Non-reversible geosystem destabilisation at 4200 cal. BP: Sedimentological, geochemical and botanical markers of soil erosion recorded in a Mediterranean alpine lake
Fiche du document
2013
- ISIDORE Id: 10670/1.919fd4...
- hal: hal-00880413
- doi: 10.1177/0959683613508158
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/doi/10.1177/0959683613508158
info:eu-repo/semantics/OpenAccess
Mots-clés
4.2 ka event human pressure Mediterranean Alps soil erosion tipping point XRF core scanner Evènement de 4200 cal. BP impact anthropique Erosion des sols Alpes Méditerranéennes point de basculeSujets proches
Ecological science Environmental biology Bionomics Ecological sciences Environment Balance of nature Oecology Biology--Ecology Ecological processes Alpen Alpi Alpe AlpesCiter ce document
Elodie Brisset et al., « Non-reversible geosystem destabilisation at 4200 cal. BP: Sedimentological, geochemical and botanical markers of soil erosion recorded in a Mediterranean alpine lake », HAL SHS (Sciences de l’Homme et de la Société), ID : 10.1177/0959683613508158
Métriques
Partage / Export
Résumé
A 144-cm-long core was obtained in Lake Petit (2200 m a.s.l., Mediterranean French Alps) in order to reconstruct past interactions between humans, the environment and the climate over the last five millennia using a multidisciplinary approach involving sedimentological, geochemical and botanical analyses. We show a complex pattern of environmental transformation. From 4800 to 4200 cal. BP, podzol-type soils progressively developed under forest cover. This stable situation was interrupted by a major detrital pulse at 4200 cal. BP that we consider as a tipping point in the environmental history. At this point, pedogenetic processes drastically regressed, leading to the development of moderately weathered soils. More frequent detrital inputs are recorded since 3000 cal. BP (AD 1050) as the human impact significantly increased in the catchment area. We conclude that destabilisation of the environment was triggered by climate and exacerbated by human activities to a stage beyond resilience.
