陕西富平全新世古气候的初步研究

为了了解黄土高原中部全新世古气候演化特征,通过对陕西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、Ⅲ3个带,分别代表早、中、晚3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.

Preliminary Studies on Holocene Climatic In Fuping,Shaanxi Province

With the intention to comprehend the evolution characteristics of the prehistoric climate change of Holocene in the middle area of the loess plateau, the author divides the sporopollen diagram into three different zones according to the geological investigation, intensive sampling collected and sporopollen analysis of thirty-one samples from the cross section in the Fuping area, Shaanxi Province. These three zones represent early, middle and later periods respectively. The first zone is a combinatorial zone of Pinus-Compositae-Typha, with the herbaceous plant pollen predominating and with high content of conifer pollen. The second zone is also a combinatorial zone of Pinus-Quercus-Artemisia-Concentricystes, being characterized by increasing of arbor pollen and the decreasing of herbaceous pollen. The third is named as a combinatorial zone of Quercus-Pinus-Artemisia which is marked by herbal pollen increasing and arbor pollen decreaing. The result indicates that the vegetation of the early Holocene was a forest grassland-dry grassland, whose climate was dry and cool-dry and chill. The vegetation of the middle Holocene was forest grassland and aciculignosa and aeslilignosa grassland, and the climate was warm and wet. The vegetation of late Holocene was forest grassland and the climate was droughty and warmer or cool and droughty.