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Millennial-scale vegetation history of the north-eastern Russian Arctic during the mid-Pliocene inferred from the Lake El'gygytgyn pollen record
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.gloplacha.2019.103111
Andrei A. Andreev , Pavel E. Tarasov , Volker Wennrich , Martin Melles

Abstract The 318-m long sediment record from Lake El'gygytgyn, NE Russia situated in the present-day herb tundra zone, provides a unique archive of high Arctic environmental changes since ca 3.6 million years ago (Ma). This paper focuses on pollen-derived vegetation change during the mid-Pliocene Warm Period (mPWP) and in particular during Marine Isotope Stage (MIS) M2, which is known to represent the coldest interval of the Pliocene. Building on initial pollen studies, we provide a more complete record and a more detailed discussion of climatically-driven vegetation and environmental changes in the northeastern Russian Arctic, spanning the 203-thousand-year interval between 3.383 and 3.180 Ma ago. Pine-spruce-fir-larch-Douglas fir forests dominated the area around Lake El'gygytgyn between 3.383 and 3.330 Ma (MIS MG4 - MIS MG2). Colder and drier climate caused a decrease of coniferous forests and widespread Sphagnum habitats around the lake between 3.370 and 3.357 Ma. After 3.3 Ma, the presence of spruce, fir and Douglas fir decreased again. A very pronounced cooling took place at the first half of MIS M2 (3.312–3.283 Ma), when treeless tundra- and steppe-like habitats became common in the regional vegetation. Climate conditions were similar or only slightly warmer and wetter to those of the Holocene. Numerous coprophilous fungi spores identified in the MIS M2 pollen samples suggest the presence of grazing mammals around the lake. Larch-pine forests with some spruce started to dominate the area again after ca. 3.282 Ma, thus pointing to a significant climate amelioration during the mPWP. However, the forested area decreased, while herb- and shrub-dominated vegetation spread again during MIS KM6 (especially 3.235–3.223 Ma), suggesting a noticeable climatic deterioration and relatively cold and dry conditions.

中文翻译:

从 El'gygytgyn 湖花粉记录推断的上新世中期俄罗斯东北部北极地区的千年尺度植被历史

摘要 位于现今草本苔原带的俄罗斯东北部 El'gygytgyn 湖 318 米长的沉积物记录提供了自大约 360 万年前(Ma)以来北极环境剧烈变化的独特档案。本文重点研究了上新世中期暖期 (mPWP) 期间花粉衍生的植被变化,特别是海洋同位素阶段 (MIS) M2 期间,该阶段已知代表上新世最冷的时期。在最初的花粉研究的基础上,我们提供了更完整的记录,并更详细地讨论了俄罗斯北极东北部气候驱动的植被和环境变化,跨越了 3.383 到 3.180 Ma 之前的 20.3 万年间隔。松-云杉-冷杉-落叶松-花旗松森林在 3.383 至 3.330 Ma (MIS MG4 - MIS MG2) 之间占据了 El'gygytgyn 湖周围的区域。在 3.370 到 3.357 Ma 之间,更冷和更干燥的气候导致湖周围的针叶林和广泛的泥炭藓栖息地减少。3.3 Ma后,云杉、冷杉和花旗松的存在再次减少。MIS M2 的前半部分(3.312-3.283 Ma)发生了非常明显的降温,此时区域植被中无树木的苔原和草原状栖息地变得普遍。气候条件与全新世的气候条件相似或仅略微温暖和湿润。在 MIS M2 花粉样本中发现的大量嗜粪真菌孢子表明湖周围存在食草哺乳动物。大约在 2000 年之后,带有一些云杉的落叶松林再次占据了该地区的主导地位。3.282 Ma,因此表明 mPWP 期间气候显着改善。然而,森林面积减少了,
更新日期:2020-03-01
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