Late Pleistocene spread of (cool-)temperate forests in Northeast China and climate changes synchronous with the North Atlantic region
Late Pleistocene spread of (cool-)temperate forests in Northeast China and climate changes synchronous with the North Atlantic region
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DOI：
10.1016/j.gloplacha.2008.10.010
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发表时间：
2009
影响因子：
3.9
通讯作者：
M. Stebich;J. Mingram;Jingtai Han;Jia-qi Liu
中科院分区：
文献类型：
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作者：
M. Stebich;J. Mingram;Jingtai Han;Jia-qi Liu
四海龙湾湖年度叠层沉积序列的研究结果首次提供了晚冰期至全新世早期(16700-10600年间)的全面古生态记录。BP)，来自东北的中国。高分辨率的花粉分析使我们能够比以前更详细地重建最后一次冰川-间冰期过渡期间的植被和气候变化。此外，Vave计数和40个定标的AMS14C年龄测定都提供了可靠的年代学。古植物学证据表明，主要是草原和开阔的类似泰加的林地群落，盛产白桦、落叶松、赤杨、蒿属、草和莎草，这是16700至14450年间寒冷和干燥条件下的典型特征。BP。榆树和白蜡树的开始扩张标志着14450年来冰川晚期气候改善的开始。BP。茂密的落叶林，主要由嗜热的阔叶类群组成，在全新世早期形成并广泛分布。在13,900至13,800卡年间的替代数据中记录了两次向较冷和/或干燥条件的短期气候逆转。BP和13,100和12,900卡年。BP，分别与最古老的仙女木/格陵兰间(GI)1D事件和Gerzensee/Killarney/Gi-1b振荡相关。在全新世开始之前，云杉和落叶松的显著再现，加上阔叶树的显著减少，意味着与环大西洋地区的年轻仙女木事件相适应的气候逆转。北大西洋地区和东亚地区气候变化的明显同步性支持了这两个地区之间的强大气耦合理论。
The results presented here from the annually laminated sedimentary sequence of Sihailongwan lake provide the first comprehensive palaeoecological record covering the Late Pleniglacial to the Early Holocene (16,700–10,600 cal yrs. BP) from Northeast China. High-resolution pollen analyses have enabled the vegetational and climatic changes of the last glacial-interglacial transition to be reconstructed in more detail than has been previously possible. Moreover, a reliable chronology has been provided by both varve counting and 40 calibrated AMS14C age determinations. Palaeobotanical evidence indicates predominantly steppe and open taiga-like woodland communities, with abundant Betula, Larix, Alnus fruticosa, Artemisia, grasses and sedges, which are typical of cold and dry conditions between 16,700 and 14,450 cal yrs. BP. The beginning expansion of Ulmus and Fraxinus marks the onset of the Late-glacial climatic amelioration at 14,450 cal yrs. BP. Dense deciduous forests, predominantly consisting of thermophilous broadleaf taxa, become established and widespread during the Early Holocene. Two short-term climatic reversals to colder and/or dryer conditions are recorded in the proxy data between 13,900 and 13,800 cal yrs. BP and 13,100 and 12,900 cal yrs. BP, correlating with the Oldest Dryas/Greenland Interstadial (GI) 1d event and the Gerzensee/Killarney/GI-1b oscillation, respectively. The prominent reappearance of Picea and Larix, coupled with a marked decrease in broadleaved trees, prior to the start of the Holocene, implies a climatic reversal compatible with the Younger Dryas event in the circum-Atlantic region. The evident synchroneity of climate changes in the North Atlantic region and East Asia supports the theory of strong atmospheric coupling between both regions.