非アロフェン質火山灰土の生成と特性

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タイトル別名
  • Genesis and properties of non-allophanic Andisols.
  • ヒ アロフェンシツ カザンバイド ノ セイセイ ト トクセイ

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Non-allophanic Andisols have mostly thick, very dark humus horizons, reflecting repetition of intermittent ash depositions and humus accumulation. It is impossible to differentiate these non-allophanic Andisols from allophanic ones according to morphology. Nonallophanic Andisols show absence or virtual absence of allophane and imogolite andabundance of 2: 1 layer silicates in the clay fractions. It is considered that formation of allophane and imogolite is inhibited by supply of a large quantity of organic matter from the vegetation under this weathering condition. Various hypotheses have been proposed concerning the sources of 2: 1 layer silicates.<BR>Non-allophanic Andisols show many unique physical and chemical properties such as low bulk density, high water retention, a large amount of available water, remarkable accumulation of organic carbon, high CEC dominated by variable charge, high fluoride reactivity, high phosphate retention, etc. These properties are also common to allophanic Andisols. However, there are significant dissimilarities between non-allophanic Andisols and allophanic ones. The former have Al-humus complex as the main active Al, very strong soil acidity, high KCl-exchangeable Al, which is toxic to plant roots, critical pH (H2O) of about 5, etc.

収録刊行物

  • 粘土科学

    粘土科学 24 (4), 152-165, 1984

    一般社団法人 日本粘土学会

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