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Study on the ecosystem services of urban forests: implications for climate change mitigation in the case of Adama City of Oromiya Regional Sate, Ethiopia

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Abstract

This study was conducted to explore the ecosystem services of urban forests in Adama city, central Ethiopia. Attempts were made to quantify the carbon storage and sequestration, air pollution removal and hydrological benefits of urban trees. The urban forest structure and composition of the city was surveyed and analyzed. The i-Tree Eco Model was employed to analyze the ecosystem services based on the current urban forests structure of the city. The result revealed that the urban trees of the Adama city stored a total of 116,000 tons of carbon. The tree species identified with higher CO2 sequestration per year were Melia azedarach (15%), Eucalyptusglobulus (8%), Carica papaya (7%), and Delonix regia (6%). In addition, 22%, 12%, 10% and 4% of carbon were stored by Eucalyptus globulus, Melia azedarach, Carica papaya and Delonix regia tree species respectively. Moreover, trees and shrubs species in the city removed about 188 thousand tons of air pollutants caused by O3, CO, NO2, PM2.5 and SO2 per year. In Adama, 35% of the urban trees’ volatile organic compaound emissions were from Eucalyptus cinerea and Eucalyptus globulus. The monetary value of Adama urban forest in terms of carbon storage, carbon sequestration, and pollution removal was estimated to 43,781, 3,121 yr−1 and 320,915,596 USD yr−1, respectively. It was concluded that significant quantity of CO2 and air pollutants were found being removed by the exotic tree and shrub species. However, every plant species found in the city does not mean ecologically important due their VOC emitting nature. Thus, the results of the study are valuable in increasing the awareness of the decision making bodies, the public and any stakeholders of the eco-benefits of urban trees in the mitigation of climate changes.

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Availability of data and materials

The data set generated for the study area is available from the corresponding author on reasonable request.

Abbreviations

SE:

Standard Error

USD:

US Dollar

yr:

Year

VOC:

Volatile Organic Carbon

kg:

Kilogram

CO2 :

Carbon dioxide

m2 :

Meter squer

DBH:

Diameter at Breast Height

SO2 :

Sulfur dioxide

O3 :

Ozone

CO:

Carbon mono oxide

NO2 :

Nitrogen dioxide

PM2.5 :

Particulate Matter less than 2.5 microns

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Acknowledgements

The authors acknowledge the experts of Adama city urban greening and beautification department (Mr. Abu Regasa, Mr. Adugna Muleta, Mr. Girma Godana, and Mr. Yadesa Kacha) for their assistance in facilitating the fieldwork. Also the authors are grateful to Dr. Mesfin Asefa a Mayor of Adama city administration and as well as Wuhan University of Technology, China for financial and other necessary support during our study.

Funding

This work was supported by the Adama city administration [$1500]; Wuhan University of Technology [$1000] are greatly acknowledged.

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Contributions

Mr. Hingabu Hordofa: Contributed in designing the research idea, data collection, report writing and data analysis and guiding the overall paper work. Mr. Ararsa Derese: Participated in data analysis, interpretation and report writing. Dr. Fekadu Fufa: Participated in designing method and structuring report. Mr. Tikabo Gebreyesus: Participated in edited language. Professor Shaoxian Song: Participated in designing method, structuring report and guiding the overall paper work.

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Correspondence to Hingabu Hordofa Koricho.

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Koricho, H.H., Seboka, A.D., Fufa, F. et al. Study on the ecosystem services of urban forests: implications for climate change mitigation in the case of Adama City of Oromiya Regional Sate, Ethiopia. Urban Ecosyst 25, 575–584 (2022). https://doi.org/10.1007/s11252-021-01152-0

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