Author : Mohamed Abba, Ali Essahlaoui [ Volume No.:VI, Issue No.VI-Nov 2017] [Page No : 774-776] [2017]

Errachidia - Tafilalet region located in the southern Atlas of Morocco, is facing enormous difficulties combining scarcity and poor quality of water then long periods of severe drought that have affected recent decades, whose ecological consequences are considerable, as evidenced by the decline in the irrigated area under the action of desertification and rising saline soils.The use of remote sensing and GIS enabled to understand the dynamics of land use. In this paper we have used three imagery satellite Landsat (TM 1987, ETM+ 2001, ETM+2006) for a diachronic analysis, to assess and monitor the change of the palm in the Middle Ziz. We managed to show the levels of evolution in terms of differential use of space, soil degradation, regeneration of the environment, resilience, and finally, the segmentation of the territory. Low rainfall, dry years have a very negative effect on the surface water reserves, agricultural production, but also the movement of sand and silting.