This research aimed to determine the variability of the part of the sessile oak gene pool from the area of the Natural Monument ?Kosutnjak Forest? at the level of one- and two-year-old seedlings, in the progeny test established in the nursery of the Faculty of Forestry. The research was conducted with one-year-old and two-year-old seedlings of 10 half-sib lines of the sessile oak. The heights and root collar diameters were measured, and the survival of the seedlings at the end of the second growth period, as well as the annual height and diameter growth, were determined. The results of descriptive statistics, one-way analysis of variance and Fisher?s least significant differences test, as well as multivariate analyzes - cluster and analysis of the main components were also presented in the research. The obtained results indicate a satisfactory level of genetic variability, which represents a good starting point for the realization of ex situ conservation of part of the gene pool, by establishing a field trial in the area of Kosutnjak and/or by introducing seedlings in smaller or larger groups to this area. In this way, part of the gene pool of the starting population, represented by seedlings of different half-sib lines, is permanently preserved, the number of the starting population increases, and conditions are created for continuous scientific and research work.
Black poplar (Popuius nigra L.) belongs to endangered species of Serbia that grow in wetlands. This research was conducted on the Great War Island, which is located at the confluence of the Sava and Danube rivers, in Belgrade. This research aimed to determine the survival rate and growth dynamics of seedlings of different black poplar clones in the first year after planting in the flood conditions of the Great War Island. Recording of surviving seedlings and measurements of heights and diameters were performed in 2019, firstly in the spring (April IB, 2019), the second time during the summer (July IS, 2019), after the flooding period, and the third time in the autumn (October 4,2019), at the end of the vegetation period. The results of descriptive statistics, one-way analysis of variance (One-Way ANOVA), and cluster analysis are presented in this paper. Based on the obtained results, the highest survival rate after the flooding period was recorded in clone number 9 (85.70%), in which 78.60% of seedlings survived at the end of the vegetation period. It can be stated that the seedlings of black poplar clone number 9, based on a high survival rate, have the potential to be used for afforestation of wetlands, such as the Great War Island. However, the seedlings of this clone showed significantly lower values of measured heights and diameters, compared to the seedlings of most clones and mostly the seedlings were damaged. On the other hand, seedlings of clone 3 were superior based on the mean values of heights and diameters, obtained after the measurements in all three periods, including the period after flooding. Seedlings of this clone had a satisfactory survival rate, but it was constantly declining. Clone number 1 showed the lowest results, both in terms of survival at the end of the vegetation period and in terms of mean heights and diameters of seedlings. When using this species, special attention should be paid to preserving the gene pool and avoiding the establishment of commercial monoclonal plantations, especially in protected areas such as the Landscape of Outstanding Features "Great War Island".
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