北京西山末次间冰期植被演化与环境变迁研究  

Palaeo-vegetation and Palaeo-environment Change of Last Inter-Glacial Period in Xishan Mountain of Beijing

作　　者：葛永刚[1,2,3] 魏明建[4] 

机构地区：[1]中国科学院研究生院,北京100049 [2]中国科学院成都山地灾害与环境研究所,成都610041 [3]宝鸡文理学院地理科学与环境工程系,陕西宝鸡721013 [4]首都师范大学资源环境与旅游学院,北京100037

出　　处：《地质科技情报》2008年第6期5-12,共8页Geological Science and Technology Information

基　　金：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)

摘　　要：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。This paper presents the high-resolution sequence of vegetation change of the last inter-glacial period in Xishan Mountain, Beijing by pollen analysis and thermoluminescent dating technology with reconstruction of the palaeo-vegetation and palaeo-environment of this region. This research indicates that the palaeo-vegetation consists of 6 periods, respectively corresponding to, from early to later, MIS 5e,5d,Sc, 5b,Sa and the interim from MISS to MIS4. In the last inter-glacial period the forest still existed in the region, with the development of deciduous broad leaf forest or coniferous and broad leaf mixed forest in warm stages, and forest meadow-steppe or forest steppe in cold stages. The palaeo-climate changed with fluctuation from warm-humid in the early stage into temperate-dry or cool-dry in the late stage. It is revealed that the palaeo-climate and palaeo-environment of MIS5e, 5c, 5a changed worse in order, with 5e as the great warm stage in the period and the climate of 5d superior to that of 5b. The fact that the palaeovegetation of MIS5e in this area can be divided into 5 stages suggests the millennial instability of climate , which agrees with GRIP record, and that 5e1 shoud be the stage with the best temperature and precipitation. Moreover, there was a climate warming event during the interim from MISS to MIS4, with TL age of 78.5--72.5 kaBP. The comparison of its climatic and environmental records to those from SPECMAP, polar ice core, Tibet Plateau, Loess Plateau and the south sea of China shows that the climate and environment change of Xishan Mountain, Beijing is in good agreement with that of these areas, especially with that of Loess Plateau and Tibet Plateau.

关 键 词：末次间冰期 MIS5 孢粉 古植被 古气候 古环境 

分 类 号：Q914.5[天文地球—古生物学与地层学]