浅間山噴火(1783年)による埋没表層土の土壌構造に認められる埋没前の植生・土地利用の影響

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The ridge shapes of arable lands are often observed inside buried soil layers covered by huge amounts of volcanic deposits in Japan. The object of this study is to clarify the chemical and physical characteristics of past-cultivated soils and to find any indicator useful for the identification of the ancient upland soils in ruins. This study was carried out Shimohara in Gunma prefecture, Central Japan, where it has been historically made clear that the former land surfaces had been cultivated and were buried by sediment of volcanic mudflow deposits of the 1783 eruption of Asama volcano. Soil samples were taken from each horizon in the mudflow layer and the buried soils located at the cultivated sites and non-cultivated sites. For comparing physical properties and soil micromorphology between cultivated sites and non-cultivated soils in Edo Period. The results are as follow: 1) The structure of soil micromorphology of the cultivated sites was compacter than those in the non-cultivated sites. The contents of the values of bulk density were higher in the former sites. These tendencies recognized at the surface soils of Edo Period were also observed at the recent surface soil. 2). The dominant voidsof soil micromorphological structure (×75) of the cultivated sites were strongly developed Vughs and channels (Table 1). Those of the non-cultivated sites were weakly developed complex packing voids. It is suggested that cultivation during Edo Period made soil structures more compact than soils under natural vegetation.
国立科学博物館の論文
2005-12-26

浅間山噴火(1783年)による埋没表層土の土壌構造に認められる埋没前の植生・土地利用の影響

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