A new accerator mass spectrometry (AMS)-dated sedimentary record from Lake Ochaul (54°14′N, 106°28′E; 641 m a.s.l.) in Eastern Siberia covers the interval from ca. 27 850 to 20 400 cal a bp at ca. 180-year resolution and contributes to a better understanding of the complex spatial vegetation pattern during the Last Glacial Maximum (LGM). Non-arboreal pollen taxa are abundant in the pollen assemblages (mean value ca. 92.6%), but boreal trees are represented by all major taxa that grow in the lake catchment today, including Betula sect. Albae (0.6–4.8%), Picea (0.6–2.8%), Pinus sibirica (Haploxylon type) (up to 1.5%), Pinus sylvestris (Diploxylon type) (up to 2%), Larix (up to 0.6%) and Abies (up to 0.6%). Betula sect. Nanae/Fruticosae (2–5.2%) and Salix (up to 3.2%) are the most representative boreal shrub taxa. Together with existing modern and fossil pollen data from the wider study region, the current record provides further evidence for the long-debated presence of boreal trees and shrubs in Eastern Siberia throughout the LGM. Our results show that the Upper Lena was a region in which refugia for arboreal taxa existed and that far-distant pollen transport can be ruled out as the source of the detected arboreal pollen.

中文翻译：

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不仅仅是草本植物和杂草：基于花粉的证据表明在西贝加尔湖（东西伯利亚）存在来自奥乔尔湖末次盛冰期沉积物的北方树木和灌木

来自东西伯利亚的奥乔尔湖（54°14′N，106°28′E；641 m asl）的新加速器质谱（AMS）沉积记录涵盖了从大约 27 850 至 20 400 cal a bp at ca。180 年的分辨率，有助于更好地了解末次盛冰期 (LGM) 期间复杂的空间植被格局。花粉组合中有丰富的非树栖花粉类群（平均值约 92.6%），但北方树木代表着今天在湖流域生长的所有主要类群，包括白桦属。白杨 ( 0.6–4.8 %)、云杉(0.6–2.8%)、西伯利亚松（单木属型）（最高 1.5%）、樟子松（双木属）类型）（最高 2%）、落叶松（最高 0.6%）和冷杉（最高 0.6%）。白桦宗。Nanae/Fruticosae (2–5.2%) 和Salix (高达 3.2%) 是最具代表性的北方灌木类群。连同来自更广泛研究区域的现有现代和化石花粉数据，目前的记录为整个 LGM 的东西伯利亚存在长期争论的北方树木和灌木提供了进一步的证据。我们的研究结果表明，上勒拿是一个存在树栖类群避难所的地区，可以排除远距离花粉运输作为检测到的树栖花粉的来源。