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Gewählte Master / Diploma Thesis:

Bernd Kaimbacher (2007): Wurzelcharakteristika und Wasserverbrauch unterschiedlicher Fruchtarten als Zwischenfrucht für die Sommer-, Herbst- und Winterbegründung im semiariden Produktionsraum.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 112. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The use of cover crops is traditionally focused on the reduction of nitrate leaching and soil erosion. The rooting characteristics of plants are essential for their influences on soil physical and hydrological processes. The objectives of the present work are to compare several root parameters of cover crops from different plant families and to provide estimates on water consumption of the cover crops. The work is based on a one year field study established on an experimental field in Hollabrunn, (semiarid part of Lower Austria). The rooting patterns of four different cover crops (Phacelia tanacetifolia, Sinapis alba, Secale cereale, Vicia villosa) were investigated. Root sampling was done at the end of the vegetation period. Sampling depth was 40 cm where major root effects on soil physical properties were expected. The samples were divided in three sub-samples (0-10, 10-20 and 20-40 cm). In the laboratory, roots were analyzed for root length, surface area and root diameter. Aboveground biomass also was measured. Weather data for the estimation of cover crop transpiration were measured continuously by an automated weather station. Biomass was significantly higher for vetch than for the other species. The most intensive root growth in the main rooting zone was found for phacelia. The average root diameter of vetch was generally higher than for the other varieties. The distribution of root length reveals that 42 % of vetch is found in a diameter range between 0.25-0.50 mm. For all other crops, more than 60 % of the whole root length within fine roots are smaller than 0.25 mm in diameter. The coefficient of transpiration based on the obtained estimates was between 144.1 and 281.8 l kg-1. The obtained root data could provide a basis for further research of plant-soil interactions affecting soil structure and for use in physically based water uptake models in order to refine the knowledge on water losses on cover cropped fields.

Beurteilende(r): Liebhard Peter

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