对雁北地区已定名为“栗钙土”土类的土体中有一富含碳酸钙的层次——白干土层进行研究,结果表明,白干土层是白垩系风化物及奥陶系石灰岩碎屑沉积、粉化而成的一层冲积洪积或湖积物,是地质作用的产物,并从七个方面论证了这一观点,为此应将“栗钙土”归属于栗褐土的几个土属.本文还提出了改良这种低产土壤的措施. The results show that the white dry soil is Cretaceous weathering material and the Ordovician limestone crushed in the soil with the soil named “chestnut soil” in Yanbei area. A layer of alluvial or alluvial sediments and chalcogenites formed by the deposition of crumbs is the result of geological processes. This point is demonstrated from seven aspects. For this purpose, “chestnut soil” should be attributed to the chestnut-cinnamon soil Several soil genus.This paper also proposed measures to improve this low yield soil.