【摘要】 本文通过山西大同地区黑山南四沟剖面、东水头剖面及小北庄剖面的孢粉资料，对该区０．８Ｍａ以来的自然环境进行研究探讨。结果表明，该时期植被经历了森林—森林草原—草原—荒漠草原４个发展阶段，与其相对应的气候变化有３个气候旋回，９个亚旋回，各气候旋回都是以冷干开始，温湿结束。更多还原

【Abstract】 A sporopollen analysis of the Dongshuitou section, Xiaobeizhuang section and Nansigou section of the Heishan hill, Datong, Shanxi, shows that the vegetation since 800 ka B P has gone through four stages developing from forest through sylvosteppe and steppe to desertsteppe, Corresponding to the changes of paleoclimate, i.e. three climatic cycles, including nine subcycles, each beginning with a cold and dry climate, and ending in a warm and humid one.更多还原