ヒノキ林におけるプロットサイズ(斜面長)と土壌流亡量の関係

概要

論文の詳細を見る
Field runoff plots were established to evaluate the effects of slope length on surface soil loss on Hinoki (Chamaecyparis obtusa) plantation. In order to understand the processes determining slope length effects on soil loss, rainfall simulation was also conducted using a large-scale rainfall simulator. The soil loss from hinoki plantation was not significantly affected by slope length. This result agreed with previous studies reported in hinoki plantations in Japan. Generally, overland flow rarely occurs on undisturbed Japanese forested slopes. Therefore dominance of splash erosion by raindrops at hinoki plantation was suggested. On the contrary, high erosion rate on longer slopes was observed at rainfall simulation. Thus, if spatial variability of soil physical properties increases with plot size, it induces the dominance of inter-rill erosion on a natural slope. In that case, soil erosion would not be proportional to slope length.
日本地形学連合の論文
2003-10-25