الفهرس 
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Abstract
The present thesis is aiming at throwing more lights on the vegetation of the salt affected lands of the Nile Delta in both coastal and inland parts and to find out the relationships between such vegetation types and surrounding environmental factors. Also, evaluation of the nutritional values of some selected species. Nineteen sampling quadrats were selected to represent the salt affected sites in the five provinces of the study area namely: Port Said, El-Dakahlia, Damietta, Kafr El-Sheikh and El-Behira. The results indicate that, the total number of the recorded species in the study area is 86 species belonging to 65 genera and related to 24 families. Poaceae, Asteraceae, Chenopodiaceae and Polygonaceae are the main families representing collectively about 58.12% of the total number of recorded species in the study area. According to the life-span, the recorded taxa can be classified under three categories as follows: Annuals: 41 species (48.8%), Biennials: one species (1.2%) and Perennials: 44 species (50.0%). The present study indicates that, therophytes are the most frequent life-form in the salt affected habitats of the study area being represented by 43 species (48.32%). The other life-form spectra are: cryptophytes (19.1%), hemicryptophytes (11.24%), chamephytes (13.48%), phanerophytes (6.74%) and parasities (1.12%). The economic-fodder potentialities of three selected species growing naturally in the study area have been evaluated. These selected plants are: Atriplex halimus, Limoniastrum monopetalum and Limonium pruinosum. The phytochemical analysis of the investigated species were carried out to detect their chemical composition. The mean values of moisture content, dry matter, ash, crude lipids, crude fiber, crude protein, total soluble sugars, glucose, sucrose, polysaccharide, and element were estimated. The determination of the proximate composition revealed the presence of high percentages of lipids, crude fibers, crude protein and macro and micro-elements. On the other hand, the results of estimating the secondary active constituents revealed the presence of high percentages of phenolics, alkaloids, flavonoids, tannins and saponins in Limoniastrum monopetalum and Limonium pruinosum.