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

作     者：Brooke B. OSBORNE Jill S. BARON Matthew D. WALLENSTEIN 

作者机构：Natural Resource Ecology Laboratory Colorado State University Fort Collins CO 80523 USA Present address: Department of Ecology and Evolutionary Biology Brown University Providence RI 02912 USA U.S. Geological Survey Fort Collins Science Center Fort Collins CO 80526 USA Department of Ecosystem Science and Sustainability Colorado State University Fort Collins CO 80523 USA 

出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)

年 卷 期：2016年第10卷第1期

页      面：1-12页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 09[农学] 0903[农学-农业资源与环境] 0706[理学-大气科学] 090301[农学-土壤学] 

基　　金：Francis Clark Soil Biology Scholarship USGS Western U.S. Geological Survey, USGS 

主　　题：ammonia-oxidizing archaea (AOA) ammo-nia-oxidizing bacteria (AOB) global change Loch Valewatershed nitrification thermal adaptation 

摘      要：Climate change is altering the timing and magnitude of biogeochemical fluxes in many high- elevation 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 tempera- tures and changing soil moisture conditions could explain recent observations of increased nitrate production in some alpine soils.