Growth and deer damage monitoring in young unsuccessful sugi and hinoki plantation

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  • スギ・ヒノキ不成績造林地におけるシカ被害と生育モニタリング
  • スギ・ヒノキ不成績造林地におけるシカ被害および生育モニタリング
  • スギ ヒノキ フセイセキ ゾウリンチ ニ オケル シカ ヒガイ オヨビ セイイク モニタリング

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An alternative silvicultural or management scheme for the clear cutting system in Kyushu University Forests in Miyazaki became necessary because of the loss of sugi (Cryptomeria japonica) and hinoki (Chamaecyparis obtusa) plantation trees. This study analyzed the growth of planted trees and deer damages from monitoring results carried out in both 1990 and 1997, and examined the forest management alternatives. As a result, there has been a substantial decrease in the numbers of plantation trees. Furthermore, many planted trees have suffered much deer damages such as peeling of stem bark that drastically lowered the merchantable log value. Considering these situations, two management alternatives were proposed: 1) Silvicultural operations are to be performed only on selected healthy trees expected to survive until the final cutting. Other damaged trees would be left only for maintaining the stand density. 2) The management objective would be changed to enhance the growth of invaded broad leaf trees and to develop a mixture forest instead of the present forest to produce medium quality timber.

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