期刊
MICROBIAL ECOLOGY
卷 56, 期 3, 页码 420-426出版社
SPRINGER
DOI: 10.1007/s00248-007-9360-9
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资金
- Office of Science (BER)
- U. S. Department of Energy [DE-FG02-04ER63883]
- National Science Foundation [DEB-0416223]
- NSF IGERT [DGE-0549505]
Autotrophic ammonia-oxidizing communities, which are responsible for the rate-limiting step of nitrification in most soils, have not been studied extensively in semiarid ecosystems. Abundances of soil archaeal and bacterial amoA were measured with real-time polymerase chain reaction along an elevation gradient in northern Arizona. Archaeal amoA was the predominant form of amoA at all sites; however, ratios of archaeal to bacterial amoA ranged from 17 to more than 1,600. Although size of ammonia-oxidizing bacteria populations was correlated with precipitation, temperature, percent sand, and soil C/N, there were no significant relationships between ammonia-oxidizing archaea populations and any of the environmental parameters evaluated in this study. Our results suggest that in these soils, archaea may be the primary ammonia oxidizers, and that ammonia-oxidizing archaea and ammonia-oxidizing bacteria occupy different niches.
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