CATION EXCHANGE CAPACITY DERIVED FROM TETRAHEDRAL LAYER CHARGES INCREASE WITH DECREASING HYDROXY-AL POLYMERS IN 2:1 PHYLLOSILICATES THROUGH SOIL ACIDIFICATION IN ACIDIC FOREST SOILS (DYSTRUDEPTS) IN KINKI-DISTRICT, JAPAN

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概要

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• The cation exchange capacity (CEC) derived from octahedral layer charges (OLC) (CEC_<OLC>), the CEC derived from tetrahedral layer charges (TLC) (CEC_<TLC>), and the amount of Al as a hydroxy-Al polymer in interlayer sites (Al_<HIM>) were determined for natural soil clays fractionated from acidic forest soils (Dystrudepts) developed from sandstone and shale in Kinki-district of Japan. The CEC_<OLC>, determined by the reduced amount of CEC after Li-saturation and heating to 250℃ (Greene-Kelly test), was not correlated with Al_<HIM>, estimated from the amount of Al extracted with hot sodium citrate. In contrast, an approximate index value of CEC_<TLC>, represented by the residual CEC at pH 5.0 after subtracting the CEC_<OLC> was correlated negatively with Al_<HIM>, suggesting that CEC_<TLC> is largely responsible for the stabilization of hydroxy-Al polymers in 2:1 phyllosilicates.

• 日本粘土学会の論文

著者

• KOSAKI Takashi

  Department of Tourism Science, Tokyo Metropolitan University

• Kosaki Takashi

  Department Of Agro-environmental Science Obihiro University Of Agriculture And Veterinary Medicine

• Funakawa Shinya

  Department Of Environmental Science And Technology Graduate School Of Agriculture Kyoto University

• NAKAO ATSUSHI

  Department of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University:Department of Life and Environmental Sciences, Kyoto Prefectural University

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