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Gewählte Master / Diploma Thesis:

Verena Morawetz (2008): Produktion und Keimfähigkeit von Diasporen ausgewählter Arten der Halbtrockenrasen im Lainzer Tiergarten.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 173. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The species-rich hey meadows in the Lainzer Tiergarten are designated as nature reserve, Natura 2000-area and they are also designated as part of the UNESCO-biosphere reserve Wienerwald. In our project we studied the seed production of selected species to come up with a guess on the relevancy of sexual reproduction in nutrient poor meadows and different cutting regimes. Additionally we tested the germination rates of the seeds produced. Field work was done between April and October 2006. 23 dominant and characteristic species were selected. After counting we tested the germination rates of seeds for all species by growing them under standard greenhouse conditions. When testing for seed production under different cutting regimes, we found the highest numbers of seeds per individual on subplots that had been abandoned for 7 years. There was a significant decrease in seed production per individual with increasing cutting frequency: Subplots that were cut every second year produced lower numbers of seeds per individual and the lowest numbers were found on the standard subplots cut once every year. Interestingly, the germination rates (as an indicator for reproductive success) were lowest for seeds collected from individuals of the abandonment treatment and increased with cutting frequency. Obviously, the subpopulation of meadow plants that were cut every year produced fewer seeds but gave them higher disposition to germinate. On the other hand, individuals of the same species growing on the gradually more abandoned subplots did not suffer from biomass loss but made stranded investments, which means they produced significantly higher numbers of seeds of lower quality (measured by germination ability).

Beurteilende(r): Karrer Gerhard

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