Hot moments of N<inf>2</inf>O transformation and emission in tropical soils from the Pantanal and the Amazon (Brazil)

Liengaard, L; Figueiredo, V; Markfoged, R; Revsbech, NP; Nielsen, LP; Prast, AE; Kühl, M

Hot moments of N<inf>2</inf>O transformation and emission in tropical soils from the Pantanal and the Amazon (Brazil)

Liengaard, L Figueiredo, V Markfoged, R Revsbech, NP Nielsen, LP Prast, AE Kühl, M

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Publication Type:: Journal Article
Citation:: Soil Biology and Biochemistry, 2014, 75 pp. 26 - 36
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Liengaard, L	en_US
dc.contributor.author	Figueiredo, V	en_US
dc.contributor.author	Markfoged, R	en_US
dc.contributor.author	Revsbech, NP	en_US
dc.contributor.author	Nielsen, LP	en_US
dc.contributor.author	Prast, AE	en_US
dc.contributor.author	Kühl, M https://orcid.org/0000-0002-1792-4790	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Soil Biology and Biochemistry, 2014, 75 pp. 26 - 36	en_US
dc.identifier.issn	0038-0717	en_US
dc.identifier.uri	http://hdl.handle.net/10453/35906
dc.description.abstract	Tropical wetland soils emit large amounts of nitrous oxide (N2O), especially following wetting of drained soil. We investigated seasonally drained wetland soils from the Pantanal and the Amazon, both with a natural high nitrate content and low pH. Here we report the effect of wetting on the production, emission and consumption of N2O on these soils. Intact soil cores were wetted to simulate natural water logging events, and microsensor measurements were used to i) characterize the vertical microscale distribution of O2 and N2O, ii) monitor the accumulation of N2O in the anoxic soil volume, and iii) quantify the N2O efflux out of the soil. Flux chamber measurements of N2O emission confirmed the effluxes calculated from microsensor measurements.The N2O concentration dynamics in the soil cores were characterized by three distinct phases: 1) an initial slow N2O production, 2) a higher N2O production ending abruptly when the supply of NO3- and NO2- (NOx-) was exhausted, and 3) a final phase where the accumulated N2O was reduced to N2. This evolution of the N2O pool in an intact soil core could be accurately simulated by a simple diffusion-reaction model with the presence of O2 and NOx- as determining factors.Approximately one third of the initial NO3- present in the soil was lost as N2O or N2. As the soil was depleted for NO3- by the end of the experiment we suggest that dissimilatory nitrate reduction to ammonia (DNRA) was responsible for reducing the remaining NO3-. © 2014 Elsevier Ltd.	en_US
dc.relation.ispartof	Soil Biology and Biochemistry	en_US
dc.relation.isbasedon	10.1016/j.soilbio.2014.03.015	en_US
dc.subject.classification	Agronomy & Agriculture	en_US
dc.title	Hot moments of N<inf>2</inf>O transformation and emission in tropical soils from the Pantanal and the Amazon (Brazil)	en_US
dc.type	Journal Article
utslib.citation.volume	75	en_US
utslib.for	050303 Soil Biology	en_US
utslib.for	0502 Environmental Science and Management	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	75	en_US

Abstract:

Tropical wetland soils emit large amounts of nitrous oxide (N2O), especially following wetting of drained soil. We investigated seasonally drained wetland soils from the Pantanal and the Amazon, both with a natural high nitrate content and low pH. Here we report the effect of wetting on the production, emission and consumption of N2O on these soils. Intact soil cores were wetted to simulate natural water logging events, and microsensor measurements were used to i) characterize the vertical microscale distribution of O2 and N2O, ii) monitor the accumulation of N2O in the anoxic soil volume, and iii) quantify the N2O efflux out of the soil. Flux chamber measurements of N2O emission confirmed the effluxes calculated from microsensor measurements.The N2O concentration dynamics in the soil cores were characterized by three distinct phases: 1) an initial slow N2O production, 2) a higher N2O production ending abruptly when the supply of NO3- and NO2- (NOx-) was exhausted, and 3) a final phase where the accumulated N2O was reduced to N2. This evolution of the N2O pool in an intact soil core could be accurately simulated by a simple diffusion-reaction model with the presence of O2 and NOx- as determining factors.Approximately one third of the initial NO3- present in the soil was lost as N2O or N2. As the soil was depleted for NO3- by the end of the experiment we suggest that dissimilatory nitrate reduction to ammonia (DNRA) was responsible for reducing the remaining NO3-. © 2014 Elsevier Ltd.

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http://hdl.handle.net/10453/35906