胶体是指直径在1—100nm之间的颗粒，但是实际上土壤中直径<1000 nm的粘性颗粒都具有胶体的性质，所以通常所说的土壤胶体实际上是指直径在1—1000 nm之间的土壤颗粒，它是土壤中最细微的部分，表现出强烈的胶体的特征。
土壤胶体中有机质的存在促进了胶体对酶的吸附。
Adsorption was enhanced by the presence of organic matter in soil colloids.
土壤含水量主要受土壤有机质、土壤质地和土壤胶体性质的影响。
Soil water content is decreased with the increase of soil water suction.
结果表明，氟污染使土壤黏粒的稳定性增强，土壤胶体的临界聚沉浓度增大；
The results indicated that fluorine pollution strengthened the stability of soil colloid and increased the critical flocculation concentration.
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