SOIL GENESIS ON THE RAISED CORAL REEF TERRACES OF ISHIGAKI- AND OKINAWA-ISLANDS IN THE RYUKYU ISLANDS, JAPAN : II. Chronosequential Changes of Clay Mineralogical Composition

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概要

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• Granulometric and clay mineralogical analyses were performed on soil types differing in their genesis which had been formed on the raised coral limestone terraces and plateaux under the perhumid subtropical maritime climate of the Ryukyu Islands. The amount of clay fraction i Rendzina-like soil on the lower terrace was relatively small (8-34%) and decreased with depth, while those in Terra fusca-like soils on the middle terraces and in Terra rossa-like soil on the plateau were very large (45-78%) suggesting the occurrence of clay migration. Rendzina-like soil mainly contained illite and metahalloysite with a moderate amount of mixed layered mineral consisting of illite and vermiculite, and a small amount of vermiculite, Al-vermiculite, goethite, and quartz. Clay mineral composition of Terra fusca-like and Mottled Terra fusca-like soils was similar to that of Rendzina-like soil except that the content of illite was lower in these soils. Terra rossa-like soil, on the other hand, mainly contained Al-vermiculite, metahalloysite, and gibbsite, indicating a highly advanced stage of hydrodxyaluminium interlayering. Differences in clay mineral composition from that of Rendzina, Terra fusca, and Terra rossa soils in the European countries were recognized, in that mont-morillonite was absent and hydroxyaluminium interlayeing actively proceeded in the soils studied here. This finding is considered to reflect the rapid alteration and intense hydroxyaluminium interlayering of clay minerals under the perhumid subtropical conditions.

• 社団法人日本土壌肥料学会の論文

著者

• Kaneko Shinji

  Institute For Global Environmental Strategies

• Nagatsuka Shizuo

  Institute Of Applied Biochemistry University Of Tsukuba

• Kaneko Shinji

  Institute Of Applied Biochemistry University Of Tsukuba

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