Drought sensitivity of the Amazon rainforest

Phillips Oliver L., Aragao Luiz E.O.C., Lewis Simon L., Fisher Joshua B., Lloyd Jon, Lopez-Gonzalez Gabriela, Malhi Yadvinder, Monteagudo Abel, Peacock Julie, Quesada Carlos Alberto, Van Der Heijden Geertje, Almeida Samuel, Amaral Iêda Leão, Arroyo Luzmila, Aymard Gerardo A., Baker Timothy R., Banki Olaf, Blanc Lilian, et al.. 2009. Drought sensitivity of the Amazon rainforest. Science, 323 : 1344-1347.

Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Anthropologie-Ethnologie; Economie-gestion; Psychologie-éthologie-ergonomie; Sociologie-démographie

Résumé : Amazon forests are a key but poorly understood component of the global carbon cycle. If, as anticipated, they dry this century, they might accelerate climate change through carbon losses and changed surface energy balances. We used records from multiple long-term monitoring plots across Amazonia to assess forest responses to the intense 2005 drought, a possible analog of future events. Affected forest lost biomass, reversing a large long-term carbon sink, with the greatest impacts observed where the dry season was unusually intense. Relative to pre-2005 conditions, forest subjected to a 100-millimeter increase in water deficit lost 5.3 megagrams of aboveground biomass of carbon per hectare. The drought had a total biomass carbon impact of 1.2 to 1.6 petagrams (1.2 x 1015 to 1.6 x 1015 grams). Amazon forests therefore appear vulnerable to increasing moisture stress, with the potential for large carbon losses to exert feedback on climate change.

Mots-clés Agrovoc : forêt tropicale humide, sécheresse, changement climatique, biomasse

Mots-clés géographiques Agrovoc : Amazonie

Classification Agris : P01 - Conservation de la nature et ressources foncières
P40 - Météorologie et climatologie
K01 - Foresterie - Considérations générales
F60 - Physiologie et biochimie végétale
F40 - Écologie végétale

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

• Phillips Oliver L., University of Leeds (GBR)
• Aragao Luiz E.O.C., OUCE (GBR)
• Lewis Simon L., University of Leeds (GBR)
• Fisher Joshua B., OUCE (GBR)
• Lloyd Jon, University of Leeds (GBR)
• Lopez-Gonzalez Gabriela, University of Leeds (GBR)
• Malhi Yadvinder, OUCE (GBR)
• Monteagudo Abel, Jardin Botanico de Missouri (PER)
• Peacock Julie, University of Leeds (GBR)
• Quesada Carlos Alberto, University of Leeds (GBR)
• Van Der Heijden Geertje, University of Leeds (GBR)
• Almeida Samuel, MPEG (BRA)
• Amaral Iêda Leão, INPA (BRA)
• Arroyo Luzmila, Museo de Historia Natural Noel Kempff Mercado (BOL)
• Aymard Gerardo A., Universidad Nacional Experimental de Los Llanos Occidentales Ezequiel Zamora (VEN)
• Baker Timothy R., University of Leeds (GBR)
• Banki Olaf, Utrecht University (NLD)
• Blanc Lilian, CIRAD-ES-UMR Ecofog (GUF)
• et al.

Source : Cirad - Agritrop (https://agritrop.cirad.fr/549426/)

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