The graduation thesis is a result of the analysis of 40 research plots in the area of forest regional unit of Kras. The aim was to study the site productivity of thermophilic deciduous tree species. Research plots were fullymeasured and the social structure and crown characteristics were also estimated. Site strata were formed on the basis of phytosociologis relevés. For the five thickest trees on the plot, the height was measured and samples of increment core were taken from them to determine age and to analyse the correlation between ring widths and climate factors. Analyses have shown notice able negative correlation with temperature in the vegetation period, especially in the summer months. Analyses have also shown very weak positive correlation with the rainfall amount, noticeable only in July. In the end, site productivity was also determined. The sessile oak has the highest average site productivity (5,74 m3ha-1year-1), followed closely by the Turkey oak (5,69 m3ha-1year-1). These were followed by the European hop hornbeam (3,15 m3ha-1year-1, the pubescent oak (2,72 m3ha-1year-1) and the oriental hornbeam (2,30 m3ha-1leto-1 ).
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