Old residential areas in Japanese suburbs have challenges in maintaining planted trees due to current residents' aging and new residents' less interest in tree maintenance. As a solution to the problem, the present study considers increasing residents' motivation for maintaining trees by demonstrating the value of trees as ecosystem services using i-Tree. The quantified value was presented to residents through the questionnaire (n=782), and their perception change in the tree was analyzed. The result shows an overall positive perception change by offering quantified ecosystem services. However, there is a difference depending on the type of perception: necessity, amount, and motivation to further maintenance. Furthermore, although the whole perception change was positive, there was a group whose perception change was negative. The group was characterized by older, retired, longer residence length, and high tree maintenance motivation. Those people may have felt that the quantified ecosystem services were not worth the effort that they made for a long time.
