A Study of site Conditions in Natural Forests of Christ-thorn Ziziphus Spina-Christii (L.) (Case study: Behbahan, Iran)

dry and tough conditions prevailing over Iran's ecosystems and scarcity of native and compatible species in these regions, shows the importance and value of strong and succulent plants clearer to us. Christ-thorn trees belong to one of these types of plants. Due to this importance, this research investigates site condition of the species Christ-thorn. Since the study area is a plain, sample plots were randomly selected (37 sample plots). A surface area of 64.5 hectares and circular areas of 1200 square meters were chosen. Study variables include the tree's quantitative characteristic (Diameter at breast height, Total height, Crown diameter, and Crown depth) and qualitative parameters (tree's origin, crown's form and their out-branching (ramification)) and some soil factors. Results of soil conditions in the study area showed that the sites were loam soils and electrical conductivity between 0.1-1.8 milli mouse/cm, pH is between 7.5-8 and 30 percent of the amount of lim. This forest is coppice form and all of trees bases have a symmetric crown form, and it has many out-branching state with origin of coppice trees. The average number of hectares in area is 68.5, the tree's average height in the site is 4.23m, and mean diameter breast height is equal to 14.63cm. According to the results obtained in this habitat, it can be acknowledged that the species can survive in suitable habitat conditions.