多雪環境下における樹木の力学的特性Ⅲ

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タイトル別名
  • DYNAMIC CHARACTERISTICS OF TREES IN SNOWY ENVIRONMENTS III
  • DYNAMIC CHARACTERISTICS OF TREES IN SNOWY ENVIRONMENTS(3)

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<p>We studied the appearance and mechanical characteristics of trees in plant communities with heavy snow in Katashina Village, Gunma Prefecture, Japan. Abietetum veitchio-mariesii was coniferous forest type mixed with Abies veitchii and A. mariesii on a ridge and Abietetum mariesii appeared on a gentle slope. The Hamamelido-Fagetum crenatae forest type occurred on a gentle ridge. We investigated the physical properties of cut tree trunks and branches. A static bending test was conducted, and fracture strength, strain, strain energy, specific gravity, and water content of the specimens were examined. A. veitchii and A. mariesii had lower fracture strength than the broadleaf trees we investigated, including frutescent Lindera umbellata var. membranacea. A. veitchii and A. mariesii showed a constant fracture strength regardless of branch size. The strength of Fagus crenata suggested mechanical plasticity and variability in response to environmental conditions, such as snow pressure. L. umbellata var. membranacea showed higher strength among Lauraceae. The conifer species showed a tendency toward higher values than broadleaf tree species for strain. Abies species branches have the ability to bend more to accommodate for snow. A. mariesii showed lower fracture stress and larger strain than A. veitchii, due to a strategy to bend more with more snow pressure.</p>

収録刊行物

  • 生態環境研究

    生態環境研究 24 (1), 17-26, 2017-12-28

    公益財団法人 地球環境戦略研究機関 国際生態学センター

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