Spatio-Temporal Floristic Study Of The Saharan Rangelands Of South-East Algeria Case Of The Souf And Ouedrigh Regions

Abstract

The present work is a study of the floristic composition in the region of Souf and OuedRigh. It is carried out in four stations, according to the different geomorphological forms (Wadi beds, Reg, Erg, Dirty soils, Chott). The sampling of the flora revealed the existence of 26 spontaneous species belonging to 15 botanical families, of which 10 families are represented by only one species. AMARANTACEAE with 05 species, 19.23% of the total number of species, are the most represented family, followed by POACEAE with 4 species (15.38%), BRASSICACEAE with 03 species (11.53%) and ZYGOPHYLLACEAE and FABACEAE with 2 species (7.69%) each. According to the biological category, perennials have 19 species, and ephemeral 7 species, with; in the Erg 15 species (10 perennials, 5 ephemeral), the wadi beds 14 species (12 perennials, 2 ephemeral), the Reg 8 species (5 perennials, 3 ephemeral), the dirty soils 5 perennial species, and the chott4 perennial species.

The distribution of these species is different in space and time, remains heterogeneous and uneven from one biotope to another and from one season to another. The distribution of species is linked to the influence of several factors, namely: geomorphology, the variability of floristic associations, drought, salinity, humidity and the nature of the soil. They are grouped according to their ecological affinities.