Changes in Cationic Composition of Soil Solution Associated with Changes of Water Content : A Numerical Study
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概要
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We carried out a series of numerical simulations to evaluate the changes in ionic activity ratios, (Ca^<2+>)/(K^+)^2, (Ca^<2+>)/(Na^+)^2, (Mg^<2+>)/(K^+)^2, and (Mg^<2+>)/ (Na^+)^2, associated with the changes of water content. We considered cation exchange reaction, complexation with sulfate, anti gypsum precipitation as factors affecting the soil solution composition. All the ionic activity ratios decreased as water content decreased to a significant extent depending on the values of effective cation exchange capacity (ECEC), and eation exchange selectivity. Smaller ECEC values and lower selectivity for potassium resulted in a larger magnitude of change. Formation of calcium and magnesium sulfate complexes anti gypsum precipitation exerted a small effect on the changes in the activity ratios. Based on the simulation, we concluded that these activity ratios should not be regarded as constants and are not reliable tools to predict the changes in cationic composition of soil solution at different water contents.
- 社団法人日本土壌肥料学会の論文
著者
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Wada Shin-ichiro
Department Of Agricultural Chemistry Kyushu University
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Wada Shin-ichiro
Department Of Agricultural Chemistry
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Otani Takashi
Department Of Agricultural Chemistry Kyushu University
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