مقايسه خصوصيات گونه هاي تاغ جهت اصلاح و گسترش آن در عرصه هاي بياباني

Comparison of saxaoul species (Haloxylon spp) for its improvement and expansion in desert areas ʹ

Desert is the biggest bioclimatic area in the world. Saxaoul (Haloxylon spp) is one of the most important stabilizing of sand dunes for biological combating desertification. For improving and development of Saxaoul lands, 40 genotypes of 3 Saxaoul species (Haag/on persicum, 11. aphyllum, H. ammodendron) were collected from different areas of Iran and planted in a replicated experiment. Several characters such as height, crown cover, trunk perimeter, branch height, branch number, powdery mildew intensity and vigority were investigated.This research was carried out in Bajestan desert plants research station from 1998-2002. The results showed, the Largest crown cover, the biggest trunk perimeter and the largest branch belong to Haoxylon persicum and H. aphyllum and the lowest powdery mildew intensity and vigority belong to H. ammodendron. Powdery mildew on H. aphvlhrm was more intensive than that on H. persicum. Vigority of H. persicum was better than that of H. aphyllum. There was a significant difference between Haoxvlon persicum, H. aphyllum, and If. ammodendron for branch number.