“…Urban forests, or sectors of the urban forest, become more vulnerable if they are comprised of only a few dominant species, as a significant climatic event, pest or pathogen outbreak may make it necessary to remove a high percentage of the trees. However, tree inventories from across the world demonstrate that poor trees species diversity is widespread in urban forests (Breuste, 2012; Bühler et al., 2007; Cowett & Bassuk, 2017, 2020; Pauleit et al., 2002; Roloff et al., 2009; Sæbø et al., 2005; Sjöman & Östberg, 2019; Thomsen et al., 2016; Yan & Yang, 2017). Therefore, limited genotypic diversity in urban tree populations is a prevailing international issue and strategic diversification is critical for building resilience into the urban forest and its associated green infrastructure.…”