Title: Pre-alpine mire sediments as a mirror of erosion, soil formation and landscape evolution during the last 45 ka
Authors : Jäger, Hans
Achermann, Matthias
Waroszewski, Jarosław
Kabała, Cezary
Malkiewicz, Małgorzata
Gärtner, Holger
Dahms, Dennis
Krebs, Rolf
Egli, Markus
Published in : Catena
Volume(Issue) : 128
Pages : 63
Pages to: 79
Publisher / Ed. Institution : Elsevier
Issue Date: May-2015
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Mire sediments; Soil evolution; Erosion; Dating; Quaternary
Subject (DDC) : 500: Natural sciences and mathematics
Abstract: Peat and lake sediments as well as a nearby soil catena were sampled to reconstruct the environmental history of a small infilled lake basin (mire) in the central alpine foreland of Switzerland. Soil evolution is best regarded as discontinuous over time and conceptualised by ‘progressive’ or ‘regressive’ process phases. We analysed the surrounding soils and used corresponding pedosignatures in the mire sediments to characterise notable phases of erosion and deposition. We assumed that the mire sediments would reflect these phases, that elemental composition (major and minor compounds) and rare earth elements (REEs) would allow us to differentiate past processes and that progressive and regressive phases of soil development can be discerned. Although radiocarbon ages are equivocal, it appears from pollen analyses that a lake was present here by c. 45 ka BP. After the retreat of the glacier from this area following the LGM, continuous sedimentation occurred until a mire developed during Pleistocene–Holocene transition. This transition period was accompanied by more intense erosion, as characterised by chemical signatures. A stable phase developed between c. 10–5 ka BP giving rise to progressive soil evolution. Between 5 and 4 ka BP, evidence appears for several erosional phases, predominantly detectable at the margin of the mire. These erosion phases, coupled with accumulation in the mire, are even more evident after 4 ka BP and especially after 2.1 ka BP. Based on soil investigations, elemental fluxes are detected along the slopes with distinct accumulations at the footslope. Evidence for anthropogenic influences and subsequent regressive soil formation phases appear in this pre-alpine landscape about 5 ka BP (Neolithic/Early Bronze Age), which appears to intensify after 2.1 ka BP (Roman period to present). Multi-elemental signatures enabled us to identify the important geochemical processes that have occurred here. Together with radiocarbon and pollen analyses, we placed these processes in a logical temporal context. The use of lacustrine (lake or mire) sediments has great potential to decipher and detail the surrounding landscape history and soil evolution of this region of Switzerland.
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Publication type: Article in scientific Journal
DOI : 10.1016/j.catena.2015.01.018
ISSN: 0341-8162
URI: https://digitalcollection.zhaw.ch/handle/11475/11624
Appears in Collections:Publikationen Life Sciences und Facility Management

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