| 晚冰期以来月亮湖孢粉记录反映的古植被与古气候演化 |
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| 引用本文： | 伍婧,刘强.晚冰期以来月亮湖孢粉记录反映的古植被与古气候演化[J].地球科学,2012,37(5):947-954. |
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| 作者姓名： | 伍婧 刘强 |
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| 作者单位： | 1.北京大学城市与环境学院, 北京 100871 |
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| 基金项目： | 科技部"973计划"项目2010CB950201国家自然科学基金面上项目40872206 |
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| 摘 要： | 地处季风/非季风影响过渡地带的月亮湖是大兴安岭中段阿尔山-柴河火山区中的一个火山口湖.其长8.86 m的沉积岩心孢粉记录, 揭示了末次冰期晚期以来的古植被演化和古气候变化历史: 20.9~18.0 cal. ka B.P.期间研究区的植被为典型草原, 气候寒冷干旱; 18.0~15.3 cal. ka B.P.期间研究区的植被为草甸草原, 气候寒冷湿润; 15.3~14.0 cal. ka B.P.期间乔木开始在当地发育, 植被开始由草甸草原向森林草原转变, 气候向较为温暖湿润的方向转变; 14.0~12.8 cal. ka B.P.期间森林草原在温暖湿润的气候影响下, 森林扩张, 草原退缩, 与B?lling-Aller?d暖期相对应; 12.8~11.8 cal. ka B.P.期间草原在寒冷气候下扩张, 可与新仙女木期相对应; 11.8~0.8 cal. ka B.P. 期间在较为温暖的气候条件下, 草原在气候快速变冷事件的影响下发生了多次扩张, 其中, 较为明显的6次气温突降事件分别发生在9.0~8.9, 8.2~7.8, 7.0~6.8, 6.1~5.6, 5.4~5.2, 2.3~1.8 cal. ka B.P..这些快速气候变化事件与全球和区域中其他高分辨率古气候记录具有可比性, 揭示出月亮湖敏感地记录了全球和区域气候的变化, 同时也表明研究区的高分辨率孢粉分析是研究东亚季风强度变化的良好指标.
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| 关 键 词： | 大兴安岭 月亮湖 孢粉记录 末次冰期晚期 古植被 古气候 |
| 收稿时间： | 2011-11-09 |
Pollen-Recorded Vegetation and Climate Changes from Moon Lake since Late Glacial |
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| Abstract: | Moon Lake is one of the volcanic crater lakes at the Aershan-Chaihe volcanic field in the middle part of Daxing'an Mountain Range, located at the current northern margin of the East Asian monsoon. Pollen records of 8.86 m-long sediment core of Moon Lake reveal the vegetation evolution and climate change since the Late Glacial. The result indicates predominantly steppe communities, which are typical of cold and dry climate conditions between 20.9 and 18.0 cal. ka B.P.; the meadow communities which stand for cold and damp climate conditions are present between 18.0 and 15.3 cal. ka B.P.; the beginning of expansion of arbor marks the vegetation change from meadow to forest steppe and the onset of the Late Glacial climatic amelioration towards warm and humid from 15.3 to 14.0 cal. ka B.P.; the woodland expands with the shrink of steppe under the warm and humid climate from 14.0 to 12.8 cal. ka B.P., correlating with the B?lling-Aller?d climate event; the steppe expands later from 12.8 to 11.8 cal. ka B.P. effected by the cold climate, correlating with the Younger Dryas climate events; forest steppe dominates study area under warm climate from 11.8 to 0.8 cal. ka B.P. with six times steppe expansion impacted by cold climate events, which occurred at 9.0-8.9, 8.2-7.8, 7.0-6.8, 6.1-5.6, 5.4-5.2, 2.3-1.8 cal. ka B.P. during the Holocene. These climate events are comparable with other global and regional high-resolution paleoclimate records, revealing the Moon Lake sensitively record the global and regional climate change and high-resolution pollen analysis of study area is a good indicator of East Asian monsoon strength change. |
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