Regeneration of Quercus serrara 14 years after forest cutting by the seed-tree method and mechanical ground treatment

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  • 機械地床処理を導入したコナラ天然下種更新試験地における14年後の更新状況
  • キカイチショウ ショリ オ ドウニュウ シタ コナラ テンネン ゲス コウシン シケンチ ニ オケル 14ネンゴ ノ コウシン ジョウキョウ

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Abstract

Tree species composition and the height growth of regenerating Quercus serrata trees were examined in an experimental forest managed by the seed-tree method 14 years after cutting. We examined whether stands in which many Q. serrata seedlings had been established had become Q. serrata-dominated stands 14 years after cutting. In a stand without mechanical ground treatment by a small-sized excavator, the resulting secondary stand was dominated by Magnolia obovata and Castanea crenata, and regenerating Q. serrata trees were not found. By contrast, in a stand with mechanical ground treatment, many regenerating Q. serrata trees were found. However, the relative dominance of regenerating Q. serrata trees based on basal area was lower than those of M. obovata and Swida controversa trees. In addition, the height increment of regenerating Q. serrata trees was also lower than those of M. obovata trees. It appears that the height growth of regenerating Q. serrata trees was suppressed by severe competition for light with the other trees such as M. obovata and S. controversa trees and the resulting secondary stand was dominated by M. obovata and S. controversa. Clearing and improvement cutting are essential to remove woody vegetation except for Q. serrata to achieve the successful regeneration of Q. serrata trees.

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