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Temporal isotopic variations of dissolved silicon in a pristine boreal river
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-4505-4590
Vise andre og tillknytning
2009 (engelsk)Inngår i: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 73, nr 13, Suppl. S, s. A333-Artikkel i tidsskrift, Meeting abstract (Annet vitenskapelig) Published
Abstract [en]

Interest in quantifying the biogenic impact on the terrestrial biogeochemical Si cycle has increased significantly since biological control has been suggested. Previous observations of isotopic fractionation of Si during biogeochemical and geochemical processes imply that seasonal dissolved Si isotopic patterns in rivers have the potential for use in extracting information about the riverineand terrestrial biogeochemical Si cycles.Therefore, variations in the isotopic composition of dissolved riverine Si were investigated for the Kalix River, Northern Sweden, one of the largest pristine rivers in Europe, based on high-frequency sampling during a period of 25 weeks from early April to early October 2006. Temporal variations spanning 0.4. for δ29Si and 0.8. for δ30Si of dissolved Si in the Kalix River were observed during the period, suggesting that the riverine Si input to the oceans cannot be considered to have a constant Si isotopic composition even on a short time scale. The results implicate biogeochemical Si-cycling via formation and dissolution of biogenic silica as major processes controlling the Si transport in boreal systems. The Si budget in the river system appeared to be controlled by relative Si accretions during high discharge events and relative Si depletions in the subarctic mountainous and lake dominated areas. There were also temporal variations in Si isotopic composition with accretion (relative Si contribution), accompanied by depletion of the heavier Si isotopes, while the opposite trend was observed during periods of riverine Si depletion. These isotope variations can be explained by release of plant derived silica, depleted in heavier Si isotopes, during the spring snowmelt. Further, increased volumetric contribution from the headwater and losses of Si due to biogenic silica formation by diatoms in the subarctic lakes at a later period are expected to be responsible for the preferential losses of lighter isotopes. These conclusions are further verified by land cover analysis.

sted, utgiver, år, opplag, sider
2009. Vol. 73, nr 13, Suppl. S, s. A333-
Emneord [en]
Natural sciences - Earth sciences
Emneord [sv]
Naturvetenskap - Geovetenskap
HSV kategori
Forskningsprogram
Landskapsekologi; Tillämpad geologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-35127Lokal ID: 98861550-7daa-11de-8da0-000ea68e967bOAI: oai:DiVA.org:ltu-35127DiVA, id: diva2:1008379
Konferanse
Annual V.M. Goldschmidt Conference : 21/06/2009 - 26/06/2009
Merknad
Godkänd; 2009; 20090731 (ysko)Tilgjengelig fra: 2016-09-30 Laget: 2016-09-30 Sist oppdatert: 2018-02-26bibliografisk kontrollert

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Engström, EmmaRodushkin, IlyaIngri, JohanBaxter, DouglasEcke, FraukeÖsterlund, HeleneÖhlander, Björn

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