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Title: Autotrophic ammonia-oxidizing bacteria contribute minimally to nitrification in a nitrogen-impacted forested ecosystem

Author: Jordan, Fiona L.; Cantera, J. Jason L.; Fenn, Mark E.; Stein, Lisa Y.

Date: 2005

Source: Applied and Environmental Microbiology 71(1):197-206

Publication Series: Not categorized

Description: Deposition rates of atmospheric nitrogenous pollutants to forests in the San Bernardino Mountains range east of Los Angeles, California, are the highest reported in North America. Acidic soils from the west end of the range are N-saturated and have elevated rates of N-mineralization, nitrification, and nitrate leaching. We assessed the impact of this heavy nitrogen load on autotrophic ammonia-oxidizing communities by investigating their composition, abundance, and activity. Analysis of 177 cloned β-Proteobacteria ammonia oxidizer 16S rRNA genes from highly to moderately N-impacted soils revealed similar levels of species composition; all of the soils supported the previously characterized Nitrosospira clusters 2, 3, and 4. Ammonia oxidizer abundance measured by quantitative PCR was also similar among the soils.

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Jordan, Fiona L.; Cantera, J. Jason L.; Fenn, Mark E.; Stein, Lisa Y. 2005. Autotrophic ammonia-oxidizing bacteria contribute minimally to nitrification in a nitrogen-impacted forested ecosystem. Applied and Environmental Microbiology 71(1):197-206

 


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