硬磐层硬磐层是一种被二氧化硅胶结成的亚表层,其风干土层碎块在水中或HCl中长期浸泡不消散。硬磐层随二氧化硅的胶结程度而异,并且一般含有氧化铁、碳酸钙等附加胶结剂,故外表形态也各有不同;但所有硬磐层都具有很坚实或极度坚实的湿结持,即使长时间处于水湿情况下也仍然是脆性的。这种土层在半干旱和干旱气候条件下可渐次变为石化钙积层,在湿润气候条件下变为脆磐或非胶结的土状物质。 Hard Rock Layer Hard Rock Layer is a sub-surface layer of silica gel, the dried soil fragments in the water or HCl long-term soak does not dissipate. The hardness of the hard-pan varies depending on the degree of cementation of the silica, and generally includes an additional binder such as iron oxide, calcium carbonate, etc. Therefore, the appearance of the hard-pan layer is also different, but all of the hard-pan layers have a very solid or extremely firm wet- , Is still brittle even under prolonged wet conditions. This soil layer can gradually change into a layer of petrified calcium under semi-arid and arid climates and become brittle or non-cemented soil material under wet climatic conditions.