シラス急斜面における森林の成長と表層崩壊防止機能の変化

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  • Revegetation and the Landslide Prevention Function of Forest Root Networks on Shallow Landslides on Shirasu-soil Steep Slopes in Kagoshima Prefecture

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<p>  We investigated temporal variations in the landslide prevention function of forest root networks on shallow landslides resulting from coniferous plantation growth, and the recovery period of the landslide prevention function of forest root networks on shallow landslides in broad-leaf forests on shallow landslide scars in an area of Shirasu-soil (Ito pyroclastic flow deposits) steep slopes in Kagoshima Prefecture, Japan. The study site has an area of 3.94 km2. To study the temporal variations in the landslide prevention function resulting from coniferous plantation growth in the study site, we interpreted aerial photographs taken in 1965, 1967, 1970, 1974, 1978, 1989, 1994 and 2003, and detected temporal variations in the occurrence of shallow landslides. The numbers and areas of shallow landslides were greater for tree ages of 20 years or less than for tree ages of 20 years or more. The prevention function increased over time and was restored after 20 years. Conversely, on slopes covered with broad-leaf forests on shallow landslide scars the prevention function was restored after 50 years, because the process of natural forest recovery was slower in these areas. This finding indicates that the risk of landslides in broad-leaf forests persists for 30 years after the occurrence of shallow landslides, considerably longer than in actively managed coniferous plantations.</p>

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