Multi-proxy climate and environmental records from a Holocene eutrophic mire, southern taiga subzone, West Siberia

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Boreas Pub Date : 2022-10-04 DOI:10.1111/bor.12604
Irina V. Kurina, Elena E. Veretennikova, Anna A. Il’ina, Marina L. Egorova, Lyudmila V. Salisch, Vladimir N. Dolgin, Albert V. Udaloi, Evgeniya A. Golovatskaya, Egor A. Dyukarev, Sergei V. Smirnov
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Abstract

Palaeoenvironmental reconstructions from peat are strongly focused on ombrotrophic mires, but this study demonstrates that eutrophic mires can also be used. A multi-proxy approach was applied to a eutrophic mire on a floodplain terrace in the southern taiga of West Siberia. The results of the reconstruction were considered in the wide geographic context of the surrounding regions, including Siberia and Central Asia. Different palaeoecological proxies (analysis of plant macrofossils, testate amoebae, oribatid mites, molluscs, peat humification, ash content and spectral characteristics of humic acids) were used in this study. The results of different proxies showed a high level of consistency among themselves, which allowed for a robust interpretation of Holocene mire development. Throughout the ~7800 years history of the mire, there was a high level of surface wetness. The presence of mineral matter in the peat between 7800 and 5100 cal. a BP indicates regular flooding caused by the intensive fluvial activity, apparently resulting from increased precipitation. This was followed by a trend towards a gradual decrease in surface wetness from conditions of high surface moisture (stagnant water) between 5100 and 3000 cal. a BP to present day conditions of moderate surface moisture with a water table slightly below the mire surface. This pattern is consistent with the well-documented long-term trend from palaeoecological records throughout the taiga and arctic zones in West Siberia and central arid Asia. Our data further support the idea that the westerlies were the dominant driver of climate for the southern taiga of West Siberia during the Middle to Late Holocene.

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西西伯利亚泰加亚带南部全新世富营养化沼泽的多代理气候和环境记录
泥炭的古环境重建主要集中在富营养化的沼泽上,但这项研究表明,富营养化沼泽也可以使用。将多代理方法应用于西西伯利亚南部针叶林泛滥平原阶地上的富营养化淤泥。重建的结果是在包括西伯利亚和中亚在内的周边地区的广泛地理背景下考虑的。本研究采用了不同的古生态指标(植物大化石、种皮变形虫、甲螨、软体动物、泥炭腐殖化、灰分和腐殖酸光谱特征的分析)。不同指标的结果显示出它们之间的高度一致性,这使得能够对全新世沼泽发育进行有力的解释。整个约7800年 多年的泥沼历史,曾有过较高的地表湿度。7800年至5100年间泥炭中矿物质的存在 cal.a BP表示由强烈的河流活动引起的定期洪水,显然是由降水增加引起的。随后,表面湿度从5100至3000之间的高表面湿度(死水)条件逐渐降低 cal.a BP到目前的中等表面湿度条件,地下水位略低于泥沼表面。这种模式与西西伯利亚和亚洲中部干旱地区针叶林和北极地区古生态记录中的长期趋势一致。我们的数据进一步支持了这样一种观点,即在全新世中期至晚期,西风带是西西伯利亚南部针叶林气候的主要驱动力。
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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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Issue Information Boreas Reviewers, volume 53 Late Middle Pleistocene (MIS 11-6) in Europe – introduction Late Middle Pleistocene Wolstonian Stage (MIS 6) glaciation in lowland Britain and its North Sea regional equivalents – a review Issue Information
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