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Gewählte Master / Diploma Thesis:

Maximilian Thomas Johannes Behringer (2022): The Influence of Forest Site Preparation on Soil Functions of an Alluvial Forest in the Upper Rhine Valley, Vorarlberg.
Master / Diploma Thesis - Institut für Waldökologie (IFE), BOKU-Universität für Bodenkultur, pp 120. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Alluvial forests are changing drastically in their hydrological regime, vegetation composition and structure, and disturbance dynamics. Causes are river regulations, historic land use, recent forest management, and introduced species such as Solidago canadensis agg. or the pathogenic fungus Hymenoscyphus fraxineus causing ash dieback. Climate change increases the scale of these changes. As a result, pre-mature stands dominated by Pica abies or Fraxinus excelsior have to be clearcut. In order to achieve a tree species composition which is adapted to the altered site conditions and still economically desirable, tree planting in a larger scale is inevitable. To control competing vegetation site preparation (mulching and tilling of planting strips) was deemed to be necessary but is discussed controversially. Effects of site preparation on indicators for soil functions were compared for the two dominating soil types, Fluvisols and Rendzic Leptosols, using a chronosequence approach. The following key results were obtained: (1) Soil type has a significant effect upon most indicators. (2) Areas treated ≥5 years ago have significantly higher SOC stocks and a higher bulk density in the 20 cm topsoil. (3) Tilling strips have significantly lower SOC and Ntot-stocks (total N) compared to areas only mulched. (4) Effects of site preparation on C/N-ratio (-), ratio of microbial to organic carbon (+) and hydraulic conductivity estimated from pedotransfer functions (-) were mainly significant for Rendzic Leptosols. This may reflect the mobilization of accumulated forest floor, which was present in mature spruce stands on Rendzic Leptosols but not on Fluvisols. (5) The vegetation shows an expected response to clearing. Mulching effects could not be distinctly separated from clearing effects. (6) Nitrate concentrations in seepage are below drinking water standards and show no clear treatment effect, though highest values were found in declining spruce stands on Leptosols.

Beurteilende*r: Katzensteiner Klaus

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