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作 者 ：王旭东;胡田田;张一平

期 刊 ：植物营养与肥料学报 2001年 7卷 2期 页码：139-144

关键词：胡敏酸级分；Fe2+；络合作用；施肥；

Keywords:humicacidfraction, complexationcharacteristic, Fe2+, fertilizerapplication,

摘 要 ：采用酒精沉淀法对不同施肥处理胡敏酸进行分级 ,在研究胡敏酸级分组成变异以及各级分性质变化的基础上 ,研究了胡敏酸各级分与Fe²⁺的络合特征。结果表明 ,胡敏酸各级分随级分数的增大芳构化度逐渐降低 ,分子结构趋于简单。在所分离的 7个级分中 ,均以级分 3与Fe²⁺的络合能力最强。从级分 1到级分 3络合能力逐渐增强 ,级分 3到级分 7络合能力逐渐降低。胡敏酸A型级分的络合能力一般大于P型。但若A型级分芳构化度过高 ,也存在A型级分小于P型现象。Rp型级分的络合能力明显比A型、P型级分小。不同施肥处理胡敏酸原样与Fe²⁺络合能力差异与其级分组成变异以及各级分的络合能力有密切关系

Abstract:Humic acids from different fertilization were fractionated by alcohol precipitation technique, complexation characteristic of the fractions with Fe²⁺ were studied on the basis of studying the properties of the fractions The results showed that the condensation degree of the fractions decreased and the structure became simpler with the fractional number increase Complex ability of the third fraction was the highest among all the 7 fractions, which increased from fraction 1 to fraction 3, and decreased from fraction 3 to fraction 7 This revealed that it was not benefit for complex if the molecular structure of the fraction of humic acid was too simple or too complicated, existing an optimum molecular state among the fractions for complex The complex ability of A type fraction of humic acid was higher than that of P type, if the A type fraction was too complicated, the opposite was true The complex ability of Rp type fraction of humic acid was lower than that of A or P type significantly The difference on complex ability of humic acids with different fertilization was related to their fractional composition variation and their fraction‘s complex ability

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