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Radiální růst borovice kleče na horní hranici lesa v CHKO Jeseníky
Jakubcová, Vanda
This bachelor thesis deals with the study of the reaction of Dwarf pine to the climatic variables at the treeline ecotone. As a representative of the shrubs, the Dwarf pine (Pinus mugo Turra) was selected. At the site of Šerák-Keprník National Nature Reserve in the Protected Landscape Area of Jeseníky, wood discs from 32 individuals of Dwarf pine were taken. The discs surface were grinded and the tree ring widths were measured in the laboratory. The average age of Dwarf pine shrubs in a given location is between 70-80 years. Using 4 detrending methods (negative exponential, mean, friedman and RCS), the age trend was removed from tree ring series, and site chronology was created from the each type of detrending standardization. The resulting chronologies were correlated with climatic data (monthly temperatures, precipitation and Palmer's Drought Index) and the climate signal was analysed.. It was found that the diametr growth of Dwarf pine shrubs in a studied locality is mainly affected by the temperature during the growing season (May, June, July). The precipitation affects the growth of the Dwarf pine in the locality, especially in the autumn months (September, October). PDSI has a rather negative effect on the growth of the dwarf pine shrubs.
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