THE INFLUENCE OF THE FOREST FIRES ON DEVELOPMENT OF GEOSYSTEMS OF THE FLAT INTERFLUVES OF THE SOUTH OF MIDDLE SIBERIA AND THE MOUNTAINS OF THE FAR EAST
Within the south of Middle Siberia and the mountains of the Far East, the forest fires coupled with «the challenges» of local degradation of permafrost in the bottoms of valleys, play a great morphogenetic role in the transformation of a general outlook of the earth surface and internal composition of the geosystems of the extensive flat interfluves and the slope territories. Transformation of an active surface (forest vegetation, a soil cover, non-forest spaces with rare undergrowth and others) occurs because of the local fires (which do not damage cardinally an under wood) and the general ones (destroying wood vegetation and a soil cover and causing burning out of the upper humus soil layer, most fertile, and its dramatic drying out). In Middle Siberia on extensive flat interfluves spaces the fires cause formation of the bright stage-dynamic forms of a small polygonal relief (by V.M.Devis’ terminology, the stages of juvenility, youth, maturity, and anility). In the mountains of the south of the Far East on the slopes the forest fires lead to a cardinal change (to strengthening or weakness) of intensity of the slope processes (deserption, solifluction, curum-formation and others) after wood vegetation disappears, because of the direct influence (loosening or joining) on the relief-forming substrata and the subsequent transformation of initial hydrothermal features of an active surface (to the direction of drying out of an active soil- ground layer). As a whole, the fires destroy the former geosystems and on their place new geosystems appear, i.e. in relation to a transformed territory they destruct the old geosystems and at the same time they create the new ones. The natural processes of restoration of geosystems to initial conditions are active now and if an extraneous intervention does not happen, they will be restored rather quickly and the traces of a small polygonal relief on the surface will disappear and remain only «under a fossil condition».