A Comparative Evaluation of Ecosystem Services Provided by Street Trees in Seoul for the Suggestion of Social Equity

Cities must overcome their limitations on quantitative growth by pursuing sustainable development. Road-centered development leads to social problems, including inequality, during urban expansion. This study focuses on quantifying the ecosystem services provided by street trees in the Gangnam and Gangbuk Districts of Seoul, South Korea. This research utilized public data and field surveys conducted between April and August 2023, which is the best time to grow coniferous and deciduous trees. The results helped quantify the improvement in the air quality and ecological economic value from the perspective of plant species structure and carbon storage. The street trees in Gangnam stored 3691.61 t (metric tons) and sequestered 359.45 t of carbon; removed 2.28 t of air pollutants; and reduced 3977.46 m 3 of rainwater runoff annually. In contrast, the street trees in Gangbuk stored 831.61 t and sequestered 74.97 t of carbon; removed 0.4 t of air pollutants; and annually reduced rainwater runoff by 1491.74 m 3 . By quantifying the ecosystem services of street trees, this study showed a gap in the supply of ecosystem services, which are relatively poor in economically poor areas, thus contributing to a more holistic understanding of urban growth and advocating for inclusive and socially equitable development strategies and management policies in Seoul.