In ABC soil,the second or subsurface zone of soil made of clay and oxidized materials and organic matter obtained from the A-horizon by leaching,subsoil.

• B层，淀积层在分A、B、C层位土壤中的第二层即表层之下的土壤部分，由粘土、氧化物质和从A层位通过过滤得到的有机物组成，下层土。