Sunny Crown Diameter as a Tree Selection Indicator for Thinning at a Mature Sugi Artificial Forest

Takahashi Erina

doi:10.4005/jjfs.97.186

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Other Title

壮齢スギ人工林における陽樹冠直径を基準とした間伐選木方法の検討<i></i>
壮齢スギ人工林における陽樹冠直径を基準とした間伐選木方法の検討 : 島根大学三瓶演習林での検討
ソウレイスギジンコウリンニオケルヨウジュカンチョッケイオキジュントシタカンバツセンモクホウホウノケントウ : シマネダイガクサンビンエンシュウリンデノケントウ
―島根大学三瓶演習林での検討―
An Analysis of Sanbe Educational and Research Forest, Shimane University

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Description

Mature Sugi (Cryptomeria japonica) plantations that have been managed for over 50 years have increased in number throughout Japan. However, there are no criteria or indicators for tree selection before thinning. Here, we attempted to expand the understanding of sunny crown management in Yoshino Forestry by analyzing a mature artificial Sugi stand at Sanbe Educational and Research Forest, Shimane University. We examined the correlation of sunny crown diameter and annual diameter at breast height (DBH) growth, and the accuracy of annual ring growth estimates. We found a correlation between sunny crown diameter and annual DBH growth; with 79% accuracy, were able to estimate whether the annual ring width was 2 mm using sunny crown diameter ranges. Therefore, although sunny crown and DBH size is associated with different numbers of thinning times, it is a useful indicator of tree selection for thinning in the Sanbe mature forest, and may also be a useful indicator in thick, mature Sugi plantation forests in Japan.

Journal

Journal of the Japanese Forest Society

Journal of the Japanese Forest Society 97 (4), 186-190, 2015

The Japanese Forest Society

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