The study ecological of Astragalus squarrosus Bunge in Kashan Rige-Boland sandy dunes

Astragalus squarrosus Bunge is a desert and psammophyte shrub with stem erect, branches between 50-150 cm long and in some of the habitat is 190 cm long. This is a species of shrub of genus Astragalus L., without spine and eating well. This plant distribute in appear of wide plant formation in sandy dunes of arid and super arid in central, south-eastern and north-eastern desert of Iran. In orther to study of ecological properties of this plant, we had selected 3 various habitates in kashan Rige-Boland sandy dunes. After that we determined minimal area and defined measure of plant and density of canopy of spices companion. Then we study properties of stem and root branches. We defined som of the base and then measure biomass of stem and root organs. After that we refer to habitat, every 15 days and defined phenology of this plant. We had done physico- chemical analysis of habitat soil in the depths of 0-40 cm. and 40 – 80 cm. and then we take sampling from young stem and then we had done chemical analysis. Results show that Astragalus squarrosus Bunge habitats in Kashan desert sandy dunes is placed in varied altitude between 750 –1100 meter from sea level. The soil struction of Astragalus squarrosus Bunge habitat shows that it have sandy texture with gipsy layer. The average number of plants in every a hectar is between 3125 -15625, the average of forage is between 62 – 312 kilogram of dry material in every hectar. Such a mounting plant protein is 7 percent. The most prominent companion plants elements are as follows: Salsola tomentosa, Salsola arbuscula, Cyperus eremicus, Stipagrostis plumosa,Convolvulus eremophilus. Phenology studies of this plant show that the beginning of growing period happen in March. The appearance of buds of flower in the middle of Avril, fruit formation is in the end of June, and during July and August is going to seed. Summer dormancy countinue in during August to October. Regrowing of plant is in middle of October and Winter dormancy begin in December.