Effect of Thinniug on the Thickening Growth of Stems and Development of Epicormic Shoots in a Secondary Forest of Quercus crispula and Fagus crenata.

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  • ミズナラとブナを主とする二次林に対する間伐が幹の肥大成長や後生枝の発達に与える影響
  • ミズナラ ト ブナ オ シュ ト スル 2ジリン ニ タイスル カンバツ ガ ミキ ノ ヒダイ セイチョウ ヤ ゴセイ シ ノ ハッタツ ニ アタエル エイキョウ

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Effects of thinning for 21 years (or 20 years) in a 45 year-old secondary forest dominated with Quercus crispula and Fagus crenata were examined in Misasa forests of Field Science Center, Faculty of Agriculture, Tottori University. In this experiment, we adopted a method of crown thinning. The mean growth increment (GI) or rate (GR) per year of total basal area was higher in thinning or thinning+fertilization plots than in the control (non-thinned) plots. However, the fertilization alone was not effective. From the relationship between the diameter at breast height (DBH) just after thinning and mean GI or GR of the basal area of individual stems, the effect of thinning was clear in small or middle sized stems in which the big stems with a DBH of more than 25 cm increased after thinning (thinning+fertilization) compared with the control plots. The high-rate thinning of the stems in the large DBH class contributed to the increase of big stems. The effect of thinning on the growth of Quercus clispula, Fagus crenata and Betula grossa was clear, but not in the case of Acanthopanax sciadophyloides or Cornus controversa. Several stems of the latter 2 species died in the thinning and thinning+fertilization plots, but not in the control plots. In the Quercus crispula, the mean number of epicormic shoots per stem and the stand volume after 21 years of thinning showed a significant negative correlation. It is concluded that high- and even-rate thinning of stems in the large DBH species comprising the crown canopy promoted the thickening growth of individual stems and total volume in the stand contributing to control of the development of epicormic shoots.

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