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• W2022862057 abstract "Abstract Background/Question/Methods There is increasing evidence that global change can alter the structure of plant communities with large impacts on the functioning of terrestrial ecosystems. However, little is known about the impact of global change on soil microbial communities. In particular, the response of soil nitrite-oxidizers microorganisms that mediate the second step of nitrification, a key process of the nitrogen cycle, has never been investigated.Here, we examined the effects of four main global environmental changes on the activity, the abundance and the diversity of soil nitrite-oxidizers in an annual grassland ecosystem as part of the Jasper Ridge Global Change Experiment (CA, USA). This experiment includes four treatments - CO2, temperature, precipitation and nitrogen - with two levels per treatment (ambient and elevated, with elevated treatment based on prediction for the end of the century), and all of their factorial combinations. We measured potential nitrite oxidation, the abundance of soil Nitrobacter- and Nitrospiralike nitrite-oxidizers (using quantitative PCR targeting nxrA and 16S rRNA gene, respectively) and the diversity of soil Nitrobacter-like nitrite-oxidizers (using cloning sequencing targeting the nxrA gene) in each treatment combination at the end of the 7th and 8th growing seasons under treatments. Furthermore, we analyzed to what extent changes in the activity of the soil nitrite-oxidizers result from changes in their abundance or diversity. Results/Conclusions Simulated global environmental changes significantly altered the activity, as well as the abundance and the diversity of soil nitrite-oxidizers. Potential nitrite oxidation decreased with increased precipitation and increased with elevated CO2 when combined with added nitrogen or precipitation. The abundance of soil Nitrobacter-like nitrite-oxidizers also decreased with increased precipitation and increased with elevated levels of CO2 and nitrogen. In contrast, the abundance of soil Nitrospira-like nitrite-oxidizers increased with enhanced precipitation and decreased with elevated levels of CO2 and temperature. Finally, the structure of the soil Nitrobacter-like nitrite-oxidizers was significantly altered by the treatments. Consistent with results reported by Attard et al. (2010) for agroecosystems, we found that changes in potential rates of nitrite oxidation in response to treatments were partly explained by changes in the abundance of soil Nitrobacter-like nitrite-oxidizers, but not by changes in the abundance of soil Nitrospiralike nitrite-oxidizers, suggesting that Nitrobacter-like nitrite-oxidizers were the main functional players of the soil nitrite-oxidizing microbial community.Our study provides evidence that global change could alter the abundance and diversity of soil nitrite-oxidizers, with potential impacts for soil nitrogen cycling.*The audio track for talks in this symposium may be obtained at the following web address:**https://sites.google.com/site/esa2010symposium13audiocontent/esa2010-symposium13-audio-content*" @default.
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• W2022862057 date "2011-01-10" @default.
• W2022862057 modified "2023-09-30" @default.
• W2022862057 title "Responses of soil nitrite-oxidizers to global environmental changes" @default.
• W2022862057 doi "https://doi.org/10.1038/npre.2011.5509.1" @default.
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