Vergleichende Untersuchungen über den potentiellen Eintrag von Nährstoffen in den Wasserkörper von Talsperren durch Freisetzung aus dem Sediment

Microbial and chemical processes in the sediment of standing waters have a big influence on the release of nutrients and the trophic state. Due to the strong interactions between sediment and water body and the storage of materials sediments can be consulted as an important additional source of information for the evaluation of the trophic state and for the estimation of future trophic developments. Because of relatively small fluctuations the parameters in the sediment and pore water are well suitable for a trophic validation. Sediments and pore water of four reservoirs with different trophic characteristics were sampled in regular intervals (Neunzehnhain I - oligotrophic; Muldenberg - oligotrophic, dystrophic; Saidenbach - mesotroph; Quitzdorf - polytrophic). Many chemical and microbial parameters were examined regarding the trophic dependancy and the possibility for including these parameters into a trophic evaluation system. The concentrations of SRP, ammonium, and alkalinity in the pore water and the metal:phosphorus-quotient (Al:P, Fe:P) in the dry sediment showed the biggest trophic dependancy, so that these parameters are applicable for a sediment referred trophic assessment of standing waters. The polytrophic reservoir Quitzdorf has exhibited an extreme abundance of the cyanobacterium Microcystis for years. Investigations of the water body showed that apart from parameters like the water temperature the mass growth of Microcystis in the reservoir is obviously very strongly affected by the nitrogen:phosphorus-quotients in the water body. In laboratory experiments with sediments of this reservoir the phosphorus release from the sediment could be significantly lowered by the addition of aluminum and a part of the phosphorus could be shifted from the reductively soluble iron bound phosphorus fraction into the stable aluminum bound phosphorus fraction.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Technische Universität Dresden

Year

2003

Author dc:creator

• Maaßen, Sebastian

Contributors dc:contributor

• Röske, Isolde
• Uhlmann, Dietrich
• Stottmeister, Ulrich

• Microcystis
• Sediment
• Talsperren
• Trophiebewertun
• mikrobielle Prozesse
• microbial processes
• reservoirs
• trophic valuation