Evidence that ammonia-oxidizing archaea are more abundant than ammonia-oxidizing bacteria in semiarid soils of northern Arizona, USA
Evidence that ammonia-oxidizing archaea are more abundant than ammonia-oxidizing bacteria in semiarid soils of northern Arizona, USA
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DOI：
10.1007/s00248-007-9360-9
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发表时间：
2008-10-01
影响因子：
3.6
通讯作者：
Schwartz, Egbert
中科院分区：
文献类型：
--
作者：
Adair, Karen L.;Schwartz, Egbert
自养氨氧化群落在大多数土壤中是硝化反应的限速步骤，但在半干旱生态系统中还没有得到广泛的研究。在亚利桑那州北部的海拔梯度上，用实时聚合酶链式反应测量了土壤古生菌和细菌AMOA的丰度。古生菌Amoa在所有地点都是Amoa的主要形式；然而，古生菌与细菌Amoa的比率从17到1600以上不等。虽然氨氧化细菌种群的大小与降雨量、温度、含沙率和土壤C/N有关，但氨氧化古细菌种群与本研究中评估的任何环境参数都没有显著的关系。我们的结果表明，在这些土壤中，古生菌可能是主要的氨氧化菌，氨氧化古生菌和氨氧化菌占据不同的生态位。
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.