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dc.contributor.author
Fuchs, Kathrin
dc.contributor.author
Hörtnagl, Lukas
dc.contributor.author
Buchmann, Nina
dc.contributor.author
Eugster, Werner
dc.contributor.author
Snow, Val
dc.contributor.author
Merbold, Lutz
dc.date.accessioned
2020-01-29T14:48:53Z
dc.date.available
2018-10-04T05:52:20Z
dc.date.available
2018-10-04T15:25:54Z
dc.date.available
2020-01-29T14:48:53Z
dc.date.issued
2018
dc.identifier.issn
1726-4170
dc.identifier.issn
1726-4170
dc.identifier.other
10.5194/bg-15-5519-2018
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/293184
dc.identifier.doi
10.3929/ethz-b-000293184
dc.description.abstract
Replacing fertiliser nitrogen with biologically fixed nitrogen (BFN) through legumes has been suggested as a strategy for nitrous oxide (N2O) mitigation from intensively managed grasslands. While current literature provides evidence for an N2O emission reduction effect due to reduced fertiliser input, little is known about the effect of increased legume proportions potentially offsetting these reductions, i.e. by increased N2O emissions from plant residues and root exudates. In order to assess the overall effect of this mitigation strategy on permanent grassland, we performed an in situ experiment and quantified net N2O fluxes and biomass yields in two differently managed grass–clover mixtures. We measured N2O fluxes in an unfertilised parcel with high clover proportions vs. an organically fertilised control parcel with low clover proportions using the eddy covariance (EC) technique over 2 years. Furthermore, we related the measured N2O fluxes to management and environmental drivers. To assess the effect of the mitigation strategy, we measured biomass yields and quantified biologically fixed nitrogen using the 15N natural abundance method. The amount of BFN was similar in both parcels in 2015 (control: 55±5kgNha−1yr−1; clover parcel: 72±5kgNha−1yr−1) due to similar clover proportions (control: 15% and clover parcel: 21%), whereas in 2016 BFN was substantially higher in the clover parcel compared to the much lower control (control: 14±2kgNha−1yr−1 with 4% clover in DM; clover parcel: 130±8kgNha−1yr−1 and 44% clover). The mitigation management effectively reduced N2O emissions by 54% and 39% in 2015 and 2016, respectively, corresponding to 1.0 and 1.6tha−1yr−1CO2 equivalents. These reductions in N2O emissions can be attributed to the absence of fertilisation on the clover parcel. Differences in clover proportions during periods with no recent management showed no measurable effect on N2O emissions, indicating that the decomposition of plant residues and rhizodeposition did not compensate for the effect of fertiliser reduction on N2O emissions. Annual biomass yields were similar under mitigation management, resulting in a reduction of N2O emission intensities from 0.42gN2O-Nkg−1DM (control) to 0.28gN2O-Nkg−1DM (clover parcel) over the 2-year observation period. We conclude that N2O emissions from fertilised grasslands can be effectively reduced without losses in yield by increasing the clover proportion and reducing fertilisation.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Management matters: testing a mitigation strategy for nitrous oxide emissions using legumes on intensively managed grassland
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2018-09-18
ethz.journal.title
Biogeosciences
ethz.journal.volume
15
en_US
ethz.journal.issue
18
en_US
ethz.pages.start
5519
en_US
ethz.pages.end
5543
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Robust models for assessing the effectiveness of technologies and managements to reduce N2O emissions from grazed pastures (Models4Pastures)
en_US
ethz.identifier.wos
ethz.identifier.scopus
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::03648 - Buchmann, Nina / Buchmann, Nina
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::03648 - Buchmann, Nina / Buchmann, Nina
ethz.grant.agreementno
154245
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
FACCE-JPI
ethz.relation.isNewVersionOf
10.3929/ethz-b-000300095
ethz.date.deposited
2018-10-04T05:53:18Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-10-04T15:26:13Z
ethz.rosetta.lastUpdated
2020-02-15T23:55:27Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=Management%20matters:%20testing%20a%20mitigation%20strategy%20for%20nitrous%20oxide%20emissions%20using%20legumes%20on%20intensively%20managed%20grassland&rft.jtitle=Biogeosciences&rft.date=2018&rft.volume=15&rft.issue=18&rft.spage=5519&rft.epage=5543&rft.issn=1726-4170&1726-4170&rft.au=Fuchs,%20Kathrin&H%C3%B6rtnagl,%20Lukas&Buchmann,%20Nina&Eugster,%20Werner&Snow,%20Val&rft.genre=article&
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