الفهرس 
Materials and methodsOnly 14 pages are availabe for public view
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Abstract
A total of 109 plant species were recorded in the River Nile at Dakahlia and Damietta provinces belonged to 83 genera and grown in three different habitats (99 River bank, 13 Floating and 4 Submerged). Many species restricted to Damietta Province and absent from Dakahlia region. Myriophllum spicatum grows only in Dakahlia and absent from Damietta. Cyperus papyrus and Pistia stratiotes were recorded in a single stand near Damietta. Six groups of plants are identified using TWINSPAN in the studied sites. These groups are indicated by Pluchea dioscoirodis, Persicaria tomentosa, Cyperus articulatus, Typha domengensis, Cyperus laevigatus and Juncus rigidus and Cyperus laevigatus and Suncus acutus. Environmental factors affecting the growth and abundance of plants in the study sites are conductivity, total hardness, Na+, K+, Cl, total phosphorus, total nitrogen, and pH of the water, and K+, Na+, pH, totalN, organic carbon, CaCO3 of soil. The surface water characteristics, such as, pH, total dissolved solids, electric conductivity, total alkalinity, total hardness, ammonia, total nitrogen, total phosphorus, chloride, sodium, and potassium were detected along the study areas. The soil characteristics, such as, pH, conductivity, calcium carbonates, organic carbon, total nitrogen, total phosphorus, sodium, and potassium were detected along the study areas. The phytochemical analysis of the leaves and culms of Phragmites australis in the study area was done. The Person moment correlation between the different water, soil variables and concentration of Na+, K+, totalP and totalN in the leaves and culms of Phragmites australis was done. The growth of Cyperus laevigatus and Cyperus articulatus was experimented under different water levels in different nutrient levels. The results of this experimented showed that the water level and the nutrient concentration affected positively or negatively the growth parameters and chemical composition of both Cyperus laevigatus and Cyperus articulatus. The obtained results will be usefull for optimal management of water, soil and vegetation of the Nile at Damietta and Dakahlia.