贺兰山东麓全新统洪积层孢粉组合及其环境意义

Palynological assemblage in Holocene diluvium of Helanshan eastern side and its environmental significance

在分析贺兰山东麓全新统洪积层孢粉含量和成分的基础上,建立并阐述了代表不同植被和气候类型的孢粉组合,进而对当时的环境和气候进行分析,得出全新统下部时期为荒漠草原化的森林植被,气候相对冷干;中部时期为森林草原植被,气候趋于旱化,属半干旱半湿润的温暖气候;上部时期为阔叶林,蕨类植物发育,气候温暖湿润.

On the basis of analysis content and ingredient palynological from Holocene diluvium of Helanshan eastern side,palynological assemblage were established and elaborated for representing different types of vegetation and climate,and then paleoenvironment and paleoclimate were analyzed. Results show that it was desert steppe forest in Early Holocene, and climate was cold and dry. And in the middle-Holocene, vegetation was forest steppe and climate tend to dry than before, and it was warm, semi-arid and semi-humid. But in the late Holocene, vegetation was broad-leafed forests, and ferns started to develope,climate was warm and humid.