Late Pleistocene and Holocene vegetation and climate records from Lake Kotokel, central Baikal region
Late Pleistocene and Holocene vegetation and climate records from Lake Kotokel, central Baikal region
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DOI：
10.1016/j.quaint.2009.02.005
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发表时间：
2009-08
影响因子：
2.2
通讯作者：
K. Shichi;H. Takahara;S. Krivonogov;E. Bezrukova;K. Kashiwaya;A. Takehara;Toshio Nakamura
中科院分区：
文献类型：
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作者：
K. Shichi;H. Takahara;S. Krivonogov;E. Bezrukova;K. Kashiwaya;A. Takehara;Toshio Nakamura
基于贝加尔湖东岸Kotokel湖和Cheremushka沼泽沉积物的花粉记录，重建了气候驱动的晚更新世和全新世植被变化。所描述的古环境记录比从贝加尔湖收集的记录具有更高的分辨率，并将以前在底部和岸上岩心研究中确定的单个事件联系起来。景观的显著变化和指数植物的扩展如下。森林苔原和/或森林草原景观，以桦树、云杉、蒿科和禾本科为主。末次盛冰期以蒿科和禾本科植物为主的冻土带和（或）草原植被为典型。灌木桦树和柳树的扩张发生在15.514C kyrBP左右。在约47.5 ~ 442.14 c kyrBP （Karginian time）和约14.5 ~ 13ka （b ølling- allero ød warm intervals）的两个云杉扩张峰表明当时的条件比现在更为湿润。在约11-10.514C kyrBP （13-12ka）期间，蒿属植物略有增加，表明新仙女木事件的发生。大约12-6.4ka的桦树林和冷杉林的扩张表明湿度较高。目前占主导地位的苏格兰松林和西伯利亚松林自6.4ka以来一直在扩大。
Climatically driven Late Pleistocene and Holocene vegetation changes were reconstructed based on pollen records from the sediments of Lake Kotokel and Cheremushka Bog, located on the eastern shore of Lake Baikal. The described paleoenvironmental record has higher resolution than records collected from Lake Baikal and unites individual events identified in prior studies of bottom and onshore cores. Remarkable shifts in landscapes and expansions of index plants are as follows. Forest tundra and/or forest steppe landscape with birch, spruce, Artemisia, and Poaceae prevailed at ca. 50–2514C kyrBP. Tundra and/or steppe vegetation dominated by Artemisia and Poaceae was typical for the Last Glacial Maximum. The expansion of shrub birch and willow occurred at ca. 15.514C kyrBP. Two peaks of spruce expansion at ca. 47.5–42.414C kyrBP (Karginian time) and at ca. 14.5–13ka (Bølling-Allerød warm intervals) suggest that the condition were more humid than today. A slight increase in Artemisia at ca. 11–10.514C kyrBP (13–12ka) was indicative of the Younger Dryas event. An expansion of birch forests with fir at ca. 12–6.4ka suggests higher humidity. The currently dominant Scots and Siberian pine forests with birch expanded since 6.4ka.