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Vliv klimatu na radiální přírůst smrku ztepilého na vybraných lokalitách Jeseníků
Majerko, Jaroslav
The main objective of this bachelor thesis was to determine the influence of climate on the radial growth of Norway spruce (Picea abies) in selected locations of the Jeseníky Mountains. The samples (160 in total) were collected at four different localities using the Pressler borer, and dendrochronological analysis was performed with the PAST 32 programme. Tree ring curves were detrended, autocorrelation was removed and the regional standard tree-ring chronology and the regional residual tree-ring chronology were created. The ARSTAN programe was used to remove the age trend of tree ring curves and to create a residual index standard chronology. This created a residual chronology used for modeling the impact of climatic parameters on the radial increment in the program DendroClim. At the same time an analysis of significant negative years was performed. The average tree ring curve from the different sites have high similarities, and shows that radial increment statistically and significantly correlated with temperature from March to July and with soil moisture from March to May of the same year. The most significant negative years, which responded to more than 40% of all trees, were 1974, 1980, 1984 and in 2003. These negative significant years were cause by a low rate of monthly rainfall and increasing average temperatures during the growing season.
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Sestavení recentní dubové standardní letokruhové chronologie pro severní Moravu
Bužek, Stanislav
Theme and purpose of this diploma thesis was to compile a recent oak standard chronology for the region of Northern Moravia and to perform a dendroclimatological analysis. At three locations within the region of Northern Moravia, 195 samples from recent oaks have been collected using the Pressler increment borer. Tree-ring widths have been measured and processed in PAST 32 programme. From well-correlated tree-ring curves, a standard chronology has been successfully established with the range from 1895 to 2015. Removal of age-related trend from tree-ring curves and creation of residual standard index oak chronology has been performed in ARSTAN programme. Resulted residual chronology was used for modelling an impact of climatic variables on the radial increment in DendroClim programme, whilst also an analysis of significant negative years has been performed. Radial increment showed statistical and significant positive correlation with rainfalls occurred in last September and in March of this year. Thickness increment indicates statistically negative correlation with Palmer Drought Severity Index (PDSI) from April to August last year. The most significant negative years for radial increment, when more than 60% of all trees responded, were the following years: 1941, 1942, 1943, 1956, and 1998. These most significant negative years were caused by a lower rate of monthly rainfall accumulations and low temperatures during the growing season.
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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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Vliv klimatu na radiální přírůst smrku ztepilého na vybraných lokalitách Jeseníků
Majerko, Jaroslav
The main objective of this bachelor thesis was to determine the influence of climate on the radial growth of Norway spruce (Picea abies) in selected locations of the Jeseníky Mountains. The samples (160 in total) were collected at four different localities using the Pressler borer, and dendrochronological analysis was performed with the PAST 32 programme. Tree ring curves were detrended, autocorrelation was removed and the regional standard tree-ring chronology and the regional residual tree-ring chronology were created. The ARSTAN programe was used to remove the age trend of tree ring curves and to create a residual index standard chronology. This created a residual chronology used for modeling the impact of climatic parameters on the radial increment in the program DendroClim. At the same time an analysis of significant negative years was performed. The average tree ring curve from the different sites have high similarities, and shows that radial increment statistically and significantly correlated with temperature from March to July and with soil moisture from March to May of the same year. The most significant negative years, which responded to more than 40% of all trees, were 1974, 1980, 1984 and in 2003. These negative significant years were cause by a low rate of monthly rainfall and increasing average temperatures during the growing season.
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Klimatický signál v letokruhových chronologiích borovice kleče
Samusevich, Alina ; Treml, Václav (advisor) ; Vejpustková, Monika (referee)
Pinus mugo Turra (sensu lato) is a prostrate shrub growing above the alpine timberline in the mountain ranges of Southern, Central and Eastern Europe. It is well adapted to the harsh alpine environment creating different mechanisms for survival. The research was carried out in Krkonoše Mountains on base of Pinus mugo individuals compared with Picea abies trees. Samples from shrubs were gathered using serial sectioning from four sites in different elevations located on Sněžka Mountain and Smogornia Ridge. Further analysis of the sampled material was made with the help of different detrending methods to see which method will return the best growth response to climate parameters. RCS detrending and detrending via simple averaging reflected the best climate signal contained in dwarf pine chronologies. The advantage of these methods is based on their ability to reflect growth conditions of the particular site. Upper sites showed significant correlations with temperatures of the growing season, while on lower sites the signal was quite unclear. The amount of precipitation plays the significant role on shrub growth during the vegetation period (especially July month) and early spring when water is very important for growth initiation. Upper Pinus mugo sites showed high sensitivity to droughts, especially...
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