THE REGIONAL BIOCLIMATIC SYSTEM AND ITS EVOLUTIONARY ROLE ON THE INSULAR-ARC STAGE OF CONTINENTAL

Local geomorphological conditions formed the centres of genesis of varied phytocoenological structures of the higher (zonal-regional) level at the first stages of continental biosphere development on the island-arc stage of continental biosphere development in the North-West Pacific. On insular extratropical Neo-Pacific compared to neighbouring continents, the causal causes of the general descent of altitudinal climatic zone boundaries and the southerly movement of natural zones are discussed. The direct subordination of phytobiota to vertical hydrothermal gradients is a remarkable feature of the bioclimatic system at the stage of insular landscape creation. Within a low-mountain terrain, it forms an altitudinal zonality system. Forest phytobiota play an extremely significant backbone role in the creation and evolution of new volcanic environments. In comparison to their zonal analogues on the neighbouring continent, the optimum strategy programme for the growth of plant communities, which is aimed at maximal biomass creation on forest island-arc landscapes, is considerably more pronounced. At the same time, the biological cycle is accelerated due to an unusually high percentage of green mass in the production structure. Under unfavourable "cold" oceanicity conditions, all of the foregoing ensures the survival of insular ecosystems in the boreal Neo-Pacific.

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