Studies on the thinning experiment for the old Chamacecyparis obtusa plantation forest in the Kyushu University Forests in Sasaguri, Fukuoka prefecture

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  • 九州大学福岡演習林におけるヒノキ高齢林の間伐に関する研究 : 間伐による林内光環境の変化と予測
  • キュウシュウ ダイガク フクオカ エンシュウリン ニ オケル ヒノキ コウレイリン ノ カンバツ ニ カンスル ケンキュウ カンバツ ニ ヨル リンナイ ヒカリカンキョウ ノ ヘンカ ト ヨソク

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A thinning experiment is being conducted in the old Chamaecyparis obtusa plantation forest. The thinning intensity is based on Sr, which is the percentage of the average distance between stems to the average height of upper trees. The experimental plots established are control (non-thinning; Sr 15%), light (Sr 17%), normal (Sr 20%) and heavy (Sr 23%) thinning. The relative light intensity are measured in each plot before and after thinning, and the changes of relative light intensity, stand structures and crown structures were recorded. In particular, we analyzed the relation between the total crown surface area per ha and the relative light intensity. Furthermore, we predicted the total crown surface area and the relative light intensity after thinning based on the tree height growth data by stem analysis and the crown model. This study revealed that the total crown surface area is the one factor that controls the relative light intensity in the stand.

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