| Title: | Contrasting Warming and Ozone Effects on Denitrifiers Dominate Soil N(2)O Emissions |
| Author(s): | Qiu Y; Jiang Y; Guo L; Burkey KO; Zobel RW; Shew HD; Hu S; |
| Address: | "Department of Entomology and Plant Pathology , North Carolina State University , Raleigh , North Carolina 27695 , United States. College of Resources and Environmental Sciences , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , China. Institute of Applied Ecology , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , China. College of Plant Science and Technology , Huazhong Agricultural University , Wuhan , Hubei 430070 , China. Plant Sciences Research Unit , USDA-ARS , Raleigh , North Carolina 27607 , United States. Department of Crop and Soil Sciences , North Carolina State University , Raleigh , North Carolina 27695 , United States" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Nitrous oxide (N(2)O) in the atmosphere is a major greenhouse gas and reacts with volatile organic compounds to create ozone (an air pollutant) in the troposphere. Climate change factors such as warming and elevated ozone (eO(3)) affect N(2)O fluxes, but the direction and magnitude of these effects are uncertain and the underlying mechanisms remain unclear. We examined the impact of simulated warming (control + 3.6 degrees C) and eO(3) (control + 45 ppb) on soil N(2)O fluxes in a soybean agroecosystem. Results obtained showed that warming significantly increased soil labile C, microbial biomass, and soil N mineralization, but eO(3) reduced these parameters. Warming enhanced N(2)O-producing denitrifers ( nirS- and nirK-type), corresponding to increases in both the rate and sum of N(2)O emissions. In contrast, eO(3) significantly reduced both N(2)O-producing and N(2)O-consuming ( nosZ-type) denitrifiers but had no impact on N(2)O emissions. Further, eO(3) offsets the effects of warming on soil labile C, microbial biomass, and the population size of denitrifiers but still increased N(2)O emissions, indicating a direct effect of temperature on N(2)O emissions. Together, these findings suggest that warming may promote N(2)O production through increasing both the abundance and activities of N(2)O-producing microbes, positively feeding back to the ongoing climate change" |
| Keywords: | *Greenhouse Gases Nitrous Oxide *Ozone Soil Soil Microbiology; |
| Notes: | "MedlineQiu, Yunpeng Jiang, Yu Guo, Lijin Burkey, Kent O Zobel, Richard W Shew, H David Hu, Shuijin eng Research Support, Non-U.S. Gov't 2018/08/30 Environ Sci Technol. 2018 Oct 2; 52(19):10956-10966. doi: 10.1021/acs.est.8b01093. Epub 2018 Sep 11" |
