Due its geographical situation, the South slope of the Natural Protected Area “ Sierra de Lobos “ in Guanajuato plays a fundamental role in the water recharges of the aquiferous mantles and water bodies that supply the León City in Guanajuato. The case of the microbasin “Las Amapolas” performs particular importance for supplying to León City of drinkable water and for being most of surface inside the Natural Protected Area “Sierra de Lobos”. This study shows an analysis of the dynamics in the change of use of the land during the period from 1974 to 2007 using a methodology based on the analysis of the cartography and available air photos for the area in question. Results show a clear deterioration of the vegetation coverage due the reduction of natural vegetation units and the increase of the vegetation of disturbance. It performs supreme importance to implement managing plans for the mitigation, and the restoration of the area.

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