University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Bernhard Traxler
(2016):
Jahrringchronologien aus dem Waldviertel.
Master / Diploma Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe,
BOKU-Universität für Bodenkultur,
pp 70.
UB BOKU
obvsg
- Abstract:
- Due to the annual climatic rhythm trees form rings and at favourable growth conditions they tend to be wider, while at inferior climatic conditions they are smaller. Trees growing in a region show similar growth characteristics, expressed with sequences of smaller and wider rings. In this work, regional tree-ring chronologies for the species spruce, fir and pine are established. To achieve this, altogether 42 historic objects (mostly churches) as well as 5 forest sites were sampled, collecting 1141 individual samples that are prepared for measurement and further assessment. All tree-ring widths were digitally recorded, and assessed with special software. The established tree-ring sequences were visually and statistically compared (“cross-dated”) with reference chronologies. Through synchronisation it was possible to date all samples absolutely, determining also the exact felling date. My means of the dated curves individual regional chronologies could be established for all tree species. The species fir allocates a time period from 1214 to 2014 AD, which was also the longest chronology of this study covering 801 years. Spruce covered the period between 1354- 2014 AD, and pine bridged 1498- 2014 AD. The establishment of regional chronologies generated the basis for numerous dendrochronological research questions such as determining the age of historical buildings. The chronologies are also instrumental for many climatic and ecological issues. Another part of this work was dealing with the method of dendroprovenancing. In addition to precise age determination of wooden elements, dendroprovenancing can determine their geographic origin. As expected, it is shown that local wood was used to set up the historical buildings within the Waldviertel region.
- Beurteilende(r): Wimmer Rupert
- 1.Mitwirkender: Grabner Michael