Moisture and temperature controls on nitrification differ among ammonia oxidizer communities from three alpine soil habitats

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• 作者：Brooke B. Osborne ; Jill S. Baron ; Matthew D. Wallenstein
• 关键词：ammonia ; oxidizing archaea (AOA) ; ammonia ; oxidizing bacteria (AOB) ; global change ; Loch Vale watershed ; nitrification ; thermal adaptation
• 刊名：Frontiers of Earth Science
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：10
• 期：1
• 页码：1-12
• 全文大小：1,010 KB
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• 作者单位：Brooke B. Osborne (1) (2)
  Jill S. Baron (1) (3)
  Matthew D. Wallenstein (1) (4)
  
  1. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO, 80523, USA
  2. Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, 02912, USA
  3. U.S. Geological Survey Fort Collins Science Center, Fort Collins, CO, 80526, USA
  4. Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO, 80523, USA
  
• 刊物主题：Earth Sciences, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：2095-0209

文摘

Climate change is altering the timing and magnitude of biogeochemical fluxes in many highelevation ecosystems. The consequent changes in alpine nitrification rates have the potential to influence ecosystem scale responses. In order to better understand how changing temperature and moisture conditions may influence ammonia oxidizers and nitrification activity, we conducted laboratory incubations on soils collected in a Colorado watershed from three alpine habitats (glacial outwash, talus, and meadow). We found that bacteria, not archaea, dominated all ammonia oxidizer communities. Nitrification increased with moisture in all soils and under all temperature treatments. However, temperature was not correlated with nitrification rates in all soils. Site-specific temperature trends suggest the development of generalist ammonia oxidzer communities in soils with greater in situ temperature fluctuations and specialists in soils with more steady temperature regimes. Rapidly increasing temperatures and changing soil moisture conditions could explain recent observations of increased nitrate production in some alpine soils. Keywords ammonia-oxidizing archaea (AOA) ammonia- oxidizing bacteria (AOB) global change Loch Vale watershed nitrification thermal adaptation