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Gewählte Master / Diploma Thesis:

Maximilian Breiner (2016): Soil Aggregate Stability under different Soil Management Systems with Focus on the Influence of Roots.
Master / Diploma Thesis - Institut für Bodenforschung (IBF), BOKU-Universität für Bodenkultur, pp 53. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Tillage systems have manifest effects on the soil physical and biological environment. In agricultural systems various tillage practices are applied with different degrees of soil disturbance. Besides the economical advantages of alternative soil tillage systems they can help to improve soil health. This study aims at determining the impact of tillage systems of different intensity on the amount of stable aggregates, which are crucial for soil ecosystem services like regulation of erosion, carbon sequestration or water storage. Hence, four tillage systems of different intensity were compared, conventional tillage (CT) including moldboard plough, reduced tillage (RT), minimum tillage (MT) and no tillage (NT). Additionally, the influence of tillage on rhizosphere and bulk soil was investigated. Top soil samples were taken from 0-10 cm depth. Besides soil aggregate stability (SAS), biological parameters such as dissolved organic carbon (DOC), active microbial biomass, ergosterol (indicator for fungal biomass) and glomalin (soil protein), which are mainly responsible for the creation of stable aggregates, have also been measured. Extra samples were taken for the evaluation of mycorrhizal colonization among the treatments. RT, MT and NT systems destroyed fewer soil aggregates due to the lower energy impact. Also, lower tillage intensity increased DOC, active microbial biomass, ergosterol and glomalin levels. There were significant interactions (treatment vs. position) for DOC and ergosterol. The mycorrhizal colonization of roots neither correlated with the amount of ergosterol nor with measured glomalin values. DOC and glomalin had the highest correlation with SAS and thus seemed to be the most important biological factors for aggregation processes. The study shows that the reduction of tillage intensity significantly improves soil environmental parameters, such as stable aggregates, active microbial biomass, DOC and glomalin.

Beurteilende(r): Zechmeister-Boltenstern Sophie
1.Mitwirkender: Mentler Axel
2.Mitwirkender: Bodner Gernot

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