Ecke, Frauke
- Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
- Luleå Tekniska Universitet
Sammanfattning
The results implicate biogeochemical Si-cycling via formation and dissolution of biogenic silica as processes significantly affecting the dissolved Si transport in boreal systems during April to early October. The Si budget in the river system appeared to be controlled by relative Si enrichment during high discharge events and relative Si depletions in the subarctic mountainous and lake dominated areas. The Si enrichments and depletions were accompanied by decreasing and increasing riverine delta(29)Si and delta(30)Si, respectively. 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 dissolved 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, as further verified by land cover analysis. (C) 2010 Elsevier By. All rights reserved.
Nyckelord
Silicon isotopic composition; Dissolved Si; Biogenic silica; Subarctic river system; Biogeochemical Si cycle; MC-ICPMS
Publicerad i
Chemical Geology
2010, volym: 271, nummer: 3-4, sidor: 142-152
Utgivare: ELSEVIER SCIENCE BV
SLU författare
Globala målen (SDG)
UKÄ forskningsämne
Ekologi
Publikationens identifierare
- DOI: https://doi.org/10.1016/j.chemgeo.2010.01.005
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/39996