In the research, we carried out artificial regeneration with transplanted seedlings of three types of oak: sessile oak, turkey oak and downy oak in different predominantly beech habitats. The purpose of the method was to determine whether tree species originating from different climates than the planting sites will ensure successful restoration of forests with the possibility of adaptation. In addition, we were interested in whether the proportion of surviving oak seedlings would be higher on better sites. The work method was divided into three phases: 1.) Selection of seed stands (source of transplanted seedlings), 2.) Pulling and planting and 3.) Performing the first measurement. We pulled 300 seedlings of each tree species. The planting of the seedlings took place in three locations: on Vrhnika above, Vrhnika below and in Golišče. We planted on plots in the shape of a triangle of size 2 × 2 × 2 m. Inside each triangle we planted 10 seedlings of each species. Each triangle contained 30 oak seedlings. At each location, we made 10 triangles so that each location had a total of 300 transplaneted seedlings – 100 sessile oak, 100 turkey oak and 100 downy oak. Measurements of plots and seedlings were made within the QGIS package. Data processing took place in Microsoft Office Excel, JASP and R program. The measurements showed that more than half of all the transplanted seedlings survived in the first growing season after planting. Turkey oak and sessile oak were the most successful in terms of survival and growth, while downy oak was significantly less successful. The conditions for the survival and growth of all transplanted seedlings were the best on Vrhnika below. Survival rate was the worst on Vrhnika above and growth conditions were worst in Golišče. Also, we were unable to prove that the survival rate of transplanted seedlings is higher in better habitats for neither of the tree species.
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