葛永刚;魏明建;

• 1:中国科学院研究生院
• 2:中国科学院成都山地灾害与环境研究所
• 3:宝鸡文理学院地理科学与环境工程系
• 4:首都师范大学资源环境与旅游学院

摘要(Abstract)：

末次冰期—间冰期气候旋回研究是过去的全球变化(PAGES)研究的三大重点之一,通过孢粉分析和热释光断代建立了北京西山末次间冰期植被的演化序列,研究了该地区古植被与古环境的演化规律。研究表明:北京末次间冰期植被演化经过了6个阶段,从古到今依次对应深海沉积MIS5e,5d,5c,5b,5a及末次间冰期向末次冰期的过渡期。末次间冰期森林分布于北京西山,暖期发育以鹅耳枥属、榆属、栎属、松属、桦属为主的落叶阔叶林或针阔叶混交林,冷期则主要发育以松科、桦科、蔷薇科、毛茛科、蒿属、菊科为主的森林草甸草原或森林草原,末次间冰期气候由早期的暖湿经过波动变化向温干、凉干演化。5e是末次间冰期的大暖期,其暖湿程度好于5c,5c又好于5a,而5d的气候环境优于5b。在MIS5e阶段北京西山植被的演潜过程可分为5个阶段,揭示气候存在千年时间尺度的不稳定性,5e1为水热组合最佳时期。由末次间冰期向末次冰期过渡的降温时期,存在一次明显的气候回返事件,热释光年龄为78.5~72.5 kaBP。对比研究表明北京西山末次间冰期气候环境与深海沉积、极地冰心记录具有很好的可比性,变化幅度小于极地地区,与黄土高原及青藏高原环境演化具有更大的相似性。

关键词(KeyWords)： 末次间冰期;MIS5;孢粉;古植被;古气候;古环境

Abstract:

Keywords:

基金项目(Foundation): 北京市自然科学基金项目(8002006);; 北京市教育委员会科技发展基金重点项目(KC200810028015)

作者(Author): 葛永刚;魏明建;

Email:

DOI:

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