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通过对长安少陵塬双竹村S4古土壤的野外观察、元素分析及粒度分析,讨论其环境变化。结果表明:(1)根据剖面特点、元素淋溶迁移特征及脱离粘化层的钙淀积层,可判断S4属于酸性淋溶土,其剖面构型为Bts-Bs-BC-Bck-C;(2)根据S4的颜色、质地、结构及铁质胶膜和钙淀积层的特点,但又不具明显的铁铝化特征,可判断S4可能相当于现今中国北亚热带的黄棕壤;(3)根据CaCO3迁移深度、风化淋滤黄土层厚度及红色铁质粘土胶膜的最大深度与江苏六合地区现代黄棕壤的剖面很相似,可判断当时西安地区的年均温、年均降水量与六合地区较接近。
Through the field observation, elemental analysis and grain size analysis of S4 ancient soils in Shuangzhumu of Changling Shaolingyuan, the environmental changes were discussed. The results show that: (1) S4 belongs to acidic leaching soil and its section configuration is Bts-Bs-BC-Bck-C according to the features of the sections, leaching characteristics of the elements and the calcium deposit detached from the clay layer. (2) According to the color, texture and structure of S4 and the characteristics of iron film and calcium deposit, but without significant Al-Fe-Al features, it can be concluded that S4 may be equivalent to the yellow-brown soil in North China subtropical nowadays; 3) According to the migration depth of CaCO3, the thickness of the aeolian leaching loess layer and the maximum depth of the red iron clay film are similar to those of the modern yellow brown earth in the Liuhe area of Jiangsu Province, and the annual average temperature and annual precipitation Closer to the Luhe area.