ORCID Profile
0000-0002-5978-5274
Current Organisation
Lincoln University
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Publisher: Elsevier BV
Date: 09-2015
Publisher: Wiley
Date: 05-2016
Publisher: Elsevier BV
Date: 06-2006
Publisher: Wiley
Date: 20-07-2021
Publisher: Springer Science and Business Media LLC
Date: 1998
Publisher: Elsevier BV
Date: 06-2013
Publisher: American Geophysical Union (AGU)
Date: 04-2016
DOI: 10.1002/2015WR017642
Publisher: Informa UK Limited
Date: 08-08-2012
Publisher: Oxford University Press (OUP)
Date: 17-10-2012
Abstract: Microbial denitrification plays a key role in determining the availability of soil nitrogen (N) to plants. However, factors influencing the structure and function of denitrifier communities in the rhizosphere remain unclear. Waterlogging can result in root anoxia and increased denitrification, leading to significant N loss from soil and potential nitrous oxide (N(2)O) emissions. This study investigated denitrifier gene abundance, community structure and activity in the rhizosphere of wheat in response to anoxia and N limitation. Denitrifier community structure in the rhizosphere differed from that in bulk soil, and denitrifier gene copy numbers (nirS, nirK, nosZ) and potential denitrification activity were greater in the rhizosphere. Anoxia and N limitation, and in particular a combination of both, reduced the magnitude of this effect on gene abundance (in particular nirS) and activity, with N limitation having greater impact than waterlogging in rhizosphere soil, in contrast to bulk soil where the impact of waterlogging was greater. Increased N supply to anoxic plants improved plant health and increased rhizosphere soil pH, which resulted in enhanced reduction of N(2)O. Both anoxia and N limitation significantly influenced the structure and function of denitrifier communities in the rhizosphere, with reduced root-derived carbon postulated to play an important role.
Publisher: Wiley
Date: 05-2010
Publisher: Wiley
Date: 09-2013
Publisher: Springer Science and Business Media LLC
Date: 18-08-2010
Publisher: Wiley
Date: 03-2020
DOI: 10.1002/SAJ2.20033
Publisher: Wiley
Date: 02-07-2009
No related grants have been discovered for Tim Clough.