2022 Fiscal Year Final Research Report

The stratgies of planted forest management for converting to mixed forests

Research Project

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Project/Area Number	20H03023
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 40010:Forest science-related
Research Institution	The University of Tokyo
Principal Investigator	Nakajima Tohru 東京大学, 大学院農学生命科学研究科(農学部), 助教 (10598775)
Co-Investigator(Kenkyū-buntansha)	當山啓介東京大学, 大学院農学生命科学研究科(農学部), 助教 (00613001) 城田徹央信州大学, 学術研究院農学系, 助教 (10374711) 光田靖宮崎大学, 農学部, 教授 (30414494) 長島啓子京都府立大学, 生命環境科学研究科, 教授 (40582987) 北原文章国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員等 (50582748) 斎藤仁志岩手大学, 農学部, 准教授 (60637130) 瀧誠志郎国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員等 (70714103) 中澤昌彦国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員等 (90455262)
Project Period (FY)	2020-04-01 – 2023-03-31
Keywords	森林経営 / 広葉樹 / 針葉樹 / 経済性 / 木材生産 / 多様性 / 最適化
Outline of Final Research Achievements	At the Chichibu Forest of the University of Tokyo, high-resolution topographical information based on aerial laser surveying and time-series numbers of species observed in unsuccessful afforestation areas, secondary forests, and old growth forests were used for comparison analysis. The high diversity observed is also associated with spatial diversity such as microtopography, which converges to similar stand composition with sufficient aging of the local forest physiology, including unsuccessful plantations. Furthermore, according to the logging plan of the region, we defined the balanced area distribution by age class as environmental diversity, and formulated it as a multi-objective optimization problem consisting of wood production, carbon stock, soil runoff, etc. We quantified the trade-offs with different timber production volumes, etc., depending on the constraints imposed on forestry management.
Free Research Field	森林科学
Academic Significance and Societal Importance of the Research Achievements	本研究の学術的意義・社会的意義は、以下の３点である。（１）多様な林型や立地条件に対する広葉樹林化の可能性の検証。（２）多面的機能の相対比較による、広葉樹林化も考慮した人工林管理の最適化の実現。（３）（１）および（２）を基礎とした林業実務者へのヒアリングに基づく、意思決定支援・社会還元の可能性の実証。