چكيده لاتين :
The present research comprises an investigation of the vegetation analysis, a quantitative assessment of the soil and water characteristics and an evaluation of the relationship between the major
identified vegetation groups and the environmental attributes of the canals, drains and their wet shorelines at four governorates in North East Nile Delta, namely: Damietta, El Dakahlya, El Sharkia and Al Qaliopia. Vegetation, soil and water were sampled in 65 representative stands. The floristic categories, life span and lifeforms of the recorded species were described. The soil and water characteristics were determined for each stand. The vegetation analysis was carried out using the multivariate techniques. The classification (TWINSPAN) and
ordination (DCA) techniques of the stands led to recognition of four vegetation groups: group A codominated by Veronica anagallis-aquatica, Potulaca oleracea and Cynodon dactylon, group B codominated by
Rumex dentatus, Phragmites australis and Cynodon dactylon, group C codominated by Phragmites australis and Echinochloa stagnina and group D codominated by Phragmites australis and Bolboschoenus glaucus. Canonical Correspondence Analysis (CCA) was applied to detect the main environmental factors influencing the vegetation groups. The electrical conductivity, calcium, sodium, potassium, magnesium, total nitrogen, chlorides and bicarbonates are the most effective environmental variables, which showed significant correlations with the first and second ordination axes. Accordingly, these soil and water variables seem to be the major ecological factors control the distribution of vegetation in the study area.
