This thesis presents that certain parameters have been used to determine which tree species would be suitable for transformation of low productivity karst forests. In the first year after planting were checked the survival rates of seedlings, seedling height, and their increment and vitality. In the year 2012 six research plots of sizes 45 % 80 m were based near the town Divača. Experimentally, they planted seedlings of six tree species: European nettle tree (Celtis australis L.), sessile oak (Quercus petraea (Matt.) Liebl.), common beech (Fagus sylvatica L.), wild cherry (Prunus avium L.), common walnut (Juglans regia L.) and sycamore (Acer pseudoplatanus L.). The largest proportion of survival at all six plots was found with wild cherry (95%), common walnut (92 %) and European nettle tree (91%). Common beech and sycamore showed a worse growth, since the survival rate compared with successful tree species was 20 % lower. The quality of seedlings and the site quality had a major impact on survival, increment, height and vitality of seedlings.
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