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Abstract

Iran has a unique geobotanical position among the Middle Eastern countries. Sosan is located in the easternmost point of Khuzestan province. This region is one of the wealthiest plant habitats, and this study aimed to determine the dependence of plants from the phytogeographic perspective on different vegetation zones. For this study, field data were obtained using 1500 sample plots in a systematic random grid. Plant life forms were determined using the Raunkiaer method, and the geographical distribution of species was determined based on the vegetation zones classified by Zohary and Takhtjan. The results of this study showed that 169 plant species belonging to 127 genera and 50 families were identified. The Fabaceae, Poaceae, and Asteraceae families were the most important in this study. The study of life forms showed that therophytes (37.29%), hemicryptophytes (32.54%), phanerophytes (17.75%), cryptophytes (7.1%), and chamaephytes (5.32%), most important life forms of the plant. Also, the geographical distribution study showed that Irano-Turanian (58.6%), Irano-Turanian, Mediterranean (11.2%), Irano-Turanian, Sahara-Sindian (7.7%), and Irano-Turanian, Euro-Siberian (7.1%) were identified as the most important chorotypes in this region. The IUCN index study showed that the most critical group in this region is the data-deficient species. In this study, the species without information (88.57%), the species at risk (7.7%), the species of least concern (2.95%), the species vulnerable (1.18%), and the species in danger (0.59%) of the species identified in this protected area

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