ИСТИНА

Vladivostok, Russia, 61. Место издания BGI FEB RAS Vladivostok, Russia Phytogeographic research in the mountains is connected with the development of the three-dimensional structure concept of vegetation cover. Integral manifestation of latitudinal and altitudinal zonal peculiarities of the vegetation distribution is typical for the mountains. The vegetation diversity is reflected in the compound natural differentiation of the mountains and, first of all, in altitudinal zonal distribution of plant communities. In the Siberian Mountains are distinguished 27 altitudinal zonality types, are united in 9 groups of the boreal class, reflecting the connection of mountain biota with zonal vegetation and biogeographical areas. The high-altitude belt is considered as a structural part of the type. The mountain taiga belt has geographic variations which are characterized by complex formations: the Ural-Siberian, Angaridian, Okhotian, Beringian complexes of vegetation formations. Boreal forests are composed of other high-altitude zones: forest-steppe, subtaiga, subalpine and subgoltsy belts. Within the limits of a high-altitude belt boreal forests form complex combinations of forest associations (or various syntaxons), or come in contact with other vegetation types, forming different specific vegetation structures (or territorial units: phytocatens, high-altitude series, exhibition combinations of phytocatens). The phytogeographic features structures, reflecting ecological and natural potential of ecotopes, depend on their position in biogeographical systems of the Siberian Mountains. These vegetation structures can be displayed on a small-scale map as autonomous units. There is an experience of a display of structural subdivisions of the boreal forest as chorological units at review maps. The legend of the Circum Boreal Vegetation Map based on an ecologic-geographical principle may be more informative to show the diversity of boreal forests in the mountains of the Siberia