EDP Sciences Journals List
Free access article

Issue Nat. Sci. Soc.
Volume 13, Number 1, Janvier-Mars 2005
Page(s) 7 - 20
DOI 10.1051/nss:2005002

Natures Sciences Sociétés 13, 7-20 (2005)
DOI: 10.1051/nss:2005002

Article

Une alliance de disciplines sur une question environnementale : la déforestation en forêt des Mikea (Sud-Ouest de Madagascar)

Chantal Blanc-Pamarda, Pierre Millevilleb, Michel Grouzisc, Florent Lasryd and Samuel Razanakae

a  Géographe, CNRS, CEAf EHESS, 54 Bd Raspail, 75006 Paris, France
b  Agronome, IRD, BP 64501, 34394 Montpellier cedex, France
c  Écologue, IRD, BP 434, 101 Antananarivo, Madagascar
d  Géomaticien, GIS & Remote Sensing Training and Research Center, National University of Rwanda, BP 212, Butare, Rwanda
e  Phytogéographe, CNRE, BP 1739, 101 Antananarivo, Madagascar

Abstract
The GEREM Program (Management of Rural Areas and the Environment in Madagascar) was conducted between 1996 and 2002 in south-western Madagascar. One result of the partnership between the three sciences was the highlighting of deforestation as a major environmental problem. Scientific findings point to the extent of deforestation, its irreversible character, and the resulting loss of biodiversity. Satellite imagery has provided a useful tool for comparing results. The forest of the Mikea, some 100 kilometres from Tulear, was used as an example because of the extent and speed of biodiversity loss. The extent of deforested areas has quadrupled since the late 1980s. Essentially, the cause of deforestation is the slash-and-burn cultivation of corn (maize), locally known as hatsaky. Due to the dynamic interplay between the types of environments and the changing use of land, addressing environmental issues from the angle of each separate discipline is no longer helpful. This study calls for a multidisciplinary and territorialized approach to environmental problems. The GEREM Program seeks to both understand the emerging environmental problem and identify the research issue. By combining agriculture and the environment with time and space scales, the research team has pooled its scientific investigations and produced findings that can be used by all three sciences.


Résumé
Dans le Sud-Ouest de Madagascar, de grands massifs forestiers sont affectés par un processus de déforestation de grande ampleur, en raison de l'expansion de la culture du maïs sur abattis-brûlis. Dans la forêt des Mikea, site retenu pour son exemplarité par le programme GEREM, le rythme de défrichement a ainsi quadruplé depuis les années 1980. La recherche, conduite de 1996 à 2002, a permis d'évaluer l'ampleur du phénomène, son caractère irréversible, la perte de biodiversité et les changements d'usage des ressources qui en résultaient. Elle a explicité les relations dynamiques entre des types de milieux et des espaces qui changent de nature et d'affectation, ainsi que les stratégies d'acteurs qui leur sont associées. Par-delà les questions, approches et niveaux d'investigation spécifiques de l'écologie, de l'agronomie et de la géographie, cette expérience de recherche montre que les problèmes d'environnement imposent des démarches plus intégrées aux échelles territoriales. Le couplage des questions agraire et environnementale, tout comme celui du temps et de l'espace, appliqué à l'analyse de situations en mutation rapide, ont ainsi créé les conditions d'une réelle alliance entre chercheurs relevant des sciences de la nature, des sciences biotechniques et des sciences sociales.


Key words: deforestation; slash-and-burn agriculture; environment; time; territory; local knowledge; interdisciplinarity; Madagascar

Mots clés : déforestation ; culture sur abattis-brûlis ; environnement ; temps ; territoire ; savoirs locaux ; transdisciplinarité ; Madagascar ; Sud-Ouest

Corresponding author: C. Blanc-Pamard Chantal.Blanc-Pamard@ehess.fr

© NSS-Dialogues, EDP Sciences 2005


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