Origin of epicormic branches and effect of thinning on their development in <I>Quercus mongolica var.grosseserrata</I>

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  • YOKOI S.
    Gifu Pref. Cold Dist. For. Exp. Stn.
  • YAMAGUCHI K.
    Gifu Pref. Cold Dist. For. Exp. Stn. Gifu Pref. For. Junior College

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  • ミズナラの後生枝の発生起源と間伐がその発達に及ぼす影響
  • ミズナラ ノ コウセイ シ ノ ハッセイ キゲン ト カンバツ ガ ソノ ハッ

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The origin of epicormic branches and the effect of thinning on their development were studied in Quercus mongolica FISCHER var. grosseserrata REHD. et WILS. In all of the observed epicormic branches, bud traces connected with the piths were found, so it was confirmed that they were formed from the suppressed buds that originated from the lateral buds. The Q. mongolica trees with epicormic branches were frequently, regardless of the tree diameter and age, in the unthinned stands, but most epicormic branches died in the current or next year of emergence. In the thinned stands, many epicormic branches existed, and most of them emerged just before or within three years after the thinning. These results suggest the following : The epicormic branches emerge constantly in a closed stand, and this constant emergence is supported by the existence of suppressed buds. Although the light conditions are insufficient for survival of epicormic branches in closed stand, the change of light conditions by a thinning may result in the large survival rate of epicormic branches and in the development of them. A few epicormic branches emerge after the passing of several years following the thinning.

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