【摘要】 目的探究黄土高原中部晚更新世的古气候演化特征,揭示其变化规律。方法通过对陕西富县剖面的地质调查、密集采样和54个样品的孢粉分析进行综合研究。结果将孢粉图式划分为Ⅰ、Ⅱ、Ⅲ3个带,分别代表S1、L1和S03个形成时期的孢粉带:Ⅰ带为榛-菊-蒿组合带,以草本植物孢粉占多数,乔木植物花粉出现高峰为特征;Ⅱ带为菊、蒿优势带,以草本植物花粉占优势,乔木植物花粉显著减少为特征;Ⅲ带为松-藜-中华卷柏增长带,以松、藜、中华卷柏显著增加,乔木植物明显增长为特征。结论S1形成时期植被为疏林草原,气候温暖较湿;L1形成时期植被为干草原,气候冷干;S0形成时期植被为森林草原,气候温凉干旱。更多还原

【Abstract】 Aim With the intention to comprehend the evolution characteristics of the prehistoric climate of the late Pleistocene in the middle area of loess plateau.To reveal the changing regularity of the climate.Methods According to the geological investigation,intensive samples were chosen and sporopollen analysis was made on fifty-four samples of the cross section in Shaanxi-Fu County.Results The sporopollen diagram was divided into three different zones is divided.The three zones represent S1,L1 and S0 sedimentary periods respectively.The first zone is combinatorial zone of Corylue-Compositae-Artemisia,with the characteristic that herbaceous plant pollen is predominant and the arbor plant pollen is of high content.The second zone is combinatorial zone of Compositae-Artemisia,with the characteristic that herbaceous plant pollen is predominant and the decrease of arbor plant pollen.The third which is named combinatorial zone of Pinus-Chenopodiaceae-Selaginella tamariscina is marked by the increase of Pinus,Chenopodiaceae,Selaginella tamariscina pollen and the increase of arbor pollen.Conclusion The experiment indicates that the vegetation of S1 sedimentary periods was savannah forest grassland,climate was warm and weter;The vegetation of L1sedimentary periods was dry grasslands,climate was cold and dry;The vegetation of S0 sedimentary periods was forest grassland.climate was warmer,cool and droughty.更多还原