Ecological-geographical structure of mountain boreal forests in Siberia and problems of small-scale mapping

Moscow state university, Moscow, 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 complex natural differentiation of the mountains and, primarily , in the altitudinal zonal distribution of plant communities. The Siberian Mountains are distinguished by 27 altitudinal zonality types, 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 subgoltzy belts. Within the limits of a high-altitude belt boreal forests form complex combinations of forest associations (or various syntaxa), 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 as review maps. The legend of the Circumboreal Vegetation Map based on an ecological-geographical principle may be more informative to show the diversity of boreal forests in the mountains of the Siberia.

© 2012 Organizing Committee