SOIL GENESIS ON THE RAISED CORAL REEF TERRACES OF ISHIGAKI- AND OKINAWA-ISLANDS IN THE RYUKYU ISLANDS, JAPAN : I. Relations among Soils and Geomorphic Plains and Chronosequential Change of Soil Chemical Properties

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Soil forming processes on the raised coral reef terraces under humid sub-tropical maritime climate were investigated in Ishigaki- and Okinawa-islands in the Ryukyu Islands. Analyses of soil morphology and soil chemical properties showed that there is a close relationship between soil development and the relative age of the terrace plains, as follows: The soils develop from Coral Limestone Lithosols (Lithic Udorthents) on the lowest terraces, through Rendzina-like soils (Typic Rendolls) on the lower terraces, Terra fusca-like soils (Lithic Eutrochrepts) on the lower middle terraces, Mottled Terra fusca-like soils (Aquollic Hapludalfs) on the higher middle terraces and finally to Terra rossa-lke soils (Mollic Hapludalfs) on the limestone plateaux corresponding to the higher terraces. However, the status of free iron oxides in all these soils is similar to that of Red soils, reflecting the bio-climatic conditions of the humid sub-tropics. It appears therefore necessary to develop criteria that may enable to distinguish these soils from those in the temperate region.
社団法人日本土壌肥料学会の論文