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A millennial record of environmental change in peat deposits from the Misten bog (East Belgium)

De Vleeschouwer, François and Pazdur, Anna and Luthers, Cédric and Streel, Maurice and Mauquoy, Dmitri and Wastiaux, Cécile and Le Roux, Gaël and Moschen, Robert and Blaauw, Maarten and Pawlyta, Jacek and Sikorski, Jarek and Piotrowska, Natalia A millennial record of environmental change in peat deposits from the Misten bog (East Belgium). (2012) Quaternary International, 268. 44-57. ISSN 1040-6182

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Official URL: http://dx.doi.org/10.1016/j.quaint.2011.12.010

Abstract

In this study, palaeoenvironmental changes recorded in the top metre of a peat profile (Misten bog, East Belgium) were investigated using a multiproxy approach. Proxies include bulk density, Ti and Si content, pollen, macrofossils, d13C on specific Sphagnum stems, and d13Ced18O on Sphagnum leaves. A highresolution chronology was generated using 210Pb measurements and 22 14C AMS dates on carefully selected Sphagnum macrofossils. d13C only records large change in mire surface wetness. This is partly due to the fact that the core was taken from the edge of a hummock, which may make it difficult to track small isotopic changes. The d13C signal seems to be dependent upon the Sphagnum species composition. For example, a change between Sphagnum section Cuspidata towards Sphagnum imbricatum causes a significant drop in the d13C values. On the whole, the C and O isotopes record two shallow pool phases during the 8the9th and the 13th centuries. Pollen and atmospheric soil dust (ASD) fluxes records increased human occupation in the area. There may be some climatic signals in the ASD flux, but they are difficult to decipher from the increasing human impact (land clearance, agriculture) during the last millennium. The variations in the proxies are not always synchronous, suggesting different triggering factors (temperature, wetness, windiness) for each proxy. This study also emphasizes that, compared to studies dealing with pollution using geochemical proxies, palaeoclimatic inferences from peat bogs need as many proxies as possible, together with highly accurate and precise age-models, in order to better understand climate variability and their consequences during the Holocene.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Quaternary International website : http://www.sciencedirect.com/science/article/pii/S1040618211006963
HAL Id:hal-00984220
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université de Liège (BELGIUM)
Other partners > Forschungszentrum Jülich GmbH (GERMANY)
Other partners > Queen's University Belfast - QUB (UNITED KINGDOM)
Other partners > Silesian University of Technology (POLAND)
Other partners > University of Aberdeen - ABDN (UNITED KINGDOM)
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Deposited By: Gael Le Roux
Deposited On:16 Apr 2014 09:28

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