On the basis of the standard techniques the pedigree structure of forest stands and distribution of trees on diameter of climax darkconiferous stands of the Vishera national Nature Reserve located in the northeast of Perm District (Northern Urals) is studied and analysed. It is established that the wood layer of the explored climax darkconiferous forests of Northern Urals has multispecies structure. At domination of a spruce fir and the fir (up to 5 units) and, substantially a birch and, also participates, the cedar. In type of the wood Firspruce fernytallgrass as the as a part of a forest stand there is a rowan. Both lowproductive, and highly productive forest stands are formed. In a structure of forest stands of the darkconiferos woods of Vishera Nature Reserve the considerable variation of trees on diameter caused both by forest vegetation conditions of plantings, and influence of negative natural factors the periodic local fires and a windfall is revealed. Distribution of trees on diameter in forest stands, except for postwindfall, is well approximated by the equations of the 2nd order. Distribution of trees on diameter in postwindfall darkconiferous community is best of all described by the equation of the 4th order. The considerable righthand asymmetry of distribution of trees on diameter for all studied forest stands, and, in particular, the affected local fires or a windfall is noted. Such distribution of trees on diameter classes of a trunk reflects processes of natural renewal and development of forest stands, long on time. The revealed features of distribution of trees on pedigree structure and of diameter classes in the studied radical forest stands demonstrate that even in the conditions of influence of negative natural factors processes of natural renewal in general, provide maintenance of multispecies structure of radical plantings. However, impact of the periodic local fires negatively affects renewal of a cedar.
THE NATIONAL NATURE RESERVE HRONCECKY GRUN (THE SLOVAK REPUBLIC) � STATE AND DEVELOPMENT OF THE FOREST STANDS
