Stump Sprouting of Main Woody Species in Secondary Forest of Pine Mass-dieback under Different Thinning Intensity

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  • 松枯れ激害地における伐採強度の差による主要構成樹種の萌芽再生の比較
  • マツ ガレ ゲキガイチ ニ オケル バッサイ キョウド ノ サ ニ ヨル シュヨウ コウセイ ジュシュ ノ ホウガ サイセイ ノ ヒカク

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To study the relationship between thinning intensity and regeneration by sprouts of main woody species in secondary forest of Pine mass-dieback, regeneration of sprouts occurring in 3 years following the cut under 3 different thinning intensity, were investigated for 5 woody species, Ilex pedunculosa, Lyonia oualifolia, Eurya japonica, Rhododendron reticulatum and Abelia serrata. Patterns of the number and elongation of sprouts by age were observed as a convex pattern with a peak in tree species, I. pedunculosa and L. oualifolia, whereas those were observed as a constant pattern in shrub species, E. japonica and R. reticulatum. The number and elongation of sprouts showed significant differences in I. pedunculosa and L. oualifolia at a clear-cut area. According to the results, when the cutting age is about 30 years, I. pedunculosa and L. oualifolia tend to dominate. The clear-cutting seems to increase the relative dominance ratio in I. pedunculosa and L.ovalifolia, which are originated from sprouts.

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