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Title: 芦生演習林スギ造林地における雪起しの効果について
Other Titles: Effect of Operation of Pulling up the Fallen Tree caused by Snow Pressure at Sugi (Cryptomeria. Japonica) Stand in Kyoto University Forest in Ashiu
Authors: 山本, 俊明  KAKEN_name
酒井, 徹朗  KAKEN_name
吉村, 健次郎  KAKEN_name
和田, 茂彦  KAKEN_name
Author's alias: Yamamoto, Toshiaki
Sakai, Tetsuro
Yoshimura, Kenjiro
Wada, Shigehiko
Issue Date: 20-Dec-1979
Publisher: 京都大学農学部附属演習林
Journal title: 京都大学農学部演習林報告
Volume: 51
Start page: 96
End page: 109
Abstract: 春融雪後, 雪圧によって倒伏あるいは傾斜した造林木を引き起す雪起し作業は, 積雪地帯特有の保育作業であり, 林業経営上大きな支障となり問題となっている。本報告は, その問題となっている雪起し作業について, 雪起しを行なった場合とそうでない場合とについて造林木がどの様に生育するか比較検討するために芦生演習林内の造林地に試験区を設定し, 調査を行なった結果である。雪起し実行区と不実行区の生長の比較を行なった結果, 直径, 樹高, 幹の曲りの大きさで5%の有意差が認められ, その差は, 胸高直径で2. 9cm, 樹高で1. 6mで実行区の方が生長がよかった。現在の生長量で単純計算してみると, 4 - 9年の差に匹敵する。つぎに根曲りの程度は, 根元にたてた鉛直線の1. 0m高における幹までの長さで比較すると, 18cm - 31cm程度の差が認められた。また, 樹幹解析の結果から, 多雪の年は前年に比べ直径生長量が変化し落ちこむ傾向がみられ, アテが発生している。雪起し実行区では, 不実行区に比べ直径生長は良くアテの発生も少ないことがわかった。
After melting snow in spring, the operation to pull up fallen trees caused by snow pressure is peculiar forest tending work in snow regions and that is serious problem on forest management. This report is results of investigation about the effect of the operation to pull up the fallen tree caused by snow pressure in planted stand. Results of comparison on the growth between pull up stand and not conducted stand was significant at 0.05 level in diameter, tree height and size of curve of the stem, and its difference is 2.9 cm at D. B. H., 1.6 m at tree height, and it has certainly larger growth in conducted stand. If we estimate by the present growth, its difference is 4-9 year. Degree of the curve of stems were noted at 18-31 cm from vertical line at 1.0 m height on the root edge to the surface of stem. As result of stem analysis, there is tendency that in a heavy snow year diameter increment comes down as compared with the year before, and that tension woods come about. In the conducted stand, diameter increment were larger than that in the not conducted stand, and the number of tension woods were few.
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