Thinning Effect for the Old Cyptomeria japonica Stand on the Experimental Plot in Shiraga-dake, Kagoshima Prefecture

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  • 白鹿岳間伐試験におけるスギ高齢林の間伐効果について : 相対幹距比を基礎にした分析
  • 白鹿岳間伐試験地におけるスギ高齢林の間伐効果について--相対幹距比を基礎にした分析
  • シラガダケ カンバツ シケンチ ニ オケル スギ コウレイリン ノ カンバツ コウカ ニ ツイテ ソウタイ カンキョヒ オ キソ ニ シタ ブンセキ

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Abstract

The thinning effects for old Sugi(Cryptomeria japonica) stand were analyzed for 20 years from 70 to 90-years old on the experimental plot in Shiraga-dake, Kagoshima Prefecture. The thinning intensity was decided by the percentage of the mean distance between stems to the mean height of the upper-trees. The four thinning intensities, that is control(unthinned), weak(13%), medium(15%) and heavy(17%), were conducted in the experimental plot. The medium and heavy thinned areas have the larger growth of the diameter and total yield volume than the weak- and unthinned areas. Therefor, the higher ratio than 15% shows the thinning effects for the old sugi stand was concluded.

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