The significance of sedimentation and sediments to phytoplankton growth in drinking-water reservoirs

Uhlmajnn, D. and Horn, H. (1992) The significance of sedimentation and sediments to phytoplankton growth in drinking-water reservoirs. In: Sutcliffe, David W. and Jones, J. Gwynfryn (eds.) Eutrophication: research and application to water supply. Ambleside, UK, Freshwater Biological Association, pp. 94-106. (FBA Special Publications,3)

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Abstract

In the mesotrophic-eutrophic Saidenbach Reservoir in Saxony, the nanoplankton and cyanobacteria have increased at the expense of diatom dominance, due to a doubling of the external phosphorus load in the last 15 years. However, the phosphorus sedimentation flux is still very high (up to 80% of the input), corresponding to more than 2 g m2 d-1 in terms of dry weight. There is a strong correlation between the abundance of diatoms in the euphotic zone and their sedimentation flux (with a delay of about 2 weeks). Only about 25% of the deposited material could be clearly attributed to plankton biomass; the remainder resulted from flocculation and precipitation processes or directly from the inflow of clay minerals. The ash content of the deposited material was high (73%). Thus the sedimentation flux can be considered to operate as an internal water-treatment/oligotrophication process within the lake. The neighbouring Neunzehnhain Reservoir still has a very clear water with a transparency up to 18 m depth. Though the sediment was not much lower than Saidenbach sediment in total phosphorus and total numbers of bacteria, sulphide was always absent and the ratio of Fe 2+ to Fe 3+ was very low in the upper (0- 5 cm) layer. Thus the external and internal phosphorus loads do not attain the critical level necessary to induce a ”phosphorus - phytoplankton” feedback loop.

Item Type: Book Section
Title: The significance of sedimentation and sediments to phytoplankton growth in drinking-water reservoirs
Personal Creator/Author:
CreatorsEmail
Uhlmajnn, D.
Horn, H.
Title of Book: Eutrophication: research and application to water supply
Editors:
EditorsEmail
Sutcliffe, David W.
Jones, J. Gwynfryn
Refereed: No
Series Name: FBA Special Publications
Volume: 3
Page Range: pp. 94-106
Date: 1992
Publisher: Freshwater Biological Association
Place of Publication: Ambleside, UK
ISBN: 978-0900386-52-7
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: Eutrophication; Freshwater lakes; Water quality control; Phosphorus; Water reservoirs; Phytoplankton; Growth; Sedimentation; Sediment composition; Germany
Subjects: Ecology
Limnology
Pollution
Item ID: 5290
Depositing User: Hardy B Schwamm
Date Deposited: 09 May 2011 20:00
Last Modified: 29 Sep 2011 15:08
URI: http://aquaticcommons.org/id/eprint/5290

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