Criteria for selecting plus trees for protective forestry

Protective forest strips are the basis of environmental frame on sparsely wooded areas. To create such highly productive objects, selection corresponding gene pool is required. Plus trees representatives this pool. The aim research to develop criteria for highlighting plus protective forestry, focused creation plantings, main parameter which working height. 16 trial areas cherry oak (Quércus róbur L.), black locust (Robinia Pseudoacia green ash ( Fraxinus lanceolata B. ), European excelsior L. thorney Gleditschia triacanthos walnut (Juglans regia L.) have been laid out. A continuous recalculation heights in 100–142 individuals recalculated each area and their statistical indicators determined. height had a normal or close it distribution at studied objects. Data processing was carried out using Stadia 8.0/Prof licensed program Windows. method selecting has proposed, should exceed average one by 25% more. comparison proposed well -known revealed that can increase breeding differential with instrumental 48,25–53,78%, eye-instrumental 31,15–41,39%. Criteria various categories developed. Due different conditions, recommended highlight separately extreme mid-protective strips. With inventory, also necessary take into account sanitary condition trees.