In today's society, we increasingly recognise the importance of the ecosystem services that trees provide in cities. However, valuing these services is often challenging, especially when it comes to the economic valuation of trees and their functions. In this paper, we focus on the economic valuation of ecosystem services provided by trees in the Maribor City Park. In the eastern part of the park, 306 trees were inventoried, for which we determined the tree species, measured diameter, height, location, assessed health status, canopy condition and potential damage. Data on 305 of the 306 trees were entered into the i-Tree Eco software to obtain values on the structure of each tree (leaf area, canopy size, basal area) and calculations of their ecosystem services (carbon sequestration and storage, air purification, oxygen production, prevented stormwater runoff, impact on the cost of nearby buildings, and the cost of replacing the tree). The most common tree species was the horse chestnut (Aesculus hippocastanum L.), followed by the metasequoia (Metasequoia glyptostroboides Hu and Cheng) and the hornbeam (Carpinus betulus L.).Two thirds of the trees in the park are non-native species. In general, the trees are in good health. Damage was most frequent in the root system, with a high proportion of mechanical damage. The analysis concluded that the trees in the inventoried part of the park sequester 318 tonnes of carbon, which has a monetary value of 9,800 €. Annually sequester 5 tonnes of carbon, representing 157 €, clean 129.8 g of pollutants, representing 259 €, reduce surface runoff of rainwater by 143 m3, representing 75 €, and reduce heating costs, which were estimated at 265 €. The total value of replacing the trees, not including their ecosystem services, amounts to 1.47 million €. The total value of the ecosystem services is approximately 10,680 €. The total ecosystem services value of the trees in city park Maribor shows that trees contribute significantly to the ecological and economic value of the park, which underlines the need for their conservation and careful management.
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