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玉米植株残体施入土壤后,土壤胡敏酸的一系列理化性质发生了改变:胡敏酸的阳 离子交换量增加,色调系数提高,相对色度降低,抗絮凝能力增强,电泳速度加快,并且胡敏酸由 A型向B型、P型和Rp型转变。这些性质发生改变最大的时期皆发生在玉米植株残体施入土壤 后的第60~75天。就玉米植株残体不同部分施入土壤后对上述性质变化的影响而言,玉米秸秆 的作用大于玉米根茬。
A series of physical and chemical properties of soil humic acid changed when maize plant residues were applied to the soil: the cation exchange capacity of humic acid was increased, the hue coefficient was increased, the relative chroma was decreased, the deflocculation ability was enhanced, the electrophoresis speed was accelerated, and Humic acid from type A to type B, P type and Rp type transition. The most varied periods of these properties occurred on the 60th to 75th days after corn plant residues were applied to the soil. The effect of corn stalks on corn stover is better than that of corn stalks when different parts of corn plant residues are applied to the soil.