DEVELOPMENT OF SUBALPINE CONIFEROUS FORESTS IN RELATION TO THE SNOW ACCUMULATION DEPTH AND THE EXTENT OF SUBALPINE AREA : IN THE CASE OF THE JO-ETSU MOUNTAINS AND VICINITY, CENTRAL JAPAN

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  • 亜高山帯針葉樹林の分布状態と積雪深および亜高山帯域の広さとの関係 : 上越山地を中心とする地域について
  • アコウザンタイ シンヨウジュリン ノ ブンプ ジョウタイ ト セキセツシン オ

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Abstract

It is well-known that several mountains in central and northeastern Honshu, Japan, lack coniferous forests in their subalpine zones. In order to clarify the factors determining this phenomenon, the development of subalpine coniferous forests, the snow accumulation depth and the extent of subalpine area were surveyed in the Jo-etsu Mountains and their vicinity. Generally, the subalpine coniferous forests were poorly developed in mountains with heavy snowfall, but were well extended on mountains or peaks in mountain regions with larger extents of subalpine area. These facts suggest that on each mountain the extent of subalpine coniferous forests has changed in close relation with the extent of the subalpine area and the accumulated snow depth condition. This has continued throughout the climatic changes during the Postglacial Age, especially the Postglacial Warm Period, when the extent of coniferous forests was markedly reduced.

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