A 20,000-year high-resolution pollen record from Huguangyan Maar Lake in tropical-subtropical South China
A 20,000-year high-resolution pollen record from Huguangyan Maar Lake in tropical-subtropical South China
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华南热带亚热带湖光岩玛珥湖2万年高分辨率花粉记录
DOI：
10.1016/j.palaeo.2017.01.038
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发表时间：
2017-04-15
影响因子：
3
通讯作者：
Yang, Zhenyu
中科院分区：
文献类型：
--
作者：
Sheng, Mei;Wang, Xisheng;Yang, Zhenyu
本文报道了中国南海湖光岩玛珥湖近20, 400 yr BP以来的高分辨率花粉记录，旨在进一步了解末次盛冰期晚期以来华南热带-亚热带地区植被对气候变化的响应。结果表明，亚洲夏季风（ASM）强度通过轨道引起的北方半球夏季太阳辐射的变化对植被的强烈控制。本区气候演变趋势为暖温带-北亚热带气候（20，400 - 18，700 cal yr BP）到南亚热带气候（16，500 - 11，500卡/年BP），随后环境从热带气候逐步转变（11，500 -8200 cal yr BP），到南亚热带气候（8200-6600 cal yr BP），最后到中北部亚热带气候。在整个记录中，博林-阿勒罗德变暖的特征是万年青栎属的百分比最高，但旱生禾本科的百分比最低，这表明在15000 - 13000卡年BP期间，温暖，潮湿的条件得到加强。相比之下，新仙女木期的特征是亚热带万年青阔叶植物显著减少，但草本植物类群显著增加，代表了13，000 - 12，000 cal yr BP期间的短暂冷逆转。在8.2和6.6 kyr BP，这两个主要的冷却事件的发生，其特点是热带万年青阔叶植物的急剧减少，被认为是与一个明显的减弱的ASM和南迁移的热带辐合带与大西洋经向翻转环流显着下降。随后的短暂间隔的高草本花粉的百分比，但热带类群的百分比低，对应于高厄尔尼诺/南方涛动（ENSO）活动，支持太阳能隔离驱动的ASM强度减弱和ENSO逐渐加剧之间的联系。(C)2017爱思唯尔B. V.保留所有权利。
A high-resolution pollen record from Huguangyan Maar Lake near the South China Sea spanning the past 20,400 yr BP has been presented, aimed to provide an improved understanding of the response of the regional vegetation in tropical-subtropical South China to climatic variations since the late Last Glacial Maximum. The results reveal the strong control of the Asian summer monsoon (ASM) strength on vegetation via orbitally-induced variations in Northern Hemisphere summer solar insolation. The trend of climatic evolution of the region consists of change from a warm temperate-northern subtropical climate (20,400-18,700 cal yr BP) to a southern subtropical climate (16,500-11,500 cal yr BP) during the last deglaciation, followed by a stepwise environmental shift from a tropical climate (11,500-8200 cal yr BP), to a southern subtropical climate (8200-6600 cal yr BP) and finally to a middle-northern subtropical climate. The Bolling-Allerod warming is characterized by the highest percentages of evergreen Quercus but the lowest percentages of xerophytic Gramineae throughout the record, suggesting intensified warm, wet conditions during 15,000-13,000 cal yr BP. By contrast, the Younger Dryas is characterized by a marked decrease in subtropical evergreen broad-leaved plants but a significant increase in herbaceous taxa, representing a brief cold reversal during 13,000-12,000 cal yr BP. The occurrence of two major cooling events at 8.2 and 6.6 kyr BP, both of which are characterized by dramatic decreases in tropical evergreen broad-leaved plants, is supposed to be linked to a distinct weakening of the ASM and southward migration of the Intertropical Convergence Zone associated with marked declines in Atlantic Meridional Overturning Circulation. The subsequent brief intervals of high herbaceous pollen percentages but low percentages of tropical taxa correspond to high El Nitio/Southem Oscillation (ENSO) activity, supporting a link between the weakening of solar isolation-driven ASM strength and a gradual intensification of ENSO. (C) 2017 Elsevier B.V. All rights reserved.