HR: 0830h
AN: GC41A-01    [Abstracts]
TI: Followed and Surveillance of the Desertification Phenomenon with Remote Sensing Data ~ ALSAT-1 ~ in Semi-Arid Zones (steppe of Algeria)
AU: * ZEGRAR, A
EM: z_ahmed65@yahoo.fr
AF: National Center of Spaces Technics, BP 13, CNTS, ARZEW, 31200 Algeria
AB: The degradation of the natural resources in the arid and semi arid land has drastically been emphasized during this century because of the demographic growth and the transformation of the land use systems. The extension of the cultivated areas in the marginal land and the cattle growth led to different processes of degradation, green cover destruction, over pasture land erosion and their fertility deterioration. The steppe in Algeria is presented in the form of pathways of Alfa and for the majority; these pathways are degraded with low recovery. This, under the aridity affect of the medium and the over pasture which is being forced on this pathways makes the degradation process worse for the physical medium and then lead to desertification. All the time, the politicians have been searching with more or less success to master the natural resources and to diminish the aggressive effects exerted by man in a conscience or no conscience manner on the medium. With all these problems to which the Algerian steppe allowing the determination of the lands, being damaged by desertification. And also to better use the pastoral resources. The work is mainly based on the classification criteria of the arid lands and the steppe, these criteria are numerous, climatic, phytogeographic, pedology and agronomic. The approach is based on the Land sat data of ALSAT-1 images completed with terrain observation. With regard to the ecosystem fragility a synthesis chart was designed. Keywords: semi arid land, degradation, steppe and pathways, over pasture, desertification, and pastoral resources.
DE: 1620 Climate dynamics (3309)
DE: 1630 Impact phenomena
DE: 1640 Remote sensing
DE: 1645 Solid Earth
SC: Global Climate Change [GC]
MN: 2005 Joint Assembly