University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Edith Kamptner
(2014):
Einfluss verschiedener Bodenbearbeitungssysteme auf bodenphysikalische Eigenschaften im pannonischen Trockengebiet.
Master / Diploma Thesis - Institut für Bodenforschung (IBF),
BOKU-Universität für Bodenkultur,
pp 91.
UB BOKU
obvsg
FullText
- Abstract:
- During the last decades, reduced tillage practices gained in importance worldwide. On the one hand, this is due to economic reasons (less fuel and labour costs) on the other hand this is due to ecologic reasons (protection from erosion and evaporation, improvement of soil structure). This master thesis investigates the influence of three different soil tillage systems on the soil physical parameters as well as on soil organic carbon (SOC). The treatments include conventional tillage with mouldboard plough to 25-30 cm depth (CT), reduced tillage with cultivator to 15 cm depth (RT) and minimum tillage to 5-8 cm depth (MT). The investigated long-term field trial (since 1988) is located in the Marchfeld, which is part of the pannonic dry area with a mean annual temperature of 9,5 °C and a mean annual precipitation of 525 mm. In 2012, soil samples at five depths (2-7, 10-15, 15-20, 32-37 and 52-57 cm) were taken and analyzed in the laboratory. SOC-concentration at 0-15 cm depth was higher for MT than for RT and CT, in deeper soil layers CT had the highest SOC-concentration. Total SOC storage of the whole horizon was almost similar for all treatments. At 2-7 and 32-37 cm depth bulk density of MT was significantly lower than for RT and CT, in contrast bulk density of CT was significantly lower than for MT and RT at 15-20 cm depth. The water retention curve showed following trend: In the upper soil CT can retain more water than MT at low suction levels, in contrast MT can retain more water than CT at higher suction levels. In the upper soil MT shows a higher unsaturated hydraulic conductivity (Ku) than RT and CT at low suction levels, at 32-37 cm depth Ku of MT and RT is higher than that of CT over the whole suction range (0-15000 hPa). At 2-7 cm depth saturated hydraulic conductivity of MT is significantly higher than for RT and CT.
- Beurteilende(r): Rampazzo Nicola