Krestov P.V., Omelko A.M.
Proceedings of the Fifth International Workshop: Conservation of Arctic Flora and Fauna (CAFF) Flora Group. Circumboreal Vegetation Mapping (CBVM) Workshop, (Helsinki, Finland, November 3-6, 2008). Vol.21. Год: 2010 Страницы: 137-142Bioclimatic ranges of phytosociological units confirmed the biotemperature thresholds of major biogeographical zones found by Hamet-Ahti et al. (1974), Kira (1977), and Fang & Yoda (1990). The critical warmth index values of 15?C, 45?C, 55°C, and 85?C correspond respectively to the southern borders of subarctic, boreal and northern temperate, and middle temperate subzones of the temperate zone. The formation of vegetation cover of North Asia is controlled by polar, boreal, and temperate macroclimates. Basic intrazonal variations of vegetation along the gradient of continentality depend on the variations of the yearly heat and precipitation distribution and can be classified into seven climatic types: hyperoceanic, oceanic, suboceanic, maritime, continental, subcontinental, and ultracontinental. Climatic factors, especially the amount of heat, longevity of growing season, and amount of precipitation in a growing season appear to be major contributors into the zonal and sectoral differentiation of vegetation complexes. The use of global bioclimatic classification of Rivas-Martinez (1999), in combination with phytosociological knowledge and a concept of zonal sites (Pojar et al., 1987), provides powerful tools for three dimensional arrangement of vegetation along the latitudinal, longitudinal, and altitudinal gradients and for distinguishing the particular climatic factors limiting the development of each zonal vegetation type.
