陕西北部地区晚更新世的植被与气候  

Vegetation and climate during the Late Pleistocene in the northern area of Shaanxi

作　　者：李秉成[1] 柯曼红[1] 孙建中[1] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054

出　　处：《西北大学学报（自然科学版）》2009年第4期686-689,共4页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(49971096)

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。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 SI combinatorial zone of Corylue-Compositae-Artemisia, nant and the arbor plant pollen is of high content. with the characteristic that herbaceous plant pollen , L1 and So sedimentary periods respectively. The first zone is with the characteristic that herbaceous plant pollen is The second zone is combinatorial zone of predomi Compositae-Artemisia, 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 weter; The vegetation of L1 sedimentary sedimentary periods was savannah forest periods was dry grasslands, climate was grassland, climate was warm and cold and dry; The vegetation of SO sedimentary periods was forest grassland, climate was wanner, cool and droughty.

关 键 词：植被与气候 晚更新世 陕西北部地区 

分 类 号：P462[天文地球—大气科学及气象学]