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This article in SSSAJ

  1. Vol. 54 No. 4, p. 1173-1178
     
    Received: June 2, 1989


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doi:10.2136/sssaj1990.03615995005400040043x

Clay Minerals of Two Eutrandepts of Hawaii, Having Isohyperthermic Temperature and Ustic Moisture Regimes

  1. K. Wada ,
  2. Y. Kakuto and
  3. H. Ikawa
  1. Dep. of Agric. Chemistry, Kyushu Univ, 46, Fukuoka 812, Japan
    Dep. of Agronomy and Soil Science, Univ. of Hawaii at Manoa, Honolulu, HI 96822

Abstract

Abstract

Clay minerals of two pedons of Naalehu soils from Hawaii were studied by a combination of methods. According to Soil Taxonomy, they are classified as medial, isohyperthermic Typic Eutrandept. In the Andisol proposal, Naalehu-1 is not an Andisol because its P retention is <85%, but Naalehu-2 is classified as an Andisol because it meets all of the definitions of andic materials. Their clay content was high (49–85%), with no significant difference between the two soils. The Naalehu-2 soil clays, however, had higher contents of oxalate-oxalic acid soluble aluminosilicates and Fe oxides than the Naalehu-1 soil clays. These clays also showed halloysite (1.0 nm), concentric spherules and curled flakes, and possibly hollow spherical aluminosilicates having a close structural relation with allophane. The Naalehu-1 soil clays, on the other hand, showed smectite, halloysite (1.0 nm), and their interstratified species. Both soils contained X-ray-detectable amorphous Fe oxides in the clay and poorly crystalline maghemite, olivine, and plagioclase in the silt and sand fractions. The importance of the soil-forming factors of parent material, climate (soil moisture and soil temperature), and age was inferred from comparison of the smectite and/or halloysite mineralogy of the isohyperthermic Naalehu soils with the imogolite and/or allophane mineralogy of the isothermic and isomesic Maui soils studied earlier.

Joint contribution from Kyushu Univ. and Univ. of Hawaii at Manoa.

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