A 12.5‐kyr history of vegetation dynamics and mire development with evidence of Younger Dryas larch presence in the Verkhoyansk Mountains, East Siberia, Russia

A 12.5‐kyr history of vegetation dynamics and mire development with evidence of Younger Dryas larch presence in the Verkhoyansk Mountains, East Siberia, Russia
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12 5 年前的植被动态和泥沼发育历史,以及俄罗斯东西伯利亚 Verkhoyansk 山脉中新仙女木落叶松存在的证据

DOI:
10.1111/j.1502-3885.2009.00116.x
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发表时间:
2009
期刊:
影响因子:
2.2
通讯作者:
Diekmann
Diekmann
中科院分区:
地球科学3区
文献类型:
--
作者:
Werner;Tarasov;Andreev;Müller;Kienast;Diekmann

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Werner, K, Tarasov, P. E, Andreev, A. A, m<s:1> ller, S., Kienast, F., Zech, M., Zech, W.和Diekmann, B. 2009:俄罗斯东西伯利亚Verkhoyansk山脉新森林期落叶松存在的12.5 - kyr植被动态和沼泽发展历史。北风,10.1111 / j.1502 3885.2009.00116.x。ISSN 0300量9483。对Verkhoyansk山脉415厘米厚的永久冻土泥炭剖面进行了放射性碳定年,并使用古植物学和沉积学方法进行了研究。富有机沉积物的积累开始于新仙女木时期的一个牛轭湖,从Dyanushka河的曲流中分离出来,大约在距今12.5 kyr BP。花粉资料表明,当时植被中有大量的落叶松、灌木桤木和矮桦树。在新仙女木时期,当地存在的落叶松被保存完好并经放射性碳测定年代的针和球果所记录。全新世早期的花粉组合显示了高百分比的蒿属花粉,表明该遗址周围存在类似草原的群落,可能是对相对温暖和干燥的气候(11.4-11.2 kyr BP)的响应。花粉和植物大化石资料均表明,落叶松在河谷地区很常见。木炭和花粉的残留表明了火事件,并标志着间隙~ 11.0-8.7 kyr BP。泥炭性质、C31/C27烷烃比值和放射性碳年代的变化表明,另外两次中断发生在~ 8.2-6.9和~ 6.7-0.6 kyr BP。在0.6千年前,一场大火摧毁了泥沼表面。研究剖面上部60 cm为风成砂,上部经现代地层改造。新仙女木时期落叶松的局部生长首次在Verkhoyansk山脉西部前陆(北极圈以南约170公里)得到证实,从而增加了我们对全新世早期欧亚大陆北部快速重新造林的理解。
Werner, K., Tarasov, P. E., Andreev, A. A., Müller, S., Kienast, F., Zech, M., Zech, W. & Diekmann, B. 2009: A 12.5‐kyr history of vegetation dynamics and mire development with evidence of Younger Dryas larch presence in the Verkhoyansk Mountains, East Siberia, Russia.Boreas, 10.1111/j.1502‐3885.2009.00116.x. ISSN 0300‐9483.A 415 cm thick permafrost peat section from the Verkhoyansk Mountains was radiocarbon‐dated and studied using palaeobotanical and sedimentological approaches. Accumulation of organic‐rich sediment commenced in a former oxbow lake, detached from a Dyanushka River meander during the Younger Dryas stadial, at ∼12.5 kyr BP. Pollen data indicate that larch trees, shrub alder and dwarf birch were abundant in the vegetation at that time. Local presence of larch during the Younger Dryas is documented by well‐preserved and radiocarbon‐dated needles and cones. The early Holocene pollen assemblages reveal high percentages ofArtemisiapollen, suggesting the presence of steppe‐like communities around the site, possibly in response to a relatively warm and dry climate ∼11.4–11.2 kyr BP. Both pollen and plant macrofossil data demonstrate that larch woods were common in the river valley. Remains of charcoal and pollen ofEpilobiumindicate fire events and mark a hiatus ∼11.0–8.7 kyr BP. Changes in peat properties, C31/C27 alkane ratios and radiocarbon dates suggest that two other hiatuses occurred ∼8.2–6.9 and ∼6.7–0.6 kyr BP. Prior to 0.6 kyr BP, a major fire destroyed the mire surface. The upper 60 cm of the studied section is composed of aeolian sands modified in the uppermost part by the modern soil formation. For the first time, local growth of larch during the Younger Dryas has been verified in the western foreland of the Verkhoyansk Mountains (∼170 km south of the Arctic Circle), thus increasing our understanding of the quick reforestation of northern Eurasia by the early Holocene.
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