Clay Mineralogical Composition of Representative Paddy Soils in Southern Part of Northeastern Japan

DOI Web Site 2 Citations 21 References
  • SANO Oki
    Field Science Center, Graduate School of Agricultural Science, Tohoku University:(Present office)Bicchu General Service Bureau of Okayama Prefecture
  • ITO Toyoaki
    Field Science Center, Graduate School of Agricultural Science, Tohoku University
  • ANDO Tadashi
    Shonai Branch Office of Yamagata Prefecture
  • NANZYO Masami
    Graduate School of Agricultural Science, Tohoku University
  • SAITO Genya
    Field Science Center, Graduate School of Agricultural Science, Tohoku University
  • SAIGUSA Masahiko
    Field Science Center, Graduate School of Agricultural Science, Tohoku University:(Present office)Toyohashi University of Technology

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Other Title
  • 南東北地方の代表的な水田土壌の粘土鉱物組成
  • ミナミトウホク チホウ ノ ダイヒョウテキ ナ スイデン ドジョウ ノ ネンド コウブツ ソセイ

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Abstract

Paddy soils (225 points) in southern part of northeastern Japan were divided according to clay mineralogical composition. In northern part of Miyagi Prefecture, semi-smectitic paddy soils were dominant in alluvial lowlands derived from Kitakami River and Eai River. Most paddy soils in alluvial lowlands derived from Hasama River and Yoshida River were dominated by smectite (Smectitic). Mixed mineralogy type soils, which had low content of smectite, existed in valley bottoms in Kitakami Mountains. In southern part of Miyagi Prefecture, smectitic soils were dominant in alluvial lowlands of Nanakita River and Natori River. Semi-smectitic soils were observed in alluvial lowlands of Abukuma River. In Shonai Plain, northwestern part of Yamagata Prefecture, smectitic paddy soils existed in alluvial lands near Mogami River. Paddy soils of semi-smectitic type and 2:1-2:1:1 intergraded mineral type were observed in the lowlands derived from Aka River and Nikko River. In Yamagata Basin, semi-smectitic and smectitic soils were distributed in alluvial lowlands near Mogami River and Su River. Paddy soils in Yonezawa Basin were diverse in clay mineralogical composition. In Aizu Basin, western part of Fukushima Prefecture, smectitic and semi-smectitic paddy soils were relatively dominant. Mixed and semi-smectitic paddy soils were observed in Kooriyama Basin and southern part of Fukushima Basin, respectively. In valley bottom of Abukuma Mountains, most of paddy soils were classified into mixed mineralogy type. In coastal region near Pacific Ocean, clay mineralogical composition types were different depending on the geology of upper reach of each river. Tertiary sedimentary rocks or tuffs, which contain substantial amount of smectite, were distributed in upper reaches of many alluvial paddy soils in the southern part of northeastern Japan.

Journal

  • Pedologist

    Pedologist 54 (2), 83-92, 2010-12-31

    Japanese Society of Pedology

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