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Non-detrital Si concentrations as an estimate of diatom concentrations in lake sediments and suspended material
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-2276-0564
Luleå tekniska universitet.
2001 (English)In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 177, no 3-4, p. 229-239Article in journal (Refereed) Published
Abstract [en]

This paper evaluates a method, based on normalization with Al, to estimate the concentration of diatoms in suspended and deposited sediments. Provided that Al exists primarily in the detrital phase, one can calculate the fraction of non-detrital Si (i.e. biogenic Si). Suspended matter and sediment in two lakes in northern Sweden have been analyzed. Results from the normalization method are compared with microscope count data. The results from the two methods differ somewhat. Partly dissolved diatom frustules may explain part of this discrepancy. These remnants can hardly be recognized as diatoms. Therefore, they are not counted during the microscopic analysis, although they contribute to the concentration of biogenic Si. Another factor is the differences in Si content among different types of diatoms. We show that the calculated concentrations of non-detrital Si are good estimates of the diatom concentrations. By using normalization as a tool, reasonable estimates of the stocks of biogenic Si can be obtained rapidly. Using these estimates as a guide, sites where considerable changes in diatom productivity and/or dissolution rates have occurred can be identified.

Place, publisher, year, edition, pages
2001. Vol. 177, no 3-4, p. 229-239
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-7344DOI: 10.1016/S0009-2541(00)00378-8Local ID: 5b7b4f20-a8bf-11dc-9057-000ea68e967bOAI: oai:DiVA.org:ltu-7344DiVA: diva2:980233
Note

Validerad; 2001; 20071212 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-15Bibliographically approved

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