石灰岩性赤色土壌の土壌特性と気候について

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The climatic conditions and the properties of red soils originated from limestone in the Nansei Shoto, Japan, are compared with those in the Dalmatia region of Yugoslavia. The values of Fe_2O_3%, the peak intensity of hematite and goethite are different in both areas. The amount of Fe_2O_3% in Mediterranean red soils is about 10 times greater than that of Nansei Shoto. The peak intensities of hematite obtained from Mediterranean red soils are higher than those of Nansei Shoto. This suggests that the irons of Mediterranean red soils are composed of not only crystalline types but also of amorphous type. This phenomena means that the present climatic conditions play an important role in the rubefaction of soil. One of the reasons why the higher amounts of free iron oxides are obtained from the soils in the Dalmatia region of Yugoslavia, is attributable to the Mediterranean climate, which has dry season in summer every year. Such climatic condition might be effective to keep amorphous iron and hematite. On the other hand, the present climatic conditions in the Nansei Shoto, in where occurrence of stronger water deficiency in summer is less frequent than in the Mediterranean region, may not be so suitable as those in Yugoslavia for the transition from goethite to hematite and for the formation of hematite. The amount of MnO% in Yugoslavia is about 10 to 100 times greater than that of Nansei Shoto. The value of pH is also higher in the Mediterranean red soils than that of Nansei Shoto. From these facts, it can be concluded that the free manganese oxides might be well kept in the soil profiles as manganese oxides under the conditions of high pH and rather dry climate in Yugoslavia.
駒澤大学の論文

石灰岩性赤色土壌の土壌特性と気候について

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