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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Impacts of paleohydrological changes on n-alkane biomarker compositions of a Holocene peat sequence in the eastern European Russian Arctic
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Impacts of paleohydrological changes on n-alkane biomarker compositions of a Holocene peat sequence in the eastern European Russian Arctic

机译：古水文学变化对东欧俄罗斯北极全新世泥炭序列正构烷烃生物标志物组成的影响

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摘要

Coupled analyses of n-alkane biomarkers and plant macrofossils from a peat plateau deposit in the northeast European Russian Arctic were carried out to assess the effects of past hydrology on the molecular contributions of plants to the peat. The n-alkane biomarkers accumulated over 9.6kyr of local paleohydrological changes in this complex peat profile in which a succession of vegetation changes occurred during a transition from a wet fen to a relatively dry peat plateau bog. This study shows that the contribution of the n-C_(31) alkane from rootlets to peat layers rich in fine and dark roots is important. The results further indicate that the n-alkane P_(aq) and n-C_(23)-C_(29) biomarker proxies that have been useful to reconstruct past water table levels in many peat deposits can be misleading when the contributions of Betula and Sphagnum fuscum to the peat are large. Under these conditions, the C_(23)/(C_(27)+C_(31)) n-alkane ratio seems to correct for the presence of Betula and S. fuscum and provides a better description for the relative amounts of moisture. The average chain length (ACL) n-alkane proxy also appears to be a good paleohydrology proxy in having larger values during dry and cold conditions in this Arctic bog setting.
机译：进行了俄罗斯东北北极泥炭高原沉积物中正构烷烃生物标志物和植物大化石的耦合分析，以评估过去水文学对植物对泥炭分子贡献的影响。在这种复杂的泥炭剖面中，正构烷烃生物标志物累积了超过9.6kyr的局部古水文变化，在从湿fen到相对干燥的泥炭高原沼泽的过渡过程中，一系列植被变化发生。这项研究表明，n-C_（31）烷烃从小根到富含细根和深色根的泥炭层的贡献很重要。结果进一步表明，当许多泥炭沉积物的贡献对重建过去的泥炭水位有所帮助时，正构烷烃P_（aq）和n-C_（23）/ n-C_（29）生物标志物代理可能会误导人们。桦木和泥炭藓到泥炭很大。在这些条件下，C_（23）/（C_（27）+ C_（31））正构烷烃比似乎可以纠正桦木和镰刀菌的存在，并提供了相对湿度的更好描述。平均链长（ACL）正构烷烃替代物似乎也是良好的古水文学替代物，在此北极沼泽环境中，在干燥和寒冷条件下，其值较大。

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