Analysis of the windthrow of Sanbu-sugi cultivar of <i>Cryptomeria japonica </i>D. Don and <i>Lithocarpus edulis</i> (Makino) Nakai caused by the Reiwa 1 Boso Peninsula Typhoon

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  • 令和元年房総半島台風によるサンブスギとマテバシイの風倒木の分析
  • レイワ ガンネン ボウソウ ハントウ タイフウ ニ ヨル サンブスギ ト マテバシイ ノ フウトウボク ノ ブンセキ

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Abstract

<p>The Reiwa 1 Boso Peninsula Typhoon caused many windthrows. Among them, we conducted tree census on the wind damage of the characteristic Sanbu-sugi cultivar forest and L. edulis forest. In the Sanbu-sugi cultivar forest established on the flat ground, all the stems with height / diameter ratio of 75 or more had stem breakage, and among the individuals with h/d ratio of 50 to 75, the stems with remarkable external symptoms of non-withered grooved wood decay disease increased stem breakage. The windthrow damage rate of the L. edulis forest established on land with a thick effective soil layer of 1 m or more was 66%, of which 85% was due to stem breakage. The windthrow damage rate of the L. edulis forest, which was established on a slope with a thin effective soil layer of 55 to 100 cm, was 75%, and 79% of L. edulis windthrown trees were due to uprooting.</p>

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