斜面上の土壌形成と物質移動
スポンサーリンク
概要
- 論文の詳細を見る
One of the investigated areas is a ridge type slope with convex cross section consisting of thin vegetation at the upper half and dense vegetation at the lower half. Another area is a valley type slope with concave cross section with dense vegetation. The parent material in these areas is weathered sandy tuff.<BR>On the soil formation of this area, it is shown that the thickness of A-horizon varies according to local difference in gradient or vegetation on the slope. On the whole area of valley type slope and on the lower half of ridge type slope, A-horizon is generally thick even where the slopes are steep, then a buried A-horizon is found there. On the upper half of ridge type slope, A-horizon is thin even at gentle slope. On the slopes of either ridge type or valley type, B-horizon is thick at gentle slopes and thin at steep slopes. According to the grain analysis, the soil is rich in fine materials on the valley type slopes and the lower half of ridge type slopes. On the upper half of ridge type slope, the soil is rich in coarse mate<BR>Seemingly, those local differences of soil formation were caused by the differences in slope forms and the density of the vegetation.<BR>First, the slope forms affect the movement of soil materials. It seems that the denudation of slope surface is active on slopes with poor vegetation, and is weak where the vegetation is dense. Therefore the fine materials supplied from surrounding areas are accumulated on the slopes covered with dense vegetation in the lower part of the slopes. In such cases the vegetation is usually poor in the upper part of the slopes.<BR>According to the rapid destruction of vegetation, the denudation is accelerated and so the buried soil is formed at the slope-end. Apparently, the denudation of slope has become active by the human impact to the vegetation since Holocene.<BR>According to the destruction of vegetation, such buried soil as was seen in this slope was formed widely in other areas, too.<BR>In the study of buried soil on slope, the movement of fine materials on the slopes is considered as an important factor for the soil formation except the cases of the aeolian origin such as volcanic ash or sand.
- 東北地理学会の論文
東北地理学会 | 論文
- ハイプレーンズにおける農地保全政策CRPの展開 -カンザス州南西部カーニー郡を中心として-
- 北海道における生シイタケ栽培への企業参入と生産構造の変容
- 宮城県花山村大沼湿原周辺の丘陵地における過去1,500年間の植生変遷と人間活動
- 宮城県花山村の地すべり地における地震動に伴う滑落崖の崩落 : 2003年5月26日宮城県沖の地震での発生事例
- 書評・紹介 金子晃著:ヒマラヤ山麓に柔道があった