Contribution À L’étude Phytoécologique D'ephedra Alata (ephedraceae) Dans La Région De Ouargla

Résumé: Contribution to the phytoecological study of Ephedra Alata (Ephedraceae) in the Ouargla region sums up: the plant cover of the Sahara has a system of adaptation very specific to Saharan environmental conditions. The phytoecological study is necessary for any preservation project. Our work has focused on the ecology of the Ephedra alata species according to different stations and seasons, a species with pastoral, medicinal and pharmacological interests. The study is carried out in 03 study stations Hassi Ben Abdallah, El Hadjira and Oued N’SA Following the presence of Ephedra Alata, the subjective sampling according to the minimum air has made it possible to identify 18 species associated with E. alata, divided into 13 families. The Amaranthaceae, the Brassicaceae and the Poaceae, are the most represented families. The flora richness is very poor in the Hassi ben Abdallah and El Hadjira station, and poor in the Oued N’Sa station. Depending on the morphological type, perennials have 08 species and the ephemera correspond to 10 species. The biodiversity between the stations is high, the floristic difference is strong in the stations. Therophytes are the most common with 41.18%, followed by chamaphytes29.41% and hemicryptophytes 17.65% respectively.

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