【摘要】 为了了解黄土高原中部近一万年以来古气候演化特征,通过对关中富平剖面的地质调查、密集采样和31个样品的孢粉分析,将孢粉图式划分为Ⅰ、Ⅱ、Ⅲ三个带分别代表早、中、晚三个时期的孢粉带:Ⅰ带为松-菊-香蒲组合带,以草本植物花粉占优势,针叶树植物花粉含量较高为特征;Ⅱ带为松-栎-蒿-环纹藻组合带,以乔木花粉增加,草本植物花粉减少为特征;Ⅲ带为栎-松-蒿组合带,以草本植物花粉增加,乔木花粉减少为特征。结果表明:早全新世植被为森林草原-干草原,气候干凉-干冷;中全新世植被为森林草原与针阔叶混交林草原,气候温暖半湿润;晚全新世植被为森林草原或疏林草原,气候干旱偏暖-温凉干旱。更多还原

【Abstract】 With the intention to comprehend the evolution characteristics of the prehistoric climate of recent 10Ka in the middle area of Loess Plateau,the sporopollen diagram wes divided into three different zones according to the geological investigation,intensive samples chosen and sporopollen analysis to thirty-one samples of the cross section in Shaanxi-Fuping.The three zones represent early,middle and later periods respectively.The first zone is combinatorial zone of Pinus-Compositae-Typha,with the characteristic that herbaceous plant pollen is predominant and the conifer pollen is of high content.The second zone is combinatorial zone of pinus-Quercus-Artemisia-Concentricystes,which is characterized by the increase of arbor pollen and the decrease of herbaceous pollen.The third which is named combinatorial zone of Quercus-Pinus-Artemisia is marked by the increase of herbal pollen and the decrease of arbor pollen.The results indicated that the vegetation of early Holocene was forest grassland-dry grassland,climate was dry and cool-dry and cold.The vegetation of middle Holocene was forest grassland and aciculignosa and aeslilignosa grassland,climate was warm and semi wet.The vegetation of late Holocene was forest grassland,climate was droughty and warmer,cool and droughty.更多还原