Contribution to the study of the floristic diversity of steppe zone Tiaret (Algeria)

This study is devoted to steppe zone of the Tiaret region. Our work consists in highlighting the floristic biodiversity following a flora inventory, using subjective sampling - the simplest and most intuitive form of sampling - in order to obtain a database in which taxonomic, ecological and other characteristics are specified, revealing the importance of this biodiversity. The results of the flora analysis study led to the identification of 159 taxa divided into 28 botanical families and encompassing 101 genera. Endemic vegetation includes 15 taxa. As regards rarity, there are 08 fairly rare species, 01 rare species and 04 very rare species. Examination of the biological types of all the vegetation surveyed revealed that therophytes, numbering 71, dominate the scene with 45%. The Mediterranean phytochoric element is predominant with 63 species. The high perturbation index (62%) reflects a high degree of disturbance to the vegetation in this zone, which also reflects a more open environment (anthropozoic pressure). We recommend to the sustainable use of biodiversity. through the implementation of several integrated strategies.