1. Illuviation is an important process in soil formation and nutrient cycling.
土壤中的illuviation是土壤形成和营养循环的重要过程。

2. The illuviation of clay and minerals into the subsoil layer can greatly affect soil fertility.
黏土和矿物质的沉淀对亚土层的illuviation会对土壤肥力产生很大影响。