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胶膜(Cutans)是与土壤的孔隙、裂隙、孔道、土胚(Ped)和骨髂碎屑颗粒的自然表面相结合或相适应的一种可识别的土壤形成物。若将土壤物质分为骨骼颗粒(Skeleton Grains)和细土物质(Plasma),粘粒胶膜则是细土物质中粘粒组分的扩散、移动或淀积形成的聚集物,或是粘粒组分原地变化形成的分离物。粘粒胶膜的研究,对于介决如何区别土壤中听发生的就地粘化与粘粒的机械移动和淀积这一尚在争论的问题,乃至鉴别土壤发生程度和土壤发生类型有重要意义。
Cutans are a recognizable soil form that binds to or adapts to the natural surfaces of soil pores, fissures, tunnels, Ped and bone-gravel particles. If the soil material is divided into Skeleton Grains and fine soil material, the clay film is an aggregate formed by the diffusion, migration or deposition of clay components in the fine-grained soil, or the clay Components in situ changes in the formation of isolates. The study of clay films has been debated as to how to distinguish between in-situ viscosities and viscosimetric mechanical migration and deposition in soils, as well as the identification of soil occurrence and types of soil formation .