新潟県上越地方の土壌型に関する研究 (第2報) : 頸城平野周辺の洪積層丘陵土壌

概要

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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.
一般社団法人日本土壌肥料学会の論文
1955-02-15