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

Frontiers of Earth Science
By: , and 

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Abstract

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 oxidizer 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.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Moisture and temperature controls on nitrification differ among ammonia oxidizer communities from three alpine soil habitats
Series title Frontiers of Earth Science
DOI 10.1007/s11707-015-0556-x
Volume 10
Issue 1
Year Published 2016
Language English
Publisher Springer
Contributing office(s) Fort Collins Science Center
Description 12 p.
First page 1
Last page 12
Country United States
State Colorado
Online Only (Y/N) N