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タイトル: A study on the sustainable management of natural teak forests in Myanmar
その他のタイトル: ミャンマーにおけるチーク天然林の持続的経営に関する研究
著者: Tin, Tin Myint
著者(別言語): ティン, ティン ミィント
発行日: 2012年4月13日
抄録: Myanmar has been experiencing natural teak forest degradation, consequent affect of over-exploitation of teak above the prescribed cut limit, and challenging of restoring its degraded forests. The un-sustainable way of teak production from the natural forests of Myanmar is the main driving factor to point out the currently applied Brandis yield model for Annual Allowable Cut (AAC) of teak and to propose an alternative model for the yield regulation of teak. This study was composed of five chapters: introduction, study site and data set, preliminary analysis of teak conditions in natural forests, developing alternative approach for yield regulation, discussion and conclusion. Under the system of Myanma Selection System (MSS), it was believed that the future consistent supply of teak would be ensured by following AAC with the prescribed girth limit for exploitable teak trees and felling cycle of thirty-year. Through the preliminary analysis on existing yield model, this study addressed that no forest stands had been harvested in accordance with AAC. Decreasing girth limit and shortening felling cycles were observed in the selected research site. In fact, this yield regulation model was developed over centuries for the sustainable teak productivity of the virgin natural forests which were almost untouched by disturbances. The author also examined disturbance finding in each girth class of teak stock. The loss of younger stems of teak between two felling cycles was suggested mainly due to illegal logging by local people staying near the forest sites. To resolve the drawbacks of existing yield model, the new model was developed by considering the utility of maturities as an index in the sustainable management of natural teak in stand levels. The concept of the maturity is to check whether the trees in each girth class moved to next higher class over years and if moved, the maturity was considered increase. As long as we found the maturity increase across the girth classes, that stand could be considered as stable and chosen for harvest. While Brandis’ method was applicable only for the forests with the excess amount of mature trees, the new one would be feasible to apply in the current situation of natural forests which has been facing the problems of degradation and over-exploitation of timber in Myanmar.
内容記述: 報告番号: ; 学位授与年月日: 2012-04-13 ; 学位の種別: 課程博士 ; 学位の種類: 博士(農学) ; 学位記番号: 博農第3846号 ; 研究科・専攻: 農学系研究科森林科学専攻
URI: http://hdl.handle.net/2261/54237
出現カテゴリ:021 博士論文
1160820 博士論文(森林科学専攻)

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