Sedimentary evidence of landscape and climate history since the end of MIS 3 in the Krkonose Mountains, Czech Republic
Sedimentary evidence of landscape and climate history since the end of MIS 3 in the Krkonose Mountains, Czech Republic
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DOI：
10.1016/j.quascirev.2009.12.008
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发表时间：
2010-04-01
影响因子：
4
通讯作者：
Lisa, Lenka
中科院分区：
文献类型：
--
作者：
Engel, Zbynek;Nyvlt, Daniel;Lisa, Lenka
从Labsky dul山谷（海拔1039米）的冰斗盆地中发现的沉积岩芯。反映了近3万年来的环境历史。在一个15米厚的沉积物序列的磁化率，碳含量，花粉组合和宏体化石数据的分析提供了第一个连续记录的晚冰期和全新世植被历史在捷克共和国的苏台德地区。在核心的下部的沉积单元的继承表明，冰斗是在海洋同位素阶段2开始的最后一次冰川作用的开始之前，无冰。在此期间，气候高度多变，寒冷的条件下达到顶峰约18 cal ka BP。寒冷的气候一直持续到晚冰期，证据是与新仙女木时期相关的变暖和随后的冷却事件。稀疏，无树植被占主导地位的集水区在当时的顺序中断薄层粉砂反映了当地的冰川在冰斗在12 5-10 8卡BP的撤退和暂时的再进随后，高山树线交错带逐渐转移以上的冰斗地板。早全新世的古气候条件波动强烈，而自5 - 1 cal ka BP条件一直比较稳定。基于花粉的气候重建表明，大约在9 8-9 3，从50 cal ka BP以来，云杉林占主导地位，当时植被与现代植被相似。在全新世期间，确定了两个增加沉积的阶段，分别在9.2-7.5 cal ka BP和5.8 - 3.3 cal ka BP。在此期间，沉积物产量高达24毫米/年（-1），反映了大西洋/亚北方过渡期间的环境变化（C）2009 Elsevier Ltd.版权所有
A sedimentary core recovered from the cirque basin of Labsky dul valley (1039 m a.s.l.) in the Krkonose Mountains reflects the environmental history for approximately the last 30,000 years. Analyses of magnetic susceptibility, carbon content, pollen assemblages and macrofossil data in a 15 m thick sediment sequence provide the first continuous record of Lateglacial and Holocene vegetation history in Sudetes region of the Czech Republic. The succession of sedimentary units in the lower part of the core suggests that the cirque was ice-free before the onset of the last glaciation at the beginning of marine isotope stage 2. Highly variable climate prevailed during this period with cold conditions culminating about 18 cal ka BP. Cold climates persisted until the Lateglacial period, evidenced by an identified warming and subsequent cooling event correlated with the Younger Dryas period. Sparse, treeless vegetation dominated in the catchment area at that time The sequence of interrupted thinly laminated silts reflects the retreat and temporary readvance of a local glacier in the cirque during 12 5-10 8 cal ka BP Subsequently, the alpine treeline ecotone gradually shifted above the cirque floor. Palaeoclimatic conditions in the early Holocene fluctuated strongly, whereas since 5 1 cal ka BP conditions have been more stable. Pollen-based climate reconstructions suggest significant cooling at around 9 8-9 3, 7.7-7.5 and 4 0-3 3 cal ka BP Spruce forests have dominated the site since 50 cal ka BP when the vegetation became similar to the modern one Two phases of increased sedimentation were identified within the Holocene culminating about 9.2-7.5 cal ka BP and 5 8-5.5 cal ka BR Sediment yield was as high as 24 mm yr(-1) during the period, reflecting environmental changes during the Atlantic/Sub-Boreal transition (C) 2009 Elsevier Ltd. All rights reserved