造林木におけるアテ材形成と地すべり変動履歴

概要

論文の詳細を見る
In general, landslide mass can be divided into small blocks depending upon their activities. The objective of this study is to clarify the historical movement of these blocks using dendrochronological analysis. Firstly, we investigated microtopography and inclination of trees (Abies sachalinensis) planted on gentle slope of the landslide. Secondly, we examined compression woods of tree rings formed in the inclined stems. In terms of compression wood, date of initiation, change in forming direction, and increase in areal extent are important factors to analyze historical movement of landslide.<BR>The landslide investigated is formed by two blocks which indicate different directions and histories of mass movement, although tree ring analysis clarified extensive movements from 1972 to 1973 and from 1986 to 1987 in both blocks. Ring samples in which compression woods are formed in different directions were found at the central area of each block, whereas samples showing extensive compression wood were found near the crack within each block. These results suggest frequent and complex movements in a small scale within a block.
社団法人日本地すべり学会の論文