Distribution and Physical Properties of Colluvium and Saprolite in Unchannelized Valleys in Tsukuba Experimental Basin, Japan

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To clarify the role of colluvium and saprohte in the hydrological processes of a forested mountain, the thickness and the physical properties of them were investigated at the Tsukuba Experimental Basin. We measured their thickness using a penetrometer, surveyed soil profiles, and analyzed undisturbed cylindrical samples for measurements of physical properties. At the zero-order basin, which is mainly covered by volcanic ash, the colluvmm is mostly over 1.0 m in thickness. Along the axis of the basin, we found colluvium over 6.0 m thick. The saprolite thickness is heterogeneously distributed over the hillslopes and along the axis of the hollow, where it is rather thick. The physical properties of shallow colluvium, deep colluvium and saprolite, particularly bulk density and total porosity, are different. Thick colluvium and saprolite play an important role as a buffer against direct runoff.
一般社団法人日本森林学会の論文
1999-08-16