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选取黄壤、紫色土和石灰性土3种土壤为研究对象,采用一次平衡吸附法,研究了pH、有机质对镁吸附的影响.结果表明,不同pH和有机质条件下,土壤对镁的最大吸附量有较大差异,黄壤和紫色土受pH影响较明显,在pH3.5~7.5这个范围,黄壤对镁的最大吸附量变化在1 336.25g~2 054.77 mg/kg,紫色土在1 417.04~2 025.38 mg/kg,石灰性土变化不大.去有机质后,黄壤、紫色土和石灰性土对镁的吸附能力下降,最大吸附量分别减少363.31,148.72,120.00 mg/kg.Langmuir方程能很好的拟合土壤对镁的吸附过程.
Three kinds of soils, yellow soil, purple soil and calcareous soil, were selected as the research object, and the effect of pH and organic matter on the adsorption of magnesium was studied by a single equilibrium adsorption method. The results showed that under the condition of different pH and organic matter, There is a big difference between them. The pH value of yellow soil and purple soil is more obvious. Under the range of pH 3.5 ~ 7.5, the maximum adsorption amount of magnesium in yellow soil varies from 1 336.25g ~ 2 054.77 mg / kg, purple soil is 1 417.04 ~ 2 025.38 mg / kg, little change in calcareous soil.The adsorption capacity of magnesium to yellow soil, purple soil and calcareous soil decreased after removing organic matter, and the maximum adsorption capacity decreased by 363.31,148.72 and 120.00 mg / kg, respectively. The fitting process of soil magnesium adsorption.