不同煤基腐殖酸对土壤锌淋洗效果的研究

为了研究不同煤基腐殖酸对土壤锌的淋洗效果，从而进一步探讨其调控土壤锌移动性的效果，采用土柱淋洗方法，研究了11种煤基腐殖酸及EDTA在2种淋洗方式（去离子水淋洗和5% KCl溶液淋洗）下对土壤Zn的淋洗效果的影响。结果表明：11种煤基腐殖酸处理下，去离子水淋洗液中Zn含量与CK2相比，1~10号煤基腐殖酸对土壤Zn都有一定的钝化作用，降低了Zn在土壤中的迁移性，而11号煤基腐殖酸增强了Zn在土壤中的迁移性，但11种煤基腐殖酸处理下的淋洗效果均低于EDTA处理下的淋洗效果。同时，5% KCl溶液对Zn的淋洗效果好于去离子水。

Effect of Different Coal-based Humic Acids on the Leaching of Zinc in Soil

In order to understand the effects of different oal-based humic acids on the zinc leaching in soil and to explore their regulation effects on the mobilization of zinc in soil in further. A soil column leaching method was adopted to study the effects of 11 kinds of coal-based humic acids and EDTA on the zinc leaching in soil under the two types of leaching way (deionized water leaching and 5% KCl solution leaching). The results showed that the coal-based humic acids of No. 1-10 had certain passivation effect on the zinc leaching in soil and reduced the migration of zinc in soil. The coal-based humic acid of No. 11 increased the migration of zinc in soil. But the leaching effects of the coal-based humic acids of No. 1-11 were all lower than that of EDTA. The effect of 5% KCl solution on zinc leaching in soil was better than that of deionized water.