Stand Structure and Snow Damage in Relation to Stand Age

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  • 林齢に沿った林分構造と冠雪害の関係
  • 林齢に沿った林分構造と冠雪害の関係--56豪雪福井スギ人工林〔英文〕
  • リンレイ ニ ソッタ リンブン コウゾウ ト カン セツガイ ノ カンケイ 5
  • 56豪雪福井スギ人工林
  • Sugi Plantations in Fukui Prefecture in the 1981 Heavy-Snowfall

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Abstract

The snow damage of sugi plantations which suffered from an unusual heavy wet snowfall in Fukui Prefecture at the end of December, 1980 was analyzed focussing on the relationship between damage and stand structure in relation to stand age. The diameters at broken points of stems (DBP) were almost all in the range of 7_??_20cm in all stands. Therefore, there was a tendency for the heights at broken points (HBP) to increase proportionally as tree height (H) increased, but the heights at crown bottoms (HDB) did not vary much with the variation of H. Thus, as H increased, HBP was placed at a greater distance upward from HCB, and as H decreased, HBP was placed at a greater distance downward from HCB. This implies that a long lotation is desirable to reduce such damage from the viewpoint of forest management, The proportion of bending was small even in small-sized trees, and the proportion of breakage was extremely large. The proportion of damage in dominants was small, but that in suppressed trees was large as it was in intermediates. Extraordinary large DBPS were found. These characteristics can be said as an index of snow damage of sugi under the severest of meteorological conditions.

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