الفهرس 
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Abstract
South Sinai is characterized by an ecological uniqueness being a bridge between Asia and Africa , diversity of landforms ,geologic structures and climate .Harvesting having for fuel and medicinal use overgrazing urbanization and quarrying are the main threats affecting the vegetation Environmental deterioration is evident in the decrease of plant cover .
The study area represents :Wadi El-Arbain ,Wadi Shaq –Mousa, ,Wadi El Gragnia Wadi Hamata Wadi El –Toffaha Wadi El – Faraa ,Wadi El-Raha Wadi El- Dair ,Wadi El- Talaa Wadi Telah Wadi Abu –Saila Wadi jebal , Wadi El- Sabaiya Wadi Sidood , Wadi Um-Ksum , Wadi Saal , Wadi El-Achdar , WadiSolaf Wadi Sheikh-Awed , Wadi El-Sheikh , Wadi Nyssrain and Wadi Moktaab .
The present study foused on the assessment of Wadi systems in south Sinai based on studying the interaction between water availability ,soil properties and vegetation units .Three hundred and seventeen stands were selected in 22 Wadis in south Sinai for vegetation and soil sampling Sixty –four stands were selected in Wadis for seed bank study .
Analysis of variance ,Tukey’s test ,correlation and regression were carried out using SPSS software to evaluate the site characteristics ,the interrelationships between different variables and to clarify the relation between environmental factors , Wadi system and vegetation distribution Multivariate analyses were carried out using PC-ORD software to classify the different stands into groups according to the vegetation composition ( TWINSPAN: Two –Way Indicator Species Analysis).