Using dendrometers for measuring a radial increment of trees is efficient not only for investigation into the dynamics of the increment but also for changes in the tree stem in general, for a physiological condition of trees during certain periods of time, reliance on meteorological conditions and for tree-ring formation studies. The conducted research has applied to high resolution DRL 26 dendrometers that helped with identifying and distinguishing the impacts of climatic factors on the physiology and growth of trees. Also, the performed investigation assisted in assessing the impact of microclimate conditions on changes in tree stems. The location for installing dendrometers was selected with reference to the criteria such as representative research location, the degree of violation assessment, equal distribution of research sites in Lithuania and the estimation of climatic, hydrologic and anthropogenic conditions. Considering the above mentioned criteria, three raised bogs in which temperature, automatic water level devices in wells and dendrometers installed in measurement areas were chosen. The research period lasted from the end of the vegetation period to the beginning of dormancy season. For research purposes, 5 growing Scots pines (Pinus sylvestris) were used for examining changes in the stem volume. Another objective was to find out how stems were affected by growing in bog surroundings and to analyse the synchronicity of volume changes between trees. The conducted research disclosed specific features of the dynamics of changes in the stem volume at the end of vegetation, and the beginning of dormancy season was found.

Article in: Lithuanian

Article published: 2014-10-24