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1990 Fiscal Year Final Research Report Summary

Studies on International Classification of Tephra-Derived Spodosols

Research Project

Project/Area Number 01470153
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 土壌・肥料
Research InstitutionTohoku University

Principal Investigator

SHOJI Sadao  Tohoku University, Dept. of Agriculture, Professor, 農学部, 教授 (10005605)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Tadashi  Akita Prefectural College of Agriculture, Dept. of Agriculture Lecturer, 講師 (80132009)
木村 和彦  東北大学, 農学部, 助手 (10183302)
ITOU Toyoaki  Tohoku University, Dept. of Agriculture Assistant, 農学部, 助手 (10176349)
Project Period (FY) 1989 – 1990
KeywordsAndisol / Spodosol / Andic Soil Properties / Spodic Criteria / Soil Taxonomy / Volcanic ash soil
Research Abstract

Tephra-detived Spodosols and Andisols share many important chemical properties which make it difficult to definitely separate the two orders (Ping et al. 1989 ; Shoji et al. 1988a, 1988b). In order to solve this serious problem, it has been proposed to exclude soils having andic properties from Spodosols (Arnold et al. 1989 ; Blume et al. 1989 ; National soil Survey Quality Assurance Staff (NSSQAS) 1989). However, we consider that all soils showing characteristic morphology of Spodosols should be classified as Spodosols irrespective of the kind of parent materials. According to our studies on volcanic ash soils in northeastern Japan and Alaska and Washigton, U. S. A., we proposed classification of tephra-derived Spodosols including the important items as follows : 1) To recognize tephra-derived Spodosols showing characteristic morphology of Spodosols, 2) To key out Spodosols after Andisols, 3) Emphasis on morphology over chemical spodic criteria, 4) Modification on albic color requirement for tephra-derived Spodosols, 5) Proposal of a new chemical spodic criterion (oxalate Al and a half Fe), and 6) Proposal of a procedure to differentiate a spodic horizon from a buried A horizon.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 庄子 貞雄: "Classification of TephraーderivedSpodosols" Soil Science. 150. 799-815 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 伊藤 豊彰: "Differentiation of a spodic horizon from a buried A horizon" Soil Science Society of AmericanJournal. 55. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] SHOJI, Sadao ;: "Classification of Tephra-derived Spodosols." Soil Science,. 150,. 799-815 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] ITO , Toyoaki ;: "Differentiation of a spodic horizon from a buried A horizon." Soil Science Society of American Journal.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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