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Mineralization and nitrification: Archaea dominate ammonia-oxidising communities in grassland soils

Clark, Dave R and McKew, Boyd A and Dong, Liang F and Leung, Garwai and Dumbrell, Alex J and Stott, Andrew and Grant, Helen and Nedwell, David B and Trimmer, Mark and Whitby, Corinne (2020) 'Mineralization and nitrification: Archaea dominate ammonia-oxidising communities in grassland soils.' Soil Biology and Biochemistry, 143. ISSN 0038-0717

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Abstract

In grasslands, N mineralization and nitrification are important processes and are controlled by several factors, including the in situ microbial community composition. Nitrification involves ammonia oxidising archaea (AOA) and bacteria (AOB) and although AOA and AOB co-exist in soils, they respond differently to environmental characteristics and there is evidence of AOA/AOB niche differentiation. Here, we investigated temporal variation in N mineralization and nitrification rates, together with bacterial, archaeal and ammonia-oxidiser communities in grassland soils, on different geologies: clay, Greensand and Chalk. Across geologies, N mineralization and nitrification rates were slower in the autumn than the rest of the year. Turnover times for soil ammonium pools were <24 h, whilst several days for nitrate. In clay soils, bacterial, archaeal, AOA, and AOB communities were clearly distinct from those in Chalk and Greensand soils. Spatially and temporally, AOA were more abundant than AOB. Notably, Nitrososphaera were predominant, comprising 37.4% of archaeal communities, with the vast majority of AOA found in Chalk and Greensand soils. AOA abundance positively correlated with nitrate concentration, whereas AOB abundance correlated with ammonium and nitrite concentrations, suggesting that these N compounds may be potential drivers for AOA/AOB niche differentiation in these grassland soils.

Item Type: Article
Uncontrolled Keywords: Nitrification, N mineralization, Ammonia oxidising archaea, Nitrososphaera, amoA gene, Grasslands
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Elements
Date Deposited: 27 Apr 2020 16:02
Last Modified: 14 May 2020 21:15
URI: http://repository.essex.ac.uk/id/eprint/27378

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