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采用酒精沉淀法，把不同施肥处理土壤胡敏酸分为7个级分，研究了胡敏酸不同级分与钙饱和蒙脱石的吸附特征。结果表明，蒙脱石对胡敏酸各级分的吸附可用单表面Langmuir、双表面Langmuir和Freundlich方程来描述。各级分的吸附量和吸附强度不是随级分数变化单一递增或递减，在7个级分中，级分4、3的吸附量和吸附强度较大，是吸附最佳级分。说明级分4、3具有与蒙脱石胶体最佳的成键吸附状态，是吸附最佳分子状态。有机肥处理，吸附最佳级分的吸附性状（吸附量和吸附强度）优于化肥、无肥处理。
The alcohol precipitation method was used to divide the humic acid into seven fractions under different fertilization treatments. The adsorption characteristics of different fractions of humic acid and calcium-saturated montmorillonite were studied. The results show that montmorillonite adsorption of humic acid fractions can be described by single-surface Langmuir, double-surface Langmuir and Freundlich equations. The adsorption amount and adsorption strength of each fraction did not increase or decrease with the increase of fraction. In the seven fractions, the adsorption capacity and adsorption strength of fractions 4 and 3 were the best. It shows that Fraction 4,3 has the best bond adsorption state with the montmorillonite colloid, which is the best adsorption molecular state. Organic fertilizer treatment, adsorption of the best fractions of the adsorption properties (adsorption capacity and adsorption strength) than fertilizer, no fertilizer treatment.