Soluble Silica in a Tephra-Derived Spodosol in the Mountainous Region of Chichibu, Japan
スポンサーリンク
概要
- 論文の詳細を見る
Si sorption and release characteristics of a tephra-derived Spodosol in the mountainous region of Chichibu, Japan, were studied, and cation-exchange resin extraction of protoimogolite was tested. The upper compartment and the lower compartment of the Bhs/Bs interface differed considerably in their reactivity for H_4SiO_4. The upper compartment (Oa, E, Bhs1, and Bhs2 horizons) showed a weak affinity for H_4SiO_4.These horizons gave zero-order H_4SiO_4 release, and the initial stage of H_4SiO_4 release was well described by the parabolic diffusion law. These results suggest that the upper profile contains a large amount of free Si and acts as a Si pool. Especially, the Oa horizon did not show any H_4SiO_4 adsorption in a 0-3 mmol L^<-1> H_4SiO_4 solution, and gave a much larger H_4SiO_4 release rate. The lower compartment (Bs1 and Bs2 horizons) which contains allophane/imogolite showed a strong affinity for H_4SiO_4. The H_4SiO_4 release rate of these horizons was described by the Elovich equation. These findings suggest that in the lower profile, the H_4SiO_4 concentration is well controlled by the reaction with surface Al-OH groups of allophane/ imogolite and hydroxy-interlayer minerals. Cation-exchange resin, Chelex 100, extracted a very small amount of Si from only the Bhs1 and Bhs2 horizons, suggesting that a trace amount of protoimogolite accumulated in these horizons. The protoimogolite was probably complexed with humic substances.
- 社団法人日本土壌肥料学会の論文
著者
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Nakahara Osamu
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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SAKAGAMI Kan-ichi
Faculty of Agriculture, Tokyo University of Agriculture and Technology
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HAMADA Ryunosuke
Faculty of Agriculture, Tokyo University of Agriculture and Technology
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Hamada Ryunosuke
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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Sakagami Kan-ichi
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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