赤色土壤の研究 : 1. 新潟県に分布する赤色土壤
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概要
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Of the reddish soils appearing in the areas occupying the middle part of Japan's cooltemperate zone in which the brown forest soils or slightly podzolised soils prevail, those found in Niigata Prefecture were studied.The distribution of the red soils of this area is restricted to the lower part of hilly districts as shown in Fig. 1. They resemble morphologically the red soils found in the south-western part of this country showing signs of eluviation on the surface horizon. Their surface is vulnerable to erosion, and in extreme cases, denuded lands entirely lacking the surface horizon together with vegetation are often seen.As the results of the writers' investigaton these soils are found to be the relict soils formed in the age between the upper Pliocene and the lower Diluvium. Fig. 2 and Fig. 5 are the distribution maps of these relict soils at the representative localities and Fig. 3,4 and Fig. 6 are the geological profiles of these localities.The shore line at the initial stage of the Sedimentation of Uonuma series (upper Pliocene ) is presented in Fig. 7,which indicates all red soils occurred as strata today were submerged and those of Sugatani (1) and Toyomi (2) villages, developed on the surface of the granite, remained on the coast.Climatic conditions of the age from the upper Pliocene to the lower Diluvium of this country are now under investigation. The fact that the supposed age of formation of these soils are that of the relict red soils covered by loess in North China are identical, along with future development in the study of climatology of ancient ages, will constitute a powerful clue to this study.The extreme nature of the climate of the studied area i. e. an alternation of humid winter and a warm and dry summer period might preserve both the red colour and the type of the soil.Details will be reported in the bulletin "Forest Soils of Japan" of the Government Forest Experiment Station in the near future.
- 1955-04-25
著者
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