نوع مقاله : علمی- پژوهشی
نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In order to creat parks and recreational areas around cities, it is essential to introduce adaptable and resistant tree species to arid and semi arid areas in rainfed condition. On this base, research trials were laid out to determine the adaptability of some hard and soft wood species at unirrigated conditions in Imamieh and El-goli suburbs of Tabriz city in East-Azarbeidjan. The species under study in Imamieh were Elaeagnus angustifolia, Pinus nigra, Fraxinus rotundifolia and Ailanthus glandulosa; and in El-goli, were pinus nigra, Cupressuus arizonica, Pyrus syriaca, Fraxinus rotundifolia and Robinia pseudoacacia. 25 seedlings were planted in each experimental plot considering 3m. interval. The experimental design in each site was randomized complete block. During the growing season the survival % and in the end of the growing season the height and diameter of species were measured. The flora and soil characteristics of the growth parameters were compared, using Duncanʾs multiple range test at 5% probability level. Collected data related to the survival rates were normalized prior to the analysis, using Sin transformation.
In Imamieh, the analysis of variance over years as split plot in time, showed significant survival %.
However, the year × species interaction was not significant. This means that the difference in survival % of species was the same from one year to another. There was significant differences between years. In this location, Pinus nigra had the lowest and Elaeagnus angusifolia had the greatest height and diameter among the species all over the years. In El-goli considering the growth parameters means of four years. Survival % of Fraxinus rotundifolia was statistically lower then Cupressus arizonica, Pyrus syriaca and Rubinia pseudoacacia. However, annualy, Pinus nigra aequired the greatest relative height and diameter growth, showing a significant defference with other species. The overall results obtained during years of experiment reveal that all of the planted species under rain fed conditions had suitable adaptability in El-goli location. However the mean relative height and diameter growth of Pinus nigra, Cupressus arizonica and pyrus syriaca were greater as compared to Robinia pseudacacia and Fraxinus rotundifolia species. It may be concluded that there is possibility for adaptation of some rainfed species in the experimental site.
کلیدواژهها [English]
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