Urban greenspaces’ structure and function can promote human health and environmental quality and also decrease some challenges that have been increased due to urbanization. So,it is important to do some studies to investigate the urban trees’ diversity and structurebecause it can not only raise environmental awareness but also help policymakers for better management to achieve the desiredenvironment. According to our knowledge,there has been done no investigation on the diversity of the urban treesof Tehran. Thepresent study aims to assess the current structure and diversity of treesin Tehrangreen spaces(as a case study),using the i-Tree Eco model. Data from 316 field plots were collected during the growing season. It must be noted that the primarynumber ofplots was 330, but some of them were notaccessible. The plots were selected based ona randomizedclustersamplingmethodand analyzed using the i-Tree Eco model. Theresults indicatethat the overall tree density in Tehran isabout 97trees/ haand the number of trees isabout7,127,933. The most common tree species are Afghan pine (13.0 percent), Black locust (10.0 percent) and, Arizona cypress (9.4 percent). In Tehran, about 28 percent of the trees are Asian endemic species and most trees haveAmerican origin (26 percent of the trees). Tehran urban trees are composed of endemic and exotic tree species. Therefore, Tehran'surban forest often has a diversity that is higher than the surrounding native landscape. Thus, the paper illustrates a methodology toassessthe current structureand trees’ diversityof urban forests, which helps thedevelopment of future urban tree planting strategies and quantitative assessment
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