| 黔西高原末次冰期晚期古植被及西南季风演变* |
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| 引用本文： | 赵增友,石胜强,袁智郴,殷建军,陈志霞,秦趣.黔西高原末次冰期晚期古植被及西南季风演变*[J].古地理学报,2019,21(6):1013-1024. |
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| 作者姓名： | 赵增友 石胜强 袁智郴 殷建军 陈志霞 秦趣 |
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| 作者单位： | 1.六盘水师范学院旅游与历史文化学院,贵州六盘水 553004;2.西南大学地理科学学院,重庆 400715;3.中国地质科学院岩溶地质研究所,广西桂林 541004 |
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| 基金项目： | Co-funded by the Natural Science Foundation of the Guizhou Provincial Education Department(No. Qian Education Corporation KY Character[2014]284),Joint Foundation of Guizhou Provincial Science and Technology Department(No. Qian Technology Corporation LH Character[2014]7458),The Major Research Project of the Innovation Group of the Guizhou Provincial Education Department(No. Qian Education Corporation KY Character[2016]056] and the Project Science and Technology in Liupanshui(No. 52020-2018-03-08) |
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| 摘 要： | 黔西高原的长时间序列孢粉记录比较少,限制了对该地区末次冰期晚期古植被及西南季风演化过程和机制的认识。本研究通过对黔西高原一个连续的古湖泊沉积物孢粉记录的分析,并结合AMS14C测年,重建黔西高原末次冰期晚期古植被及西南季风演化。结果表明: 轨道尺度上,MIS3(氧同位素3阶段)中晚期,黔西高原主要为木本、草本植物,喜湿的针叶树种较多,西南季风较强。MIS2(氧同位素2阶段)期间,喜湿的针叶树种减少,而草本、蕨类植物增多,指示气候冷干,西南季风减弱。千年尺度上,黔西高原西南季风响应于北大西洋冰漂碎屑事件及H3(Heninrich 3)、H2(Heninrich 2)和LGM(Last Glacial Maximum)事件,导致西南季风减弱,喜湿的针叶树种减少。通过对比发现,东亚夏季风和西南季风在轨道及千年尺度上协同演化,二者均响应于北半球高纬度太阳辐射变化及北大西洋冰漂碎屑事件。在19~18 cal ka BP,黔西高原经历最冷干气候,西南季风减弱,木本、草本植物近乎消失,而同期东亚夏季风增强,说明西南季风和东亚夏季风在冰后期上存在反相位关系。
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| 关 键 词： | 黔西高原 孢粉 古植被 MIS3/2 西南季风 |
| 收稿时间： | 23 April 2019 |
Evolution of vegetation and Southwest Monsoon during the late Last Glacial Period in western Guizhou plateau |
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| Zhao Zeng-You,Shi Sheng-Qiang,Yuan Zhi-Chen,Yin Jian-Jun,Chen Zhi-Xia,Qin Qu.Evolution of vegetation and Southwest Monsoon during the late Last Glacial Period in western Guizhou plateau[J].Journal of Palaeogeography,2019,21(6):1013-1024. |
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| Authors: | Zhao Zeng-You Shi Sheng-Qiang Yuan Zhi-Chen Yin Jian-Jun Chen Zhi-Xia Qin Qu |
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| Institution: | 1.Tourism and History Culture Department,Liupanshui Normal University,Guizhou Liupanshui 553004,China;2.School of Geography Science,Southwest University,Chongqing 400715,China;3.Institute of Karst Geology,Chinese Academy of Geological Sciences,Guangxi Guilin 541004,China |
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| Abstract: | Western Guizhou plateau is an ideal place to reconstruct variations of the Southwest Monsoon since the Last Glacial Period. However,lack of continuous and high temporal resolution records obstacle understanding of evolution of the paleo-vegetation and the Southwest Monsoon. Here we present a palynology record since the Last Glacial Period,which was obtained from a drained paleo-lake in the western Guizhou plateau,with precise AMS14C date, to reconstruct the evolutionary history of vegetation and monsoon. Result shows that: On orbital scale during the stage of MIS3,the main vegetation comprised of arboreal and herbs,in which coniferous arboreal pollen percentage reach its maximum,and indicated a warm and humid climate,implying a strong Southwest Asia Monsoon. During MIS2,the arboreal forest decreased dramatically and the herbs and ferns extended,indicating that a cold and dry climate occurred in this area,implying a weaker Southwest Asia Monsoon,especially during the LGM. On millennium scale,Southwest Asia Monsoon of the western Guizhou plateau co-responded to the “ice drift events”in the North Atlantic,and the Heinrich(mainly H3 and H2)and LGM events resulted in weaker Southwest Asia Monsoon and the decrease of coniferous vegetation in western Guizhou plateau. Comparing with regional climate records reveal that the Southwest Monsoon and the East Asia Summer Monsoon changed synchronous on orbital or millennial scale. The in-phrase relationship implies variations of monsoon system attributed to insolation dynamics in north high latitude and the North Atlantic “ice sheets raft”. Between 19-18 cal ka BP,the research area underwent the driest and coldest climate since MIS2,the arboreal and herbal vegetation nearly disappeared,and the dominant vegetation were ferns,indicating the weakest Southwest Monsoon,while the East Asia Summer Monsoon began to strengthen,which testifies the out-phrase relationship of the two monsoon systems on sub-millennial scale. |
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| Keywords: | western Guizhou plateau pollen paleovegetation MIS3/2 Southwest Monsoon |
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