The diploma thesis is focused on clarifying the effects of climatic conditions and intraspecific variability, which affect the physiological processes of woody plants. Evaluates the variability of physiological features of individual populations of beech (Fagus sylvatica) and identifies differences between populations and their adaptation in the conditions of the experimental area Vrchdobroč. In the early 1990s, beech forests from all surrounding countries were planted at the Vrchdobroč locality, except for the Balkans and Italy. Production and morphological characteristics were evaluated on samples of branches taken in 2017. The strongest linear relationship was found for resistance to cavitations P50 and Ellenberg quotient at the place of origin (R2 = 0.42), further for the specific leaf area SLA in relation to the Ellenberg quotient and the aridity index (R2 = 0.77 and 0.73, respectively). As the amount of precipitation at the place of origin decreased, the resistance to cavitation increased and the SLA decreased. We also confirmed the relationship between the total number of vessels and the aridity index (R2 = 0.43), with individuals from drier areas forming a larger number of vessels. The relationship between growth parameters and climate at the place of origin was significantly weaker. In the future, it is definitely necessary to know the functioning of various mechanisms of resistance to stress factors. This can be the key to mitigating the effects of climate change on forests.