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dc.contributor.author
Zurbrügg, Roland
dc.contributor.author
Suter, S.
dc.contributor.author
Lehmann, Moritz Felix
dc.contributor.author
Wehrli, Bernhard
dc.contributor.author
Senn, David B.
dc.date.accessioned
2018-09-19T09:54:59Z
dc.date.available
2017-06-10T14:24:14Z
dc.date.available
2018-09-19T09:54:59Z
dc.date.issued
2013
dc.identifier.other
10.5194/bg-10-23-2013
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/64162
dc.identifier.doi
10.3929/ethz-b-000064162
dc.description.abstract
Tropical floodplains play an important role in organic matter transport, storage, and transformation between headwaters and oceans. However, the fluxes and quality of organic carbon (OC) and organic nitrogen (ON) in tropical river-floodplain systems are not well constrained. We explored the quantity and characteristics of dissolved and particulate organic matter (DOM and POM, respectively) in the Kafue River flowing through the Kafue Flats (Zambia), a tropical river-floodplain system in the Zambezi River basin. During the flooding season, > 80% of the Kafue River water passed through the floodplain, mobilizing large quantities of OC and ON, which resulted in a net export of 69–119 kg OC km−2 d−1 and 3.8–4.7 kg ON km−2 d−1, 80% of which was in the dissolved form. The elemental C : N ratio of ~ 20, the comparatively high δ13C values of −25‰ to −21‰, and its spectroscopic properties (excitation-emission matrices) showed that DOM in the river was mainly of terrestrial origin. Despite a threefold increase in OC loads due to inputs from the floodplain, the characteristics of the riverine DOM remained relatively constant along the sampled 410-km river reach. This suggests that floodplain DOM displayed properties similar to those of DOM leaving the upstream reservoir and implied that the DOM produced in the reservoir was relatively short-lived. In contrast, the particulate fraction was 13C-depleted (−29‰) and had a C : N ratio of ~ 8, which indicated that POM originated from phytoplankton production in the reservoir and in the floodplain, rather than from plant debris or resuspended sediments. While the upstream dam had little effect on the DOM pool, terrestrial particles were retained, and POM from algal and microbial sources was released to the river. A nitrogen mass balance over the 2200 km2 flooded area revealed an annual deficit of 15 500–22 100 t N in the Kafue Flats. The N isotope budget suggests that these N losses are balanced by intense N-fixation. Our study shows that the Kafue Flats are a significant local source of OC and ON to downstream ecosystems and illustrates how the composition of riverine OM can be altered by dams and floodplains in tropical catchments.
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
Organic carbon and nitrogen export from a tropical dam-impacted floodplain system
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2013-01-04
ethz.journal.title
Biogeosciences
ethz.journal.volume
10
en_US
ethz.journal.issue
1
en_US
ethz.pages.start
23
en_US
ethz.pages.end
38
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
006289717
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::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03328 - Wehrli, Bernhard / Wehrli, Bernhard
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03328 - Wehrli, Bernhard / Wehrli, Bernhard
ethz.date.deposited
2017-06-10T14:25:37Z
ethz.source
ECIT
ethz.identifier.importid
imp593650634afe884671
ethz.ecitpid
pub:101903
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-19T12:52:32Z
ethz.rosetta.lastUpdated
2019-01-02T14:09:02Z
ethz.rosetta.versionExported
true
ethz.COinS
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