Stability of spruce trees with different types of branching in condition of Prikamye forest

The investigations have been carried out in coniferous-broad leaved (mixed) forests in the southern part of Permsky kray. There was determined spruce trees stability to drying in the process of working on sampling areas category of sanitary condition and selection form for all spruce trees according to branching type, on the base of 9 sampling areas data laid in spruce stands of greenish, sorrel and lime forest types in Prikamye. There has been determined that trees of comb-shaped (under 71.12 % on the sampling area 13) and planar (under 70.4 % on the sampling area 15) crown shape prevail in stands of all the inspected forest types. However, there are occurring the samples of all classes of condition state the trees of all the above mentioned types of branching. Spruce trees with brush type of branching are characterized by the least occurrence (to 20.4 % on the sampling area 14). Branching type of the trees mentioned above don't occur in lime spruce stands. There are revealed mainly trees of the first 3 categories of sanitary condition among the spruce trees of branching brush type. All of the trees with the specified type of branching were healthy on sampling areas 4 and 13. The latter testifies to retour high stability of spruce trees with branching brush type as compared with comb-shaped and planar crown type branching type. The conclusion of heightened stability to brush type of tree branching should be considered untimely because of limited available data. Investigations in this direction need to continue.