مدیریت هزینه فضای سبز شهری (مطالعه موردی: شهر تهران)

Urban green space is one of the most important components in city management and cities’ development given its social and environmental functions and financial and economic aspects. Different species of plants including trees, shrubs, cover crops and flowers or seasonal plants have specific features in terms of climate-compatible of Tehran and water demand. They also have different roles in meeting expected functions of urban green space, particularly prettification and reducing air pollution by producing oxygen. Thus, this paper tries to study selection criteria, assess plant species, and determine appropriate criterion for Tehran green space. Then, it determines relative weight of each one by surveying 35 experts’ view in the form of group analytical hierarchy process (GAHP) method. The obtained weights are instruments for valuation of 60 Tehran’s main plant species done by simple valuation (linear) and TOPSIS methods.  The results indicated that evergreen oak, elm, and silver cypress are the most valuable species. Ranking of plant species were obtained by two mentioned methods in each of four groups that they were almost matched with each other. Using these ranks has increased at least 33 percent of productivity cost of urban green space in replanting project of municipality districts as well as increasing citizens’ satisfaction and life of plant species that is in line with resistance economy.