الفهرس 
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Abstract
The author ts greatly indebted to Prof.M.A.Ayyad, Professor of Plant Ecology, Faculty of Setence- University of Alexandria for his keen supervision and guidance throughout the work, the interesting suggestions during data analysis, critical discussions and revision of the manuscript. Sincere thanks are also due to Dr.M,Abdel-Razik, Assistant Professor of Plant Ecology Faculty of Sedence- University of Alexandria for suggesting the problea, for his advices and valuable discussions.