without acetylene, which inhibits N2O reduction to N2. The N2O concentrations were measured every 2 days, the SPs were determined after 5 days of incubation, and the inorganic nitrogen concentrations were measured after the incubation.
Results
The SP values with acetylene were consistent with N2O production by bacterial denitrification and those without acetylene were consistent with bacterial denitrification that included N2O reduction to N2. There was no effect of biochar on N2O production in the presence of acetylene between day 3 and day 10. However, in the absence of acetylene, soils incubated with 4% biochar produced less N2O than soils with no biochar addition. Different amounts of biochar amendment did not change the SP values.
Conclusions
Our study used N2O emission rates and SP values to understand biochar amendment mechanisms and demonstrated that biochar amendment reduces N2O emissions by stimulating the last step of denitrification. It also suggested a possible shift in N2O‐reducing microbial taxa in 4% biochar samples.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||
Journal or Publication Title: | Rapid Communications in Mass Spectrometry | ||||||||
Publisher: | John Wiley & Sons Ltd. | ||||||||
ISSN: | 0951-4198 | ||||||||
Official Date: | 30 January 2019 | ||||||||
Dates: |
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Volume: | 33 | ||||||||
Number: | 2 | ||||||||
Page Range: | pp. 165-175 | ||||||||
DOI: | 10.1002/rcm.8305 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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