Ravonjimalala H.R., Boagaert J., Hervé Dominique, Razanaka S., Ranaivo J., Randriambanona H., Rakotondraompiana S. (2017). Spatio-temporal evolution of the fragmentation classes of th Mikea dry deciduous forest (Southwestern Madagascar). In :
Ouessar M. (ed.), Gabriels D. (ed.), Tsunekawa A. (ed.), Evett S. (ed.). Water and land security in drylands : response to climate change. Cham : Springer, p. 209-219. ISBN 978-3-319-54020-7.
Titre du document
Spatio-temporal evolution of the fragmentation classes of th Mikea dry deciduous forest (Southwestern Madagascar)
Année de publication
2017
Type de document
Partie d'ouvrage
Auteurs
Ravonjimalala H.R., Boagaert J., Hervé Dominique, Razanaka S., Ranaivo J., Randriambanona H., Rakotondraompiana S.
In
Ouessar M. (ed.), Gabriels D. (ed.), Tsunekawa A. (ed.), Evett S. (ed.), Water and land security in drylands : response to climate change
Source
Cham : Springer, 2017,
p. 209-219 ISBN 978-3-319-54020-7
In southwestern Madagascar, the Mikea forest is a highly diverse ecosystem of great biodiversity, whiëh mixes dry deciduous forest in the eastern part and xerophytic thicket in the western coastal area. However, dry forests and shrubs are rapidly destroyed due to slash-and-burn cultivation (hatsaky) and exploitation offorest resources by riparian communities and extemal operators. The aim of this paper is to evaluate forest fragmentation in the Mikea national park, by comparing past and recent forest maps. The analysis of forest fragmentation is based on landscape indices. The changes in forest cover have been detected from time-series SPOT satellite images registered over 15 years (1999, 2005, and 2014). Between 1999 and 2014, forest area is reduced by 39.8% which is equivalent to an annual forest Joss rate of 4.6%. The forest fragmentation is associated with a significant decrease in forest patch size. The mean patch size decreases from 37,228 to 18,731 ha from 1999 to 2014. The primary direct causes are economic driven due to intense anthropogenic activities such as wood charcoal production, Jogging, accompanied by frequent wild land tires. The indirect cause is the absence of a sustainable environmental management and conservation strategy.
Plan de classement
Formations végétales [082VEGET02]
;
Végétation / Forêt [126TELAPP08]
Descripteurs
DEFORESTATION ; FORET DENSE SECHE ; GESTION DE L'ENVIRONNEMENT ; CONSERVATION DE LA NATURE ; ANALYSE SPATIALE ; IMAGE SATELLITE ; CLASSIFICATION ; BRULIS ; BIODIVERSITE
Description Géographique
MADAGASCAR
Localisation
Fonds IRD [F B010074623] ;
Montpellier (Maison des Sciences de l'Eau)
Identifiant IRD
fdi:010074623
