银川盆地晚第四纪环境特征

依据银川盆地８个钻孔的第四系的研究，对该区近１２万年的自然环境特点进行了探讨。结果表明：该时期植要是在森林草原与草原类型间频荒漠草原４个发展阶段，其中短时间尺度的植被演替主要是在森林草原与草原类型间频繁发生。

ENVIRONMENT FEATURES OF YINCHUAN BASIN IN LATE QUATERNARY PERIOD

Based on the achievements in the Quaternary research of eight 300m-depth drill holes in Yinchuan Basin(including paleogeomagnetism, 14C dating,spore-pollen analysis and the structure analysis in surface of quartz grains),the changes of natural environment of Yinchuan Basin in 120ka are studied in this paper.It indicates that paleo-vegetation have gone through forest-sylvosteppe-steppe-desert steppe stages,in these stages, the short-time vegetation succession happened frequently between sylvosteppe and steppe.Correspondingly,paleoclimate had gone through warm/wet -cool/wet -cold/dry warm/dry process,and the match of cold/warm and dry/wet climates was very complicated in the second flucturate of climate.The evolutions of vegetation and climate showed that dry environment happening was of stage character. In geology history,the short-term drought began from 30kaB.P.,and the climate was cold/dry before this period,and was warm/dry after this period.