Analyzing spatiotemporal changes in urban green spaces' ecosystem service value and resilience
سال انتشار: 1403
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 53
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شناسه ملی سند علمی:
JR_IJHCUM-9-2_003
تاریخ نمایه سازی: 7 اسفند 1402
چکیده مقاله:
KGROUND AND OBJECTIVES: Urban ecosystem services are provided by a multitude of habitats, including green and water spaces. Such services are commonly under the control of heavy demand raised by the large number of beneficiaries. In this context, urban green spaces viz. parks and gardens supply these services for city residents. From this perspective, this study is to analyze the spatiotemporal changes in the ecosystem servicevalue of urban green spaces in Districts ۱ and ۱۴ (out of ۲۲) of Tehran Municipality, Tehran, Iran. The level of resilience (namely, capacity and adaptability) of these districts, once confronted with climate change and environmental degradation, particularly carbon sequestration, is then investigated. As an innovation, the current study ultimately assesses the ecosystem services value of urban green spaces with higher accuracy to exert more actions to improve these spaces.METHODS: This library-based documentation study utilized spatiotemporal modeling with reference to software packages and field visits. In the first step, remote sensing was applied to create land-use maps using ENVI ۵.۳ software package and its formulas, algorithms, and extensions. In the second step, the InVEST software and model were used to model carbon sequestration in selected districts. To assess carbon sequestration and its changes over time, land-cover maps were generated for three ۱۰-year periods (۲۰۰۳, ۲۰۱۳, and ۲۰۲۳) with ۳۰ m accuracy via Landsat satellite-based program. The maps were classified in ENVI ۵.۳, and the net carbon sequestration in land, along with the market size of carbon sequestration, was estimated using the InVEST model, incorporating land-use maps, land-cover types, and carbon sequestration in reservoirs. Organic carbon content was determined based on other carbon reservoirs, previous surveys, and available data. Each carbon reservoir unit was valued in dollars, and discount rates and annual changes in carbon value were calculated based on global and local conditions surveys.RESULTS: The study results obtained from land-cover/use maps produced during ۲۰۰۳, ۲۰۱۳, and ۲۰۲۳ in the selected districts, demonstrated a diminishing trend of green spaces and barren lands, while the area of built land has increased over time. The numerous changes in land use in the company of construction in green spaces and barren lands in District ۱ from ۲۰۰۳ to ۲۰۱۳ had further led to ۱۹۱۴۰۱۶۰۸ tons of emission, including ۱۷۹۱۱۴۶۶۹ tons of carbon, valued ۴۹۰۵۶۲۶۷ and ۴۶۳۶۴۲۲ million Dollars, respectively. In District ۱۴, the emission during ۲۰۰۳-۲۰۲۳ was also equal to ۱۸.۳۶۴۴ tons of carbon, and that was ۳۴۴۴.۱۴ tons of carbon for the period of ۲۰۱۳-۲۰۲۳, worth ۱۸۷۳۸۷۱ and ۱۷۴۹۷۶۹ thousand Dollars, in that order.CONCLUSION: Indiscriminate construction and development of built-up areas in Tehran have undermined green spaces and barren lands, negating the benefits of green infrastructure efforts. This has resulted in a reduction in urban green spaces, hampering their capacity for carbon absorption and sequestration. Consequently, reduced carbon deposition will contribute to higher temperatures, diminishing the resilience of these urban areas.
کلیدواژه ها:
نویسندگان
Sh. Hosseini
Department of Environmental Planning, Alborz Campus, University of Tehran, Tehran, Iran
M.J. Amiri
Department of Environmental planning, Faculty of Environment, University of Tehran, Tehran, Iran
Y. Moarrab
Department of Safty, Faculty of Passive Defence, Imam Hossein University, Tehran, Iran
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