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Biogeochemistry of shallow lake sediments: a case study from Verlorenvlei, South Africa
Presidency University, India.
Linköping University, The Tema Institute, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
University of Stellenbosch, South Africa.
2015 (English)In: Current Science, ISSN 0011-3891, Vol. 109, no 8, 1486-1491 p.Article in journal (Refereed) Published
Abstract [en]

Studying the biogeochemistry of shallow lake sediments, especially the source of sedimentary organic matter (OM), is challenging because of the low preservation of OM in shallow lake sediments. Here we report the source of sedimentary OM in a shallow freshwater lake, Verlorenvlei, in South Africa using a number of biogeochemical proxies. Elemental carbon and nitrogen ratio (C/N), and stable C and N isotopes (delta C-13 and delta N-15) indicate algal source of the sedimentary OM. Total organic and inorganic C, different phosphorus fractions, delta C-13 and delta N-15 values indicate repetitive presence of non-N-fixing cyanobacteria under moderate N-limited conditions. Cyanobacterial population in Verlorenvlei is likely influenced by the availability of dissolved inorganic C. Cyanobacterial proliferation in the lake has ceased with accelerated N input as recorded at the top of the core.

Place, publisher, year, edition, pages
INDIAN ACAD SCIENCES , 2015. Vol. 109, no 8, 1486-1491 p.
Keyword [en]
Carbon; cyanobacteria; nitrogen; organic phosphorus; shallow lakes; stable isotopes
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:liu:diva-123071ISI: 000363970700029OAI: oai:DiVA.org:liu-123071DiVA: diva2:876579
Note

Funding Agencies|SMF

Available from: 2015-12-04 Created: 2015-12-03 Last updated: 2017-12-01

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