WFRF:(Klump J. Val)
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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
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- Das, Supriyo Kumar (författare)
- Stockholms universitet,Institutionen för geologi och geokemi,Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden
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- Routh, Joyanto, 1968- (författare)
- Stockholms universitet,Institutionen för geologi och geokemi,Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden
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- Roychoudhury, Alakendra N. (författare)
- Department of Geological Sciences, University of Cape Town, Rondebosch, South Africa
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- (creator_code:org_t)
- 2007-06-06
- 2008
- Engelska.
- Ingår i: Journal of Paleolimnology. - : Springer Science and Business Media LLC. - 0921-2728 .- 1573-0417. ; 39:3, s. 349-360
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- isotopes
- carbon
- nitrogen
- ratios
- organic matter
- eutrophication
- Earth sciences
- Geovetenskap
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- ref (ämneskategori)
- art (ämneskategori)
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