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Elemental (C, N, H ...
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Das, Supriyo KumarStockholms universitet,Institutionen för geologi och geokemi,Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden
(författare)
Elemental (C, N, H and P) and stable isotope (delta N-15 and delta C-13) signatures in sediments from Zeekoevlei, South Africa : a record of human intervention in the lake
- Artikel/kapitelEngelska2008
Förlag, utgivningsår, omfång ...
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2007-06-06
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Springer Science and Business Media LLC,2008
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:su-59148
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-59148URI
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https://doi.org/10.1007/s10933-007-9110-5DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-151436URI
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Språk:engelska
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Sammanfattning på:engelska
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Klassifikation
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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authorCount :4
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We used elemental carbon, nitrogen, phosphorus and hydrogen ratios (C/N, N/P and H/C) with total organic carbon (TOC) and total phosphorus (TP) as well as stable carbon and nitrogen isotopes (delta C-13 and delta N-15) to investigate the source and depositional conditions of organic matter in sediments from Zeekoevlei, the largest freshwater lake in South Africa. Typical C/N (10-12), H/C ratios (>= 1.7) and delta C-13(organic) values (-22 to -19 parts per thousand) together with the increase in TOC concentration indicate elevated primary productivity in lower middle (18-22 cm) and top (0-8 cm) sections of the sediment cores. Seepage of nutrients from a nearby waste water treatment plant, rapid urbanization and heavily fertilized farming in the catchments are responsible for the increased productivity. Consistent with this, measured delta(15) N-organic values (similar to 11) indicate increased raw sewage input towards the top-section of the core. Although cyanobacterial blooms are evident from the low delta N-15 values (similar to 3 parts per thousand) in mid-section of the core, they did not outnumber the phytoplankton population. Low N/P ratio (similar to 0) and high TP (100-2,200 mg l(-1)) support cyanobacterial growth under N limited condition, and insignificant input of macrophytes towards the organic matter pool. Dredging in 1983, caused sub-aerial exposure of the suspended and surface sediments, and affected organic matter preservation in the upper mid-section (12-14 cm) of the core.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Routh, Joyanto,1968-Stockholms universitet,Institutionen för geologi och geokemi,Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden(Swepub:liu)joyro37
(författare)
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Roychoudhury, Alakendra N.Department of Geological Sciences, University of Cape Town, Rondebosch, South Africa
(författare)
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Klump, J. ValDepartment of Biological Sciences and Department of Geosciences, Great Lakes WATER Institute, University of Wisconsin-Milwaukee, Milwaukee, USA
(författare)
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Stockholms universitetInstitutionen för geologi och geokemi
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Paleolimnology: Springer Science and Business Media LLC39:3, s. 349-3600921-27281573-0417
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