Postglacial vegetation and climate change in the Lake Onega region of eastern Fennoscandia derived from a radiocarbon-dated pollen record

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Aleksandra I. Krikunova , Larisa A. Savelieva , Tengwen Long , Christian Leipe , Franziska Kobe , Natalia A. Kostromina , Aleksandra V. Vasilyeva , Pavel E. Tarasov
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引用次数: 0

Abstract

With its numerous environmental archives stored in lake and peat sediments and relatively low human pressure, the Lake Onega region in eastern Fennoscandia is regarded as a particularly promising area for studying past changes in vegetation and climate since the Lateglacial period. The 885-cm-long sediment core RZ19 (62°27′53″N, 34°26′4″E) was collected from Razlomnoe Peat on the northern shore of Lake Onega in 2019, radiocarbon-dated and analysed for pollen and cryptogam spores. The age-depth model suggests continuous sedimentation since ca. 11,800 a BP (all ages given in years (a) or kiloyears (ka) before present (BP) with BP referring to 1950 CE). The results of pollen analysis and pollen-based biome reconstruction show rapid afforestation of the area in the Early Holocene, although the scores of the tundra biome remain relatively high prior to ca. 11,450 a BP, suggesting that the vegetation was likely more open than today. Between 8300 and 8000 a BP, Betula sect. Albae shows a marked increase in pollen percentage, while Pinus sylvestris experiences a marked decrease. These changes coinciding with the 8.2 ka BP cooling event indicate less favourable conditions for Scots pine while being beneficial for fast-growing birch. The transition from the Early to Middle Holocene (i.e. from Greenlandian to Northgrippian) is marked by an increase in pollen productivity, spread of Picea and further afforestation of the area. The decrease in arboreal and Picea pollen percentages and the abrupt increase in landscape openness after ca. 4000 a BP mark the onset of the Late Holocene (i.e. Northgrippian-Meghalayan transition) and likely reflect the combined effect of insolation-induced temperature decrease and associated paludification and forest retreat rather than a decrease in atmospheric precipitation and/or spread of Late Neolithic agriculture.

根据放射性碳-年代测定的花粉记录得出的东芬诺斯康迪亚奥涅加湖地区冰川期后的植被和气候变化
由于湖泊和泥炭沉积物中储存了大量环境档案,而且人类压力相对较小,位于芬诺斯坎迪亚东部的奥涅加湖地区被认为是研究拉特冰期以来植被和气候过去变化的一个特别有前途的地区。885 厘米长的沉积物岩芯 RZ19(北纬 62°27′53″,东经 34°26′4″)于 2019 年从奥涅加湖北岸的 Razlomnoe 泥炭中采集,经放射性碳年代测定,并对花粉和隐花植物孢子进行了分析。年龄深度模型表明,自约公元前 11800 年以来,沉积作用一直在持续。所有年龄均以距今(BP)年(a)或千年(ka)为单位,BP 指公元 1950 年)。花粉分析和基于花粉的生物群落重建结果表明,该地区在全新世早期迅速植树造林,但在约公元前 11450 年之前,苔原生物群落的得分仍然相对较高,这表明当时的植被可能比现在更加开阔。在公元前 8300 至 8000 年之间,桦树科(Betula sect.白桦属植物的花粉比例明显增加,而欧洲赤松属植物的花粉比例则明显减少。这些变化与 8.2 ka BP 的降温事件相吻合,表明苏格兰松树的生长条件较差,而对快速生长的桦树有利。从全新世早期到全新世中期(即从格陵兰期到北格里皮期)的过渡,标志着花粉生产力的提高、Picea 的扩散以及该地区植树造林的进一步发展。大约公元前 4000 年之后,树栖和杉木花粉比例下降,地貌开阔度突然增加,这标志着该地区进入了全新世。这可能反映了日照引起的气温下降以及与之相关的棕榈化和森林退缩的综合影响,而不是大气降水量的减少和/或新石器时代晚期农业的传播。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Quaternary International
Quaternary International 地学-地球科学综合
CiteScore
5.60
自引率
4.50%
发文量
336
审稿时长
3 months
期刊介绍: Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience. This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.
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