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Title

Changes in erosion patterns during the Holocene in a currently treeless subalpine catchment inferred from lake sediment geochemistry (Lake Anterne, 2063 m a.s.l., NW French Alps): The role of climate and human activities

Publication Year

2011

Author(s)
  • Giguet-Covex, Charline
  • Arnaud, Fabien
  • Poulenard, Jerome
  • Disnar, Jean-Robert
  • Delhon, Claire
  • Francus, Pierre
  • David, Fernand
  • Enters, Dirk
  • Rey, Pierre-Jerome
  • Delannoy, Jean-Jacques
Source
HOLOCENE Volume: 21 Issue: 4 Pages: 651-665 Published: 2011
ISSN
0959-6836 eISSN: 1477-0911
Abstract

A high-resolution sedimentological and geochemical study was performed on a 20 m long core from the alpine Lake Anterne (2063 m a.s.l., NW French Alps) spanning the last 10 ka. Sedimentation is mainly of minerogenic origin. The organic matter quantity (TOC%) as well as its quality (hydrogen (HI) and oxygen (OI) indices) both indicate the progressive onset and subsequent stabilization of vegetation cover in the catchment from 9950 to 5550 cal. BP. During this phase, the pedogenic process of carbonate dissolution is marked by a decrease in the calcium content in the sediment record. Between 7850 and 5550 cal. BP, very low manganese concentrations suggest anoxic conditions in the bottom-water of Lake Anterne. These are caused by a relatively high organic matter (terrestrial and lacustrine) content, a low flood frequency and longer summer stratification triggered by warmer conditions. From 5550 cal. BP, a decrease in TOC, stabilization of HI and higher sedimentation rates together reflect increased erosion rates of leptosols and developed soils, probably due to a colder and wetter climate. Then, three periods of important soil destabilization are marked by an increased frequency and thickness of flood deposits during the Bronze Age and by increases in topsoil erosion relative to leptosols (HI increases) during the late Iron Age/Roman period and the Medieval periods. These periods are also characterized by higher sedimentation rates. According to palynological data, human impact (deforestation and/or pasturing activity) probably triggered these periods of increased soil erosion.

Author Keyword(s)
  • climate change
  • erosion
  • human impact
  • organic and mineral geochemistry
  • soils
KeyWord(s) Plus
  • LAND-USE IMPACTS
  • ROCK-EVAL PYROLYSIS
  • SWISS ALPS
  • ORGANIC-MATTER
  • ENVIRONMENTAL-CHANGES
  • SOIL DEVELOPMENT
  • CAL BP
  • M ASL
  • VEGETATION
  • RECORD
ESI Discipline(s)
  • Environment/Ecology
  • Geosciences
Web of Science Category(ies)
  • Geography, Physical
  • Geosciences, Multidisciplinary
Adress(es)

[Giguet-Covex, Charline; Arnaud, Fabien; Rey, Pierre-Jerome; Delannoy, Jean-Jacques] Univ Savoie, EDYTEM, CNRS Pole Montagne, F-73376 Le Bourget Du Lac, France; [Poulenard, Jerome] Univ Savoie, INRA, CARRTEL, F-73376 Le Bourget Du Lac, France; [Disnar, Jean-Robert] CNRS, ISTO, UMR 6113, F-75700 Paris, France; [Delhon, Claire] CNRS, CEPAM, UMR 6130, F-75700 Paris, France; [Francus, Pierre] INRS, Ctr Eau Terre & Environm, Quebec City, PQ, Canada; [Francus, Pierre] GEOTOP, Geochem & Geodynam Res Ctr, Montreal, PQ, Canada; [David, Fernand] CEREGE, Aix En Provence, France; [Enters, Dirk] Lower Saxony Inst Hist Coastal Res, Wilhelmshaven, Germany

Reprint Adress

Giguet-Covex, C (reprint author), Univ Savoie, EDYTEM, CNRS Pole Montagne, F-73376 Le Bourget Du Lac, France.

Country(ies)
  • Canada
  • France
  • Germany
CNRS - Adress(es)
  • Centre d'Etudes Préhistoire, Antiquité, Moyen-Age (CEPAM), UMR6130
  • Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE), UMR6635
  • Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), UMR5204
  • Institut des Sciences de la Terre d'Orléans (ISTO), UMR6113
Accession Number
WOS:000290946800011
uid:/JM756SL0
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