The present study, which was conducted between 29 and 21, provides an analysis of the floristic composition, life forms, phenology, chorological spectrum and analysis of the vegetation in the deltaic part of Wadi Qena using multivariate analysis techniques. Twenty-five stands were sampled to represent, as much as possible, the vegetation variation in the study area. A total of 54 species (nineteen annuals and 35 perennials) belonging to 47 genera and nineteen families were recorded. The largest families were Fabaceae and Brassicaceae (nine and seven, respectively), Asteraceae and Poaceae (six for each), Chenopodiaceae (five), and Zygophyllaceae (four). Therophytes are the predominant life form (37%) followed by chamaephytes (24%), phanerophytes (18.5%), hemicryptophytes (9.29%) and cryptophytes (5.5%). Chorological analysis revealed that Saharo-Arabian (48%) and the Sudano-Zambezian (19.2%) chorotypes constitute the main bulk (67.2%) of the total flora of the studied area. The majority of the perennial species behave similarly to each other in their phenology, and usually perennials sprout at the end of February, become leafy in March, flower in April and produce fruits between April and July. Three main vegetation groups resulted from classification of the dominant vegetation. Canonical correspondence analysis revealed that magnesium, potassium and pH were the most effective soil variables.Réalisée en 29 et 21, cette étude donne une analyse de la composition floristique, des formes de vie, de la phénologie, du spectre chorologique et une analyse de la végétation dans la partie deltaïque de l'Oued Qena en utilisant des techniques d'analyses multivariées. Des échantillons furent prélevés en 25 endroits afin de représenter autant que possible la variation de la végétation dans la zone étudiée. Au total, on a relevé la présence de 54 espèces (19 annuelles et 35 pérennes), appartenant à 47 genres et à 19 familles. Les plus grandes familles étaient les Fabaceae et les Brassicaceae (9 et 7 respectivement), les Asteraceae et les Poaceae (6 chacune), les Chenopodiaceae , les Zygophyllaceae . Les thérophytes sont la forme vivante prédominante (37%) suivis par les chamaephytes (24%), les phanérophytes (18.5%), les hémicryptophytes (9.29%) et les cryptophytes (5.5%). L'analyse chorologique a révélé que les chorotypes saharo-arabe (48%) et soudano-zambézien (19.2%) constituent la plus grande partie (67.2%) du total de la flore dans la zone étudiée. La majorité des espèces pérennes se comportent de façon similaire dans leur phénologie : d'habitude, les pérennes sortent à la fin de février, font des feuilles en mars, fleurissent en avril et produisent des fruits entre avril et juillet. La classification da la végétation dominante aboutit à trois groupes de végétation principaux. Une analyse ACC a révélé que le magnésium, le potassium et le pH sont les variables du sol les plus efficaces.
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