ty Behavior of Soil Colloidal Suspensions in Relation to Sequential Reduction of Soils : II. Turbidity Changes by Submergence of Paddy Soils at Different Temperatures
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概要
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Flocculation and dispersion of clay particles in in vitro waterlogged soils at 8, 18, 28, and 38℃ were investigated with some indications of soil reduction. Above 28℃, waterlogging for 1-week in the six soils caused a significant decrease in the turbidity of their colloidal suspensions. The decrease in the turbidity, i.e., the fioceulation of the clay particles, was evident with (i) a decrease of redox potential (Eh) of the soils, (ii) an increase in the values of electric conductivity (EC) and water-soluble eations (WSCs: Fe^<2+>, Ca^<2+>, Mg^<2+>, NH_4^+ etc.) in the solutions, and (iii) an increase in the amounts of volatile fatty acids (VFAs: acetic, propionic, and n-butyrie acids) in the soils. Soil incubation at 8℃ retarded the decrease in Eh, the increase in the values of EC, WSCs, and VFAs, and the decrease in the turbidity. At 38℃, samples of four soils waterlogged for 4 weeks showed a low turbidity with a low Eh, and high values of EC, WSCs, and VFAs. The samples of other two soils, however, exhibited a significant increase in the turbidity, viz. the dispersion of clay particles, with an increase in pH and decrease in the values of EC, WSCs, and VFAs under low Eh. The observed flocculation and dispersion of clay particles in the waterlogged soils were discussed in relation to chemical changes under sequential reduction of soils, particularly change in ionic strength of soil solutions largely due to the (i) dissolution and precipitation reactions related to Fe^<2+> and Fe(III) and (ii) cation exchange reactions between Fe^<2+> and other exchangeable cations on clay surfaces.
- 一般社団法人日本土壌肥料学会の論文
著者
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Horikawa Yukiya
Faculty Of Agriculture Kochi Univers
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Li Zhonghai
Faculty Of Agriculture Kochi University:(present Address)department Of Non-timber Forestry Central S
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Li Zhonghai
Faculty Of Agriculture Kochi University
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