SPATIO-TEMPORAL DYNAMICS OF STEPPIC LANDSCAPES: DJEBEL YOUSSEF - SETIF (ALGERIA)
Djebel Youssef, who possesses particular characteristics in terms of geographical isolation in the high Setifian plains, contains a very important floristic diversity. Currently, its plant formations were entering a phase of intense and continuous degradation, causing great distruption of the plant cover with the regression and disappearance of vulnerable and endemic species. This degradation is mainly due to anthropic action and climatic conditions, particularly recurrent periods of drought. In order to the preserve and protect this ecosystem, spatio-temporel monitoring of vegetation evolution was applied by using of landat satellite images (TM 5 and OLI 8), forming several study scenes. Knowledge of vegetation distribution and dynamics allows detecting changes in the state of vegetation cover over a 10-years period, using remote sensing and geographic information system (SIG) data. The recorded regression was estimated at 2,21 %.