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- W2247494309 abstract "Although nitrification is a unique and important process in the nitrogen cycle with respect to ammonium consumption and nitrate production, limited information on this process is available for high-Arctic soils. We elucidated the ammonia oxidation potentials (AOPs) and characteristics of ammonia-oxidizing bacteria (AOB) and archaea (AOA) in mineral soils under climax vegetation, i.e., Salix polaris (polar willow)–moss vegetation, on a coastal hill in Ny-Alesund, Svalbard. AOPs at 10 °C were determined by incubation with sufficient substrate (2 mM ammonium). The ammonia monooxygenase subunit A (amoA) genes of AOB and AOA were analyzed by using quantitative polymerase chain reaction and pyrosequencing. AOPs ranged from 1.1 to 14.1 ng N g−1 dry soil h−1—relatively low but of a similar order to the gross nitrification rates reported in another Svalbard study. AOP was positively correlated with thickness of the moss layer (P < 0.01), soil water content, and ammonium nitrogen content (P < 0.05). The population sizes of both AOB and AOA were not significantly related to AOP or edaphic factors. For AOB-amoA, six major operational taxonomic units (OTUs) were identified, all of which were classified into the Nitrosospira Mount Everest cluster. For AOA-amoA, six major OTUs were also identified, five of which were grouped with sequences from cold environments within clade A of the Nitrososphaera cluster, i.e., species known to have low, or no, AOP. It is, therefore, possible that the AOPs measured at the study site were driven mainly by psychrotolerant AOB." @default.
- W2247494309 created "2016-06-24" @default.
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- W2247494309 date "2015-11-14" @default.
- W2247494309 modified "2023-10-09" @default.
- W2247494309 title "Characteristics of ammonia oxidation potentials and ammonia oxidizers in mineral soil under Salix polaris–moss vegetation in Ny-Ålesund, Svalbard" @default.
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- W2247494309 doi "https://doi.org/10.1007/s00300-015-1829-2" @default.
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