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Journal article
Application of Bayesian statistics to estimate nitrous oxide emission factors of three nitrogen fertilisers on UK grasslands
Environment international, Vol.128, pp.362-370
2019
PMID: 31078005
Abstract
Trapezoidal integration by linear interpolation of data points is by far the most commonly used method of cumulative flux calculations of nitrous oxide (N2O) in studies that use flux chambers; however, this method is incapable of providing accurate uncertainty estimates. A Bayesian approach was used to calculate N2O emission factors (EFs) and their associated uncertainties from flux chamber measurements made after the application of nitrogen fertilisers, in the form of ammonium nitrate (AN), urea (Ur) and urea treated with Agrotain® urease inhibitor (UI) at four grassland sites in the UK. The comparison between the cumulative fluxes estimated using the Bayesian and linear interpolation methods were broadly similar (R2 = 0.79); however, the Bayesian method was capable of providing realistic uncertainties when a limited number of data points is available. The study reports mean EF values (and 95% confidence intervals) of 0.60 ± 0.63, 0.29 ± 0.22 and 0.26 ± 0.17% of applied N emitted as N2O for the AN, Ur and UI treatments, respectively. There was no significant difference between N2O emissions from the Ur and UI treatments. In the case of the automatic chamber data collected at one site in this study, the data did not fit the log-normal model, implying that more complex models may be needed, particularly for measurement data with high temporal resolution.
Details
- Title
- Application of Bayesian statistics to estimate nitrous oxide emission factors of three nitrogen fertilisers on UK grasslands
- Authors/Creators
- N. Cowan - UK Centre for Ecology & HydrologyP. Levy - UK Centre for Ecology & HydrologyJ. Drewer - UK Centre for Ecology & HydrologyA. Carswell - Rothamsted ResearchR. Shaw - Bangor UniversityI. Simmons - UK Centre for Ecology & HydrologyC. Bache - UK Centre for Ecology & HydrologyJ. Marinheiro - Centre for Ecology and HydrologyJ. Brichet - UK Centre for Ecology & HydrologyA.R. Sanchez-Rodriguez - Bangor UniversityJ. Cotton - Bangor UniversityP.W. Hill - Bangor UniversityD.R. Chadwick - Bangor UniversityD.L. Jones - The University of Western AustraliaT.H. Misselbrook - Rothamsted ResearchU. Skiba - UK Centre for Ecology & Hydrology
- Publication Details
- Environment international, Vol.128, pp.362-370
- Publisher
- Elsevier Ltd
- Identifiers
- 991005560441407891
- Copyright
- © 2019 The Authors.
- Murdoch Affiliation
- Centre for Sustainable Farming Systems
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.45 Soil Science
- 3.45.397 Nitrogen Management
- Web Of Science research areas
- Environmental Sciences
- ESI research areas
- Environment/Ecology