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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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Vliv klimatu na radiální přírůst smrku ztepilého na vybraných lokalitách Beskyd
Filák, Jiří
The influence of climate on the growth of trees is a very important issue with respect to the climate change. Norway spruce (Picea abies (L.) Karst.) is a main grown tree species in the Beskid Mts., and therefore, it is necessary to monitor the causes of changes in its radial increment. The aim of this work was to determine the influence of the selected climate factors on radial growth of Norway spruce. Samples for analysis were taken using Pressler increment borer at nine stands between 549 and 950 m above sea level across the Silesian and the Moravian-Silesian Beskids. Standard dendrochronological methodology was used to measure tree-ring widths, cross-dating, the creation of tree-ring chronologies and modelling dependence of radial growth on climate factors for the period 1961-2014. Well replicated regional tree-ring chronology shows the narrowest tree-ring widths in 1980, 1993, 2003 and 2006 when more than 40% of trees responded negatively. Radial growth statistically significant positive correlates mainly with temperatures and effective global radiation in the period March-May of the current year. Precipitation has positive effect on the radial growth during the previous growing season and in addition in June of the current year. The relative availability of water in the soil has negative effect on tree-ring width in April of the current year. Moreover, moving correlations shows increasing negative effect of temperature and positive effect of soil moisture and precipitation. The results present that climate change probably lead to necessary forest adaptation measures.
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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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