In the master's thesis, the success of sowing in different positions of six experimental canopy gaps in a high-mountain Norway spruce forest is presented. The gaps were the size of 0.25 ha, the positions of the plots were arranged according to the four main directions of the compass, the center of the gap and under the canopy. In 2018, the seeds of various tree species were sown, and the light and slope inclination were recorded. The first seedling count was performed in spring 2019 and the second was performed the following spring. The development of seedlings was related with the variability of the microclimate, atmosphere, soil conditions and micro-relief. The results showed that sowing success depended mainly on tree species, slope inclination, and light. The most successful species in terms of survival rate were fir (100%) and beech (88%). Both thrived better at the gap edges where there is less light. A distinct negative effect of inclination was noticed for beech, as it was the case with larch, except that the latter also required more light. Spruce was for unknown reason, the only species that developed relatively well in the gap center. Seed predators have been an important inhibitor of the survival of all species, especially beech and oak. Douglas fir, like most species, had problems with the slope inclination and competition of ground vegetation. Research has indicated some guidelines to improve the sowing success.
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