“…Researchers have studied heritage trees in various aspects, such as species and diversity (Capotorti, Del Vico, Anzellotti, & Celesti-Grapow, 2017;Nero, Kwapong, Jatta, & Fatunbi, 2018), individuals of heritage trees and their distribution in Hong Kong and Shenzhen City (Lai, Jim, Tang, Hong, & Zhang, 2019;Liu, Wang, Chen, Yi, Zeng, & Xing, 2008), age structure (Xu, Guan, Zhang, Li, Zhao, Ross, & Shen, 2021), health condition and functional diversity (Czortek & Pielech, 2020;Townsend & Barton, 2018), monetary environmental value, protecting status and challenges (Childers, Cadenasso, Grove, Marshall, McGrath, & Pickett, 2015;Zhong, Li, & Wang, 2014), habitat improvement (Ou, Zhong, & Li, 2007;Mckinney, 2006), pest prevention, tree trunk consolidation and rejuvenation, and methods of indexing tree-related data since the 1990s (Bertheau, Brockerhoff, Roux-Morabito, Lieutier, & Jactel, 2010;Zhang, Wang, Liu, Zheng, Cao, & Liu, 2019;Zhang, Cui, Liu, Zhang, Xi, Li, & Lu, 2017)…”