胡敏酸对土壤和矿物粘粒分散的影响

HUMIC ACID EFFECT ON DISPERSION OF SOIL AND MINERAL CLAY

研究了土壤胡敏酸（Humicacid）对红壤和黄棕壤以及高岭矿和蒙脱矿粘粒分散的影响。研究结果表明：土壤HA对Na+饱和的土壤及矿物粘粒分散作用很大。用H2O2除去土壤有机质后，粘粒分散明显下降。然而，添加少量HA后，又能显著地提高粘粒的分散性。这种现象在两种土壤中，红壤表现更为突出。Na+饱和的高岭矿粘粒分散性很差，而蒙脱矿粘粒分散性很强，这与它们所带电荷量有关。但是，添加少量HA后，高岭矿粘粒分散性急剧提高，而蒙脱矿的变化却很小。试验结果进一步表明：有机质HA对土壤和矿物粘粒分散作用受矿物类型的影响。

In this study, effects of humic acid(HA) on the dispersion of soil (red soil andyellow-brown soil) and clay minerals (kaolinite and montmorillonite) were investigated.The results showed that HA played an importmant role in dispersion of soil and clayminerals. The removal of soil organic matter with H,O, obviously decreased the claydispersion, whereas the addition of HA led to a great increase in the clay dispersion.The dispersion of Na-kaolinite clay was very week, but that of Na-montmorilloniteclay was very strong, which were related to the resources and amounts of the charges.On the other hand, with the addition of HA, the dispersion of Na-kaolinite clay wasimproved abruptly, but that of Na-montmorillonite clay changed little. The resultsfurther indicated that HA effect on clay dispersion was affected by the mineral types.