عنوان مقاله [English]
Salinity limits production of agricultural and natural resources crops of the world. Plant production decreases in areas containing saline soils or irrigated with saline water. Because most soils in arid and semiarid areas are alkaline and saline and Populus euphratica Oliv is a well-adapted plant in such soils, identification of its tolerance salinity is very import, particularly in Iran. In order to evaluate the effect of salinity on growth and chemical composition of leaves, stems and roots, a glasshouse trial was conducted, using statistical design of randomized complete blocks (RCBD) with three replicates. The rooted cuttings of P. euphratica were inserted in Hogland soil-less culture and after 15 days were treated with five leaves of NaCl and CaCl2 (0, 0.27, 0.54, 0.81 and 1.08% or 1.3, 6.1, 10.5, 13.5 and 18 ds/m) at 4: 5 ratio, respectively. The measured variables were survival, leaf appearace, height, leaf number and area, dry weight of leaves, stem and roots, and percentage of Na+, Cl -, Ca++, Mg++, K+ and N - at leaves, stem and roots. The results showed that salinity did not significantly affect leaf and stem dry weight at 6 ds/m of salinity but over 6 ds/m the root dry weight decreased significantly. Althoush leaf number decreased significantly by increase in saline levels, but root dry weight and seedling's height have not been influenced by salinity, significantly. Increase in saline levels, increased N- and K+ in leaves and Na+, K+, Mg++ and Cl- in branches. The root elements have not been influenced by salinity, except Cl-.