Estimation of monetary value of street trees by i-Tree Eco using tree health surveys in Suita City, Osaka Prefecture

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  • 大阪府吹田市の樹木健全度調査を用いたi-Tree Ecoによる街路樹の貨幣価値推定

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<p>Street trees in Japan are beginning to be renewed in the face of various problems caused by the enlarged diameter of trees as well as aged trees. In order to promote the renewal without attenuating the value of the current street trees, it is necessary to construct a method that improves the accuracy of tree assessment by employing data easily obtained in Japan and parameters optimized for Japan. In this study, we analyzed the tree structure and estimated tree compensation values based on the tree soundness research data for the street trees in Suita City, Osaka Prefecture. In addition, we quantified and monetized the ecosystem services provided by the street trees by estimating 1) carbon storage, 2) carbon sequestration, 3) air pollutant removal, 4) health incidence and medical cost reductions, and 5) rainwater runoff reduction. As a result, the total number of trees analyzed throughout the city turned to be 8,796, comprised of 100 species. For reference purposes, the estimates are: compensation values of about 770.52 million yen,1) 1,377 tons, about 28.47 million yen,2) 90.0 tons, about 1.86 million yen/year,3) 961.1 kg/year,4)26.5 cases/year, about 11.58 million yen/year, and5) 8917.7 m3/year, about 6.41 million yen/year.</p>

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