奥羽山脈南部における針葉樹の偏形について

概要

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Remarkable deformation is seen at the crowns of coniferous trees such as <I>Abies Mariesii, Tsuga diversifolia, Thuja Standishi</I> etc. which grow in the subalpine zone above 1200-1400 meters of Azuma, Adatara, Bandai and Zaô Mountains, Tohoku district (Photo. 1). The author surveyed on Mt. Zaô to analyse the relationship between the prevailing wind and the direction of deformation, and concluded that the direction of deformation was in accord with that of the prevailing winter wind.<BR>The results are shown in the distribution maps of the direction of deformation along the ridges of Azuma, Adatara and Banadai Mountains. According to the maps, in Nishiazuma area (Fig. 2) in which the main range extend east and west most crowns are facing northeast, while in Higashiazuma (Fig. 3) and Adatara (Fig. 4) where the main ranges run from north to south and in Bandai area (Fig. 5) which forms an isolated mountain body most crowns are facing east. It should be understood that WNW winter monsoon is prevailing at the upper air in these areas, though near the ridge surface of Nishiazuma area SW wind blows under the influence of the direction of ranges and valleys. Therefore it is supposed that these mountain ranges and valleys cause the divergence and convergence of winter monsoon (Fig. 6) .
東北地理学会の論文