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An Elementary Investigation of Resistant Species in Pysuma Semi-arid Region

This study was carried out in order to compare the establishment and resistance to drought in semi-arid sites of 7 needle leaved and broad leaved tree species (Pinus brutia, Cupressus arizonica, Cupressus sempervirens var. horizontalis, Tetraclinis articulata, Robinia pseudacacia, Ailanthus altissima, Celtis australis) in Tajan river basins (Pysuma region) for a period starting from 1990. The form of experiment was completely randomized blocks design with 3 replications and 7 treatments. Survival, mean collar diameter, mean height and quality parameters were determined and analyzed after 5 years. The analysis of variance showed that differences between treatments were significant; thus it can be concluded that Cupressus arizonica is the best, Celtis australis and Pinus brutia are good, Robinia pesudacacia, Ailanthus altissima, and Cupressus sempervirens var. horizontalis are in the middle stage, and Tetraclinis articulate is the worst.