2023 Fiscal Year Final Research Report
How should harvesting areas be allocated in mountainous areas? A quantitative evaluation of the risk of gap enlargement due to wind
| Project/Area Number |
21K05667
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 40010:Forest science-related
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| Research Institution | Shizuoka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
楢本 正明 静岡大学, 農学部, 准教授 (10507635)
上村 佳奈 信州大学, 学術研究院農学系, 准教授 (40570982)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | ギャップ拡大現象 / 風ストレス / 伐採区 / 幹振動 / 樹液流速 |
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| Outline of Final Research Achievements |
To investigate the design of harvesting areas to reduce wind impact on forests in mountainous regions, this study aimed to clarify the mechanism of wind-induced gap expansion. Trees in forests adjacent to clear-cut areas were found to be more susceptible to wind damage as the nearby gap rate and tree height increased. The wind load on trees was influenced not only by the distance from the forest edge but also by micro-topography. Mutual support among adjacent trees played a significant role in the impact of small canopy gaps on wind damage. The resistance of edge trees to wind damage in cypress forests increased with the size of individual trees. However, this wind resistance did not become apparent until several years after logging. Additionally, new edge trees created after clear-cutting were prone to water stress.
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| Free Research Field |
造林
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| Academic Significance and Societal Importance of the Research Achievements |
気象の極端現象の増加に伴い，森林に対する風害の増大が懸念されている.各地で促進されている皆伐更新は植被構造をドラスティックに改変するため，周辺森林への風攪乱を増大させる危険がある．森林のギャップ拡大パターンをゲーム理論等で再現するこころみはあるが，拡大メカニズムがブラックボックスとなっているため，様々な環境要因を反映した実用的な評価にはほど遠い．林業現場での伐採区の配置について，気象害のリスク軽減の視点での研究は限られている.本研究は気象攪乱の視点から考えて，択伐あるいは間伐から大面積皆伐までの施業リスクを定量的に評価することで，伐採区デザイン技術を提案しようとする研究に位置付けられる．
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