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dc.contributor.author
Griepentrog, Marco
dc.contributor.author
Upadhayay, Hari R.
dc.contributor.author
Bodé, Samuel
dc.contributor.author
Haghipour, Negar
dc.contributor.author
Boeckx, Pascal
dc.contributor.author
Eglinton, Timothy I.
dc.date.accessioned
2020-01-28T12:28:39Z
dc.date.available
2020-01-28T08:16:33Z
dc.date.available
2020-01-28T12:28:39Z
dc.date.issued
2018-04-12
dc.identifier.issn
1029-7006
dc.identifier.issn
1607-7962
dc.identifier.uri
http://hdl.handle.net/20.500.11850/394682
dc.identifier.doi
10.3929/ethz-b-000394682
dc.description.abstract
There is currently a lack of necessary measurements and data to fully capture the high degree of heterogeneity inorganic carbon (OC) exported from eroding landscapes. The respective fluxes of modern (biospheric) and aged OCare poorly constrained, and mechanisms controlling OC export have remained elusive. Recently, the age of riverineOC was found to increase with the proportion of human-dominated landscapes within a catchment, potentially dueto aged soil OC that is mobilized by human disturbance and reintroduced into the modern C cycle (Butman et al.,2015). Furthermore, most previous studies have focused on catchment outlets, whereas a greater within-catchmentfocus will undoubtedly provide further direction to pinpoint locations of aged OC export to the river, and to betterconstrain its impact on the C cycle and aquatic biogeochemistry.This study aims (1) to quantify the sources and proportions of modern versus aged OC exported from soils intoriver systems within a catchment and (2) to investigate if theses sources and proportions of OC are dependent onthe different types of land-use within a catchment. Therefore, bulk14C and compound-specific14C analyses ofvegetation markers (long-chain fatty acids, FAs) in soils under different land-use and suspended river sedimentswill be performed and the proportions of modern versus aged OC determined by application of isotope mixingmodels.The study site is located in the mid-hill region of Nepal within a catchment that exhibits different land-uses includ-ing various types of forest and agricultural land-use. Soils were sampled before and sediments during monsoonseasons. A broad data basis is already available for the content and stable C isotopes (δ13C) of bulk OC and FAs.Fatty acids will be collected in sufficient amounts by preparative gas chromatography and will be analyzed for14Cusing accelerator mass spectrometry. Isotope mixing models that use bulk and compound-specific13C and14Cdata will be applied to estimate the relative contributions of modern versus aged OC.The study will generate an extensive14C dataset of bulk OC and specific vegetation markers in soils under differentland-use and suspended river sediments to provide a within-catchment focus on the mechanisms controlling OCexport from terrestrial and aquatic ecosystems. Combination with the available complementary datasets for13Cof bulk OC and specific vegetation markers will reveal the sources and proportions of modern versus aged OCwithin the catchment. This information is needed to develop accurate constraints on fluvial transfer of modernOC, which is of importance to predict OC fluxes quantitatively as a result of anthropogenic change. The studyfurthermore aims to test whether soils under different land-use export different proportions of modern versus agedOC into river systems and thus determines the responds to human disturbance such as changes in soil management.In summary, our study will contribute to a comprehensive understanding of the factors that control the sources,transport pathways and turnover times of terrestrial OC within river systems.
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
Sources and proportions of modern versus aged organic carbon eroded from soils under different land-use within a Nepalese catchment – Insights from bulk and compound-specific 13C & 14C analysis in combination with novel isotope mixing models
en_US
dc.type
Other Conference Item
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Geophysical Research Abstracts
ethz.journal.volume
20
en_US
ethz.journal.abbreviated
GRA
ethz.pages.start
EGU2018-12474
en_US
ethz.size
1 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.event
EGU General Assembly 2018
en_US
ethz.event.location
Vienna, Austria
en_US
ethz.event.date
April 8-13, 2018
en_US
ethz.notes
Conference lecture held on April 12, 2018
en_US
ethz.grant
Sources and proportions of modern and aged organic carbon eroded from soils under different land-use within catchments in Nepal – Insights from compound-specific 13C & 14C analysis and novel mixing models
en_US
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::02722 - Institut für Terrestrische Oekosysteme / Institute of Terrestrial Ecosystems::09646 - Dötterl, Sebastian / Dötterl, Sebastian
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::03868 - Eglinton, Timothy I. / Eglinton, Timothy I.
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02722 - Institut für Terrestrische Oekosysteme / Institute of Terrestrial Ecosystems::09646 - Dötterl, Sebastian / Dötterl, Sebastian
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::03868 - Eglinton, Timothy I. / Eglinton, Timothy I.
en_US
ethz.grant.agreementno
174300
ethz.grant.agreementno
174300
ethz.grant.fundername
SNF
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Rückkehr CH Advanced Postdoc.Mobility
ethz.date.deposited
2020-01-28T08:16:41Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-01-28T12:28:49Z
ethz.rosetta.lastUpdated
2021-02-15T07:42:40Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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