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Influence of elevated atmospheric carbon dioxide and supplementary irrigation on greenhouse gas emissions from a spring wheat crop in southern Australia

Published online by Cambridge University Press:  31 July 2012

S. K. LAM ,
D. CHEN ,
R. NORTON ,
R. ARMSTRONG  and
A. R. MOSIER
S. K. LAM
Affiliation:
Melbourne School of Land and Environment, The University of Melbourne, Victoria 3010, Australia
D. CHEN*
Affiliation:
Melbourne School of Land and Environment, The University of Melbourne, Victoria 3010, Australia
R. NORTON
Affiliation:
Melbourne School of Land and Environment, The University of Melbourne, Victoria 3010, Australia International Plant Nutrition Institute, 54 Florence Street, Horsham, Victoria 3400, Australia
R. ARMSTRONG
Affiliation:
Department of Primary Industries, Private Bag 260, Horsham, Victoria 3401, Australia
A. R. MOSIER
Affiliation:
Melbourne School of Land and Environment, The University of Melbourne, Victoria 3010, Australia
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

The effect of elevated carbon dioxide (CO2) concentration on greenhouse gas (GHG) emission from semi-arid cropping systems is poorly understood. Closed static chambers were used to measure the fluxes of nitrous oxide (N2O), CO2 and methane (CH4) from a spring wheat (Triticum aestivum L. cv. Yitpi) crop-soil system at the Australian grains free-air carbon dioxide enrichment (AGFACE) facility at Horsham in southern Australia in 2009. The targeted atmospheric CO2 concentrations (hereafter CO2 concentration is abbreviated as [CO2]) were 390 (ambient) and 550 (elevated) μmol/mol for both rainfed and supplementary irrigated treatments. Gas measurements were conducted at five key growth stages of wheat. Elevated [CO2] increased the emission of N2O and CO2 by 108 and 29%, respectively, with changes being greater during the wheat vegetative stage. Supplementary irrigation reduced N2O emission by 36%, suggesting that N2O was reduced to N2 in the denitrification process. Irrigation increased CO2 flux by 26% at ambient [CO2] but not at elevated [CO2], and had no impact on CH4 flux. The present results suggest that under future atmospheric [CO2], agricultural GHG emissions at the vegetative stage may be higher and irrigation is likely to reduce the emissions from semi-arid cropping systems.

Type
Climate Change and Agriculture Research Paper
Information
The Journal of Agricultural Science , Volume 151 , Issue 2 , April 2013 , pp. 201 - 208
Copyright
Copyright © Cambridge University Press 2012

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