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dc.contributor.author
Hunt, John E.
dc.contributor.author
Laubach, Johannes
dc.contributor.author
Barthel, Matti
dc.contributor.author
Fraser, Anitra
dc.contributor.author
Phillips, Rebecca L.
dc.date.accessioned
2018-10-01T16:03:41Z
dc.date.available
2017-06-12T08:29:48Z
dc.date.available
2018-10-01T16:03:41Z
dc.date.issued
2016
dc.identifier.other
10.5194/bg-13-2927-2016
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/117996
dc.identifier.doi
10.3929/ethz-b-000117996
dc.description.abstract
Intensification of pastoral agriculture is occurring rapidly across New Zealand, including increasing use of irrigation and fertiliser application in some regions. While this enables greater gross primary production (GPP) and livestock grazing intensity, the consequences for the net ecosystem carbon budget (NECB) of the pastures are poorly known. Here, we determined the NECB over one year for an irrigated, fertilised and rotationally grazed dairy pasture and a neighbouring unirrigated, unfertilised, winter-grazed pasture. Primary terms in the NECB calculation were: net ecosystem production (NEP), biomass carbon removed by grazing cows and carbon (C) input from their excreta. Annual NEP was measured using the eddy-covariance method. Carbon removal was estimated with plate-meter measurements calibrated against biomass collections, pre- and post-grazing. Excreta deposition was calculated from animal feed intake. The intensively managed pasture gained C (NECB = 103±42g Cm−2yr−1) but would have been subject to a non-significant C loss if cattle excreta had not been returned to the pasture. The unirrigated pasture was C-neutral (NECB = −13±23g Cm−2yr−1). While annual GPP of the former was almost twice that of the latter (2679 vs. 1372g Cm−2yr−1), ecosystem respiration differed by only 68% between the two pastures (2271 vs. 1352g Cm−2yr−1). The ratio of GPP to the total annual water input of the irrigated pasture was 37% greater than that of the unirrigated pasture, i.e. the former used the water input more efficiently than the latter to produce biomass. The NECB results agree qualitatively with those from many other eddy-covariance studies of grazed grasslands, but they seem to be at odds with long-term carbon-stock studies of other New Zealand pastures.
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Carbon budgets for an irrigated intensively grazed dairy pasture and an unirrigated winter-grazed pasture
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2016-05-18
ethz.journal.title
Biogeosciences
ethz.journal.volume
13
en_US
ethz.journal.issue
10
en_US
ethz.pages.start
2927
en_US
ethz.pages.end
2944
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
006289717
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02703 - Institut für Agrarwissenschaften / Institute of Agricultural Sciences::03982 - Six, Johan / Six, Johan
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02703 - Institut für Agrarwissenschaften / Institute of Agricultural Sciences::03982 - Six, Johan / Six, Johan
ethz.date.deposited
2017-06-12T08:30:55Z
ethz.source
ECIT
ethz.identifier.importid
imp593654844601c17128
ethz.ecitpid
pub:179934
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-26T04:01:54Z
ethz.rosetta.lastUpdated
2019-01-02T14:19:06Z
ethz.rosetta.versionExported
true
ethz.COinS
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