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Tropical forest phenology in French Guiana from MODIS time series

Pennec Alexandre, Gond Valéry, Sabatier Daniel. 2011. Tropical forest phenology in French Guiana from MODIS time series. Remote Sensing Letters, 2 (4) : pp. 337-345.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q3, Sujet : IMAGING SCIENCE & PHOTOGRAPHIC TECHNOLOGY / Quartile : Q3, Sujet : REMOTE SENSING

Abstract : Despite a growing need for knowledge on how terrestrial ecosystems function, phenological studies are rather rare. This study characterizes the temporal evolution of forest covers in French Guiana using variations in the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite signal and vegetation indices, such as the Shortwave Infrared Water Stress Index and the Enhanced Vegetation Index. The principle consists of reconstructing a temporal cycle mosaiced from a 9-year database. Rather than extract the phenological information from each pixel, dynamics were extracted from homogeneous groups of forest pixels enabling the identification of different phenological phases in forest ecosystems. A north-south gradient of chlorophyll activity emerged. The further we moved to the south, the more forest groups consist of fast-growing and drought-tolerant species, whereas a north-south shift appeared at the start dates of phenological cycles. This is a promising approach that paves the way for a much deeper understanding of the mechanisms governing the rainforest in French Guiana, as well as the responses of the Amazon forest to climate change and drought in the long term. (Résumé d'auteur)

Mots-clés Agrovoc : forêt tropicale, Changement climatique, Phénologie, Dynamique des populations, peuplement forestier, Composition botanique, Écosystème forestier, Écologie, adaptation aux changements climatiques, Croissance, Résistance à la sécheresse, Satellite, Spectroscopie infrarouge, Couverture végétale

Mots-clés géographiques Agrovoc : Guyane française

Mots-clés complémentaires : Arbre à croissance rapide

Classification Agris : K01 - Forestry - General aspects
F40 - Plant ecology
P40 - Meteorology and climatology
U30 - Research methods

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

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Source : Cirad - Agritrop (https://agritrop.cirad.fr/557769/)

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