Differentiation of a spodic horizon from a buried A horizon

T. Ito, S. Shoji, Y. Shirato, E. Ono

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8 Citations (Scopus)


Andisols with a thin ash layer or C horizon are morphologically so similar to Spodosols that there is a danger of confusing the ash layer for an albic horizon or vice versa. In order to solve this problem, it is necessary to differentiate spodic horizons from buried A horizons underlying the ash layer or C horizon. The amounts of organic C (OC), pyrophosphate-extractable C (Cp), and fulvic acid C (Cf) were determined in 39 tephra-derived pedons and six non-tephra-derived pedons from the USA, New Zealand, Chile, Ecaudor, and Japan. The data indicated that the combination of Cp/OC ratio ≥0.50 and Cf/Cp ratio ≥0.50 is a reliable criterion to differentiate the spodic horizons from the buried A horizons. -from Authors

Original languageEnglish
Pages (from-to)438-442
Number of pages5
JournalSoil Science Society of America Journal
Issue number2
Publication statusPublished - 1991 Jan 1

ASJC Scopus subject areas

  • Soil Science


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