CONTRIBUTION TO A KINEMATIC STUDY OF THE PHYTODIVERSITY IN TLEMCEN REGION (NORTHWEST ALGERIA).

The Tlemcen region is characterized by considerable Mediterranean phytodiversity. This importance does not reflect the quantity since the majority of plant taxa are into a rare state at the study area where the concept of characteristic species. This study was developed to elucidate the kinematics of the flora between two periods (1963 and 2013) based on the degree of abundance and rarity. To do this, we had to ask the following questions: What are the factors that influence the evolution of phytodiversity? In what state is? What solutions and perspectives can be drawn to protect and preserve this plant diversity? The analysis showed a change in phytodiversity translated by an extreme regression of the vegetation whose the census reveals 257 taxa. The grasses were minor during the old period (1963) while they became abundant during the new period (2013). Unlike the tree layer was abundant during the old period (1963) while it has become rare in the new period (2013). A rational management of phytodiversity expressed by protected sites as well as awareness remains an indispensable procedure to undertake to fight against the erosion of our plant heritage.