Influence of crop rotation and liming on greenhouse gas emissions from a semi-arid soil

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dc.creatorBarton, L.
dc.creatorMurphy, D.V.
dc.creatorButterbach-Bahl, Klaus
dc.date2013-03
dc.date2014-02-02T10:15:49Z
dc.date2014-02-02T10:15:49Z
dc.date.accessioned2026-06-27T17:06:06Z
dc.descriptionSemi-arid lands represent one fifth of the global land area but our understanding of greenhouse gas fluxes from these regions is poor. We investigated if inclusion of a grain legume and/or lime in a crop rotation altered greenhouse gas emissions from an acidic soil. Nitrous oxide (N2O) and methane (CH4) fluxes were measured from a rain-fed, cropped soil in a semi-arid region of Australia for two years on a subdaily basis. The randomised-block design included two cropping rotations (lupin–wheat, wheat–wheat) by two liming treatments (0, 3.5 t ha−1) by three replicates. The lupin–wheat rotation only received N fertilizer during the wheat phase (20 kg N ha−1), while the wheat–wheat received 125 kg N ha−1 during the two year study. Fluxes were measured using soil chambers connected to a fully automated system that measured N2O and CH4 by gas chromatography. Nitrous oxide fluxes were low (−1.4 to 9.2 g N2ON ha−1 day−1), and less than those reported for arable soils in temperate climates. Including a grain legume in the cropping rotation did not enhance soil N2O; total N2O losses were approximately 0.1 kg N2O-N ha−1 after two years for both lupin–wheat and wheat–wheat rotations when averaged across liming treatment. Liming decreased cumulative N2O emissions from the wheat–wheat rotation by 30% by lowering the contribution of N2O emissions following summer–autumn rainfall events, but had no effect on N2O emissions from the lupin–wheat rotation. Daily CH4 fluxes ranged from −14 to 5 g CH4-C ha−1 day−1. Methane uptake after two years was lower from the wheat–wheat rotation (601 g CH4-C ha−1) than from either lupin–wheat rotations (967 g CH4-C ha−1), however liming the wheat–wheat rotation increased CH4 uptake (1078 g CH4-C ha−1) to a value similar to the lupin–wheat rotation. Liming provides a strategy for lowering on-farm greenhouse gas emissions from N fertilised soils in semi-arid environments via decreased N2O fluxes and increased CH4 uptake.
dc.identifierhttps://hdl.handle.net/10568/34484
dc.identifier.urihttp://hdl.handle.net/123456789/142226
dc.languageen
dc.publisherElsevier
dc.rightsLimited Access
dc.sourceBarton, L., Murphy, D.V. and Butterbach-Bahl, K. 2013. Influence of crop rotation and liming on greenhouse gas emissions from a semi-arid soil. Agriculture, Ecosystems and Environment 167: 23 - 32
dc.subjectagriculture
dc.subjectsoil
dc.subjectcrops
dc.titleInfluence of crop rotation and liming on greenhouse gas emissions from a semi-arid soil
dc.typeJournal Article

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