南大東島の隆起サンゴ礁段丘上の土壌(第1報) : 日本におけるHaplic Lixisol, Typic Rhodudalfの存在

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Classification of the soils on the raised coral reef terraces of Minami-Daito Island, located in the humid subtropical region of Japan, were studied based on their general chemical properties and forms of free iron oxides. The results are as follows: 1) On the higher terraces, Haguue (45〜50 m.a.s.l), Red soil and Yellow soil are widely distributed. In the Red soil, the activity ratio of iron (Fe_o/Fe_d) ranges from 0.01 to 0.07, and the crystallinity ratio of iron [(Fe_d-Fe_o)/Fe_t ranges from 0.77 to 0.81, while in the Yellow soil, they range from 0.01 to 0.05 and from 0.78 to 0.85, respectively. The Red soil approximately corresponds to Haplic Lixisol close to Rhodic Nitisol (FAO-Unesco) or Typic Rhodudalf (USDA Soil Taxonomy). On the other hand, the Yellow soil corresponds to Haplic Acrisol or Typic Kandiudult. 2) On the lower terraces, Hagushita (15 m.a.s.l.), Terra rossa-like soil is distributed and approximately corresponds to Haplic Lixisol or Eutric Cambisol, Typic Hapludalf or Typic Eutrochrept, respectively. 3) On the sea side slope (20 m.a.s.l.), Terra fusca-like soil is distributed and corresponds to Chromic Luvisol or Typic Hapludalf. Consequently, the Red and Yellow soils distributed on the higher terraces of Minami-Daito Island are similar to the lateritic red soils widely distributed in subtropical South China, and considered to be older and more weathered than the Red-Yellow soils (Udults) which have hitherto been reported from Southwest Japan.
1997-06-30

南大東島の隆起サンゴ礁段丘上の土壌(第1報) : 日本におけるHaplic Lixisol, Typic Rhodudalfの存在

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