豪雪地帯の森林伐採と雪崩

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書誌事項

タイトル別名
  • Forest cutting and avalanches on heavy snow slopes
  • ゴウセツ チタイ ノ シンリン バッサイ ト ナダレ

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抄録

Drop-off processes of stumps after cutting on the mountain slopes in the Naeba Mountains, south Niigata Prefecture, where seasonal snowpacks between 3 m and 5 m deep on the average, were followed during 8 years, regarding their work in controlling avalanches.<BR>1. Stumps with a higher center of gravity, or in heigher height-to-diameter ratio fell in number from earlier years after cutting than those in lower ratio. Stumps started to fall in number at 6 years after clear cutting and they decreased to half in 9 years, resulted by their decaying and outrooting due to large snow pressure.<BR>2. In general the total glide gap of inclined snowpacks in each winter increased with decreasing stump density in number. Ground avalanches occurred on the grass thick slopes where seedlings had been planted just after clear cutting, only when the stump densities decreased to about 100 stumps/ha afterwards. On the bushy uncontrolled slopes where no trees had been planted after clear cutting, no avalanches occurred dispite drop-off of the stump number and increase of snow glide gap. This is because a part of bushes grew to a greater size thereafter was enough to check release of avalanches.<BR>3. No avalanches occurred on the slopes where some intensities of selection cuttings had been tried. While the larger parts of clear cut slopes were developing into avalanche tracks denuded of vegetation inclusive of stumps and newly planted seedlings. In order to regenerate mountain forests in such heavy snow areas, it is preferable to retain effective snow supporting stands by treatment like selection cuttings.

収録刊行物

  • 雪氷

    雪氷 43 (1), 15-20, 1981

    公益社団法人 日本雪氷学会

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