ハゲ山モデル

小起伏山地における森林と表土の荒廃・回復過程の分析

抄録

A conceptual process model is presented to analyse the whole process of devastation, denudation and recovery of forests and soils on low relief mountains. The model is composed of the four zones which represent a respective erosion type. The four zones are as follows : The mature forest zone where deep landslides ocurring as natural phenomena are predominant ; The preparatory zone of the active erosion front where shallow landslides are accerelated by forest deterioation and cutting ; The active erosion front zone where most sivere surface erosion and soil slides occur simultainiously ; The bareland zone where the surface soil is denudeted. The model clearif ed the spatial and the temporal process of devastation of forests and denudation of soils, and the importance of accerelation of soil slides by forest cuting in sediment disasters during the past half century.