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Phosphorus dynamics...
Phosphorus dynamics in shallow eutrophic lakes : an example from Zeekoevlei, South Africa
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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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- Val Klump, J. (författare)
- Department of Biological Sciences and Department of Geosciences, Great Lakes WATER Institute, University of Wisconsin-Milwaukee, Milwaukee, USA
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- Ranjan, Rajesh Kumar (författare)
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
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(creator_code:org_t)
- 2008-10-18
- 2009
- Engelska.
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Ingår i: Hydrobiologia. - : Springer Science and Business Media LLC. - 0018-8158 .- 1573-5117. ; 619, s. 55-66
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Zeekoevlei is the largest freshwater lake in South Africa and has been suffering from hyper-eutrophic conditions since last few decades. We have used total P (TP), dissolved phosphate (PO4 (3-)), organic P (OP), calcium (Ca) and iron (Fe) bound P fractions to investigate the relevant physical, chemical and biological processes responsible for sedimentation and retention of P and to study phosphorus (P) dynamics in this shallow lake. In addition, redox proxies (V/Cr and Th/U ratios) are used to study the prevailing redox conditions in sediments. Adsorption by CaCO3 and planktonic assimilation of P are found to control P sedimentation in Zeekoevlei. Low concentration of the labile OP fraction in surface sediments restricts the release of P by bacterial remineralisation. Low molar Ca/P and Fe/P ratios indicate low P retention capacity of sediments, and P is most likely released by desorption from wind-induced resuspended sediments and mixing of pore water with the overlying water column.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Phosphorus
- Primary productivity
- Lake
- Sediment
- Dredging
- Chemistry
- Kemi
- Earth sciences
- Geovetenskap
- NATURAL SCIENCES
- NATURVETENSKAP
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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