The impact of climate changes during the Holocene on vegetation in northern French Guiana

Freycon Vincent, Krencker Marion, Schwartz Dominique, Nasi Robert, Bonal Damien. 2010. The impact of climate changes during the Holocene on vegetation in northern French Guiana. Quaternary Research, 73 (2) : 220-225.

Quartile : Q1, Sujet : GEOSCIENCES, MULTIDISCIPLINARY / Quartile : Q1, Sujet : GEOGRAPHY, PHYSICAL

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Géographie-Aménagement-Urbanisme-Architecture; Histoire; Histoire, histoire de l'art, archéologie

Résumé : The impact of climatic changes that occurred during the last glacial maximum and the Holocene on vegetation changes in the Amazon Basin and the Guiana Shield are still widely debated. The aim of our study was to investigate whether major changes in vegetation (i.e. transitions between rainforests and C4 savannas) occurred in northern French Guiana during the Holocene. We measured variations in the ?13C of soil organic matter at eight sites now occupied by forest or savannah. The forest sites were selected to cover two regions (forest refugia and peneplains) which are thought to have experienced different intensities of disturbance during the latest Pleistocene and the Holocene. We found that none of the forest sites underwent major disturbances during the Holocene, i.e. they were not replaced by C4 savannahs or C4 forest savannahs for long periods. Our results thus suggest that tropical rainforests in northern French Guiana were resilient to drier climatic conditions during the Holocene. Nevertheless, geographical and vertical variations in the 13C of SOM were compatible with minor changes in vegetation, variations in soil processes or in soil physical properties.

Mots-clés Agrovoc : changement climatique, végétation, forêt tropicale, résistance à la sécheresse, isotope, carbone, matière organique du sol, teneur en matière organique, évolution, forêt, savane

Mots-clés géographiques Agrovoc : Guyane française, France

Classification Agris : P40 - Météorologie et climatologie
K01 - Foresterie - Considérations générales
F70 - Taxonomie végétale et phytogéographie
B50 - Histoire

Champ stratégique Cirad : Hors axes (2005-2013)

Auteurs et affiliations

• Freycon Vincent, CIRAD-ES-UPR Dynamique forestière (FRA)
• Krencker Marion, Université de Strasbourg (FRA)
• Schwartz Dominique, Université de Strasbourg (FRA)
• Nasi Robert, CIRAD-ES-UPR Ressources forestières (FRA)
• Bonal Damien, INRA (GUF)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/553658/)

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