Etude phytoecologique des plantes rupicoles et chasmophytes du Sahara Septentrional Algerien dans la willaya de Ghardaia (Cas de la commune de Metlili)

Abstract

This work consisted of a phytoecological study of the rupicultural and chasmophyte vegetation in the northern Sahara of the metlili commune. We selected four stations, one at GAADA zone, one at GEMGOUMMA and one at CHAABET SID CHIKH and one last zone GAADA ver SEBSEB We noticed the level of station 02 and 03 the flora is very rich compared to station 01 and 04. We have recorded 26 species spread into 16 families, the most present being Asteraceae with a rate of 23.07%. The density is between 100 people and 1 individual throughout the four It is noted that the species Diplotaxis harra is the most abundant in station 01, Cleome arabica is abundant in stations 02 and 03; the species Moricandia arvensis is abundant in the station 04. The frequency varies between 100% a 14.28 % in stations whose species Moricandia arvensis attien maximum followed by pergularia tomentosa .