花崗岩急斜面の表層崩壊跡地における植生遷移と表層崩壊の発生周期

DOI Web Site 参考文献6件

書誌事項

タイトル別名
  • Woody Vegetation Succession and Prediction of the Occurrence Cycle of Shallow Landslides on Steep Granite Slopes

抄録

<p>  We investigated woody vegetation succession and the rate of topsoil development on shallow landslide scars on steep granite slopes in Kagoshima Prefecture, Japan. We used our results to predict the occurrence cycle of shallow landslides. For this study, nine shallow landslide scars of ≥40º were selected. The age of the scars ranged from 2 to 49 years. We installed 5 m × 5 m quadrats in the scars and conducted a field study. The results showed that woody vegetation in the quadrats had a smaller Fisher-Williams index of diversity and the rate of evergreen broad-leaved trees than a climax forest. Accordingly, the succession of woody vegetation in the quadrats was not at the level of a climax forest. The rate of topsoil development, based on the relationship between topsoil depth and the time since the occurrence of the shallow landslide, was 0.25 cm/year. Thus, the occurrence cycle of shallow landslides, based on the topsoil depth needed to generate a shallow landslide and the rate of topsoil development, ranged from 200 to 300 years (average 248 years). Our method was effective for predicting the occurrence of shallow landslides on steep granite slopes.</p>

収録刊行物

参考文献 (6)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ