抄録
Parent materials of the soils are unsolidified shalely gravels originated from deluvial deposit (Yashiroda form.). Because of a large quantity of winter snow which melts out in warm spring at one time, it is obscure to estimate the climatic factors participate in the weathering process. For instance mean annual temperature is 19℃. excluding four months from Dec. to Mar. Annual rainfall is 2670.8mm. Then LANG'S Rain-factor becomes 140.5. On the flora, Pinus densiflora is dominate. Humus content of surface soils is somewhat rich. The colour of subsurface soils is light yellowish brown to dark yellowish red. Soil reactions are strongly acid and the degree of base saturation is very low. SiO_2/R_2O_3 of the colloidal clay is about 1.0〜2.0. The amounts of free iron oxide and free alumina are fairly large. But there is no marked indication influenced by the podosolization. I consider that these soils may be grouped as a yellow or red soil.
