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热带亚热带土壤中存在着性质活跃且含量较高的氧化铁和氧化铝，其对土壤的物理、化学及肥力性质等有着深刻的影响，由于它们带有大量的可变电荷而使其行为在土壤表面电荷性质的研究中倍受关注［1～6］。就氧化铁对土壤表面电荷性质的影响，一些学者采用DCB处理脱去土壤中游离铁
In the subtropical soils, there are active and high-content iron oxides and aluminas which have a profound impact on the physical, chemical and fertility properties of soils. Due to their large amount of variable charges, they are responsible for their behavior in soils The study of surface charge properties has drawn much attention [1 ~ 6]. On the iron oxide on the soil surface charge properties, some scholars use DCB to remove soil iron