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首页> 外文期刊>The holocene >The Holocene paleoenvironmental history of Western Caucasus (Russia) reconstructed by multi-proxy analysis of the continuous sediment sequence from Lake Khuko
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The Holocene paleoenvironmental history of Western Caucasus (Russia) reconstructed by multi-proxy analysis of the continuous sediment sequence from Lake Khuko

机译：由khuko湖的连续沉积物序列的多功能分析重建西部高加索（俄罗斯）的全新世古环境史

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摘要

This paper presents new multi-proxy records of the Holocene environmental and climatic changes in the Western Caucasus revealed from a continuous sediment sequence from mountainous Lake Khuko (Caucasus State Natural Biospheric Reserve, 1744 m a.s.l.). Palaeoecological analyses of a sediment core for grain size, magnetic susceptibility, loss on ignition, and pollen allowed us to determine five principal climatic phases with several subphases since 10.5 ka BP. The age model is based on seven accelerator mass spectrometry~(14)C dates, supplemented by~(210)Pb data for the uppermost part of the sediment core. Warm periods (10.5–6.7, 6.7–5.5, 3.5–2.4, 0.8–0.5 ka BP) were characterized by high biological productivity in the lake as indicated by high organic matter content and expansion of forests, typical of modern low and middle mountain zones, as indicated by the increase in abundance of Quercus, Ulmus, Corylus , and Tilia in the pollen assemblages. Cold periods (5.5–3.5, 2.4–0.8, and 0.5 ka BP–present) are marked by a consistent decrease in organic matter content in lake deposits and possibly higher intensity of the catchment erosion. The changes in pollen assemblages (for instance peaks of Abies, Picea , and Pinus ) suggested a potential elevational decline in the boundaries of vegetation belts and expansion of high-altitude woodlands. Abrupt changes in the lake ecosystem were identified between 4.2 and 3.5 ka cal BP marked by a short-term variation in sediment regime shown by variation in organic matter content, magnetic susceptibility values, and sediment grain size. This was probably caused by climatic fluctuations in the Western Caucasus region as a result of complex shifts in the ocean-atmosphere system during the 4.2 ka event. Overall, the first Holocene multi-proxy continuous lake sediment record provides new insights into the climate history in the Western Caucasus.
机译：本文介绍了西部高加索的全新世环境和气候变化的新型多功能记录，从山地湖Khuko（高加索国家天然生物储备，1744米A.S.L.）中透露了西部高加索的全年沉积物序列。古代生态分析粒度沉积物核心，磁敏感，点火丧失，花粉使我们允许我们确定自10.5kA BP以来几种子双子均的五个主要气候阶段。年龄模型基于七个加速器质谱〜（14）C日期，补充沉积物核心最上部的〜（210）Pb数据。温暖的时期（10.5-6.7,6.7-5.5,3.5-2.4，0.8-0.5 kA BP）在湖中的高生物生产率，如高有机物质含量和森林的扩张，典型的现代低和中山地区所表明，如花粉组合中丰富的栎（Ulmus，Corylus和Tilia）的增加所表明的。冷时期（5.5-3.5,2.4-0.8和0.5ka BP-present）标志着湖泊沉积物中有机物质含量的一致减少，并且可能更高的集水侵蚀强度。花粉组合的变化（例如，Abies，Picea和Pinus的峰）建议植被带的界限和高空林地扩张的潜在高度下降。在4.2和3.5kA的突出变化之间鉴定在4.2和3.5ka CAL BP之间，由有机物质含量，磁敏感值和沉积物粒度的变化所示的沉积物制度的短期变化标记。这可能是由于在4.2 ka活动期间海洋气氛系统的复杂变化，这可能是由于西高加索地区的气候波动引起的。总体而言，第一个全新世多功能湖沉积物记录为西部高加索的气候历史提供了新的洞察力。

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