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1932年李四光在进行宁镇山脉的地质研究时,将江苏的南京、浦口、句容、镇江附近分布于低阶地的类似黄土的物质称为下蜀系或下蜀粘土。这种类似黄土的物质从南京沿长江河谷向西延伸,直到洞庭湖区,都有断续的分布,在安徽省的江淮丘陵地区,分布尤为广泛和集中,成为各种土壤发育的母质。虽有多数学者对它的成因、时代与地形上的诸问题及其基本的理化特性做过一些研究,但是对其土壤的发育和农业生产特性尚缺乏系统的了解。在安徽省的土壤普查工作中,已经查明由下蜀地层发育的土壤,基本上可以分为三种类型:马干土(黄泥土)、白土和黑泥土(黑萝卜土、青钢泥)。在完成了全省的土壤普查总结工作以后,目前有可能对它们进行比较深入的研究。
In 1932, Li Siguang conducted a geological study of the Ningzhen Mountains. He called the loess-like material distributed in the lower terrain near Nanjing, Pukou, Jurong, and Zhenjiang in Jiangsu Province as the Lower Shu line or the lower Shu line. This loess-like material extends westward along the Yangtze River valley from Nanjing to the Dongting Lake area, with intermittent distribution. It is widespread and concentrated in the Jianghuai hilly area of Anhui Province and becomes the parent material of various soil development. Although most scholars did some research on its causes, age and topography and its basic physical and chemical properties, there is no systematic understanding of its soil development and agricultural production characteristics. In the soil census work in Anhui Province, it has been ascertained that the soil developed from the Shu area can be basically divided into three types: clay soil (yellow soil), clay soil and black soil (black radish soil, Qinggang clay) . After the completion of the province’s soil census summary work, it is currently possible for them to conduct more in-depth study.