Research on the Damage Grade and Wind Resistance of Urban Common Garden Trees in South China

【Objective】The study was to explore the damage caused by wind disasters and the wind resistance of trees in urban green space and gardens.【Methods】Based on the investigation on the wind damage situation and measurement of relevant data of the urban green garden trees in Shenzhen after the typhoon Mangkhut in 2018, a wind resistance grade elevation standard of garden trees was proposed in combination with historical data, and wind resistance of 50 common garden trees was analyzed and evaluated with comprehensive evaluation method.【Result】According to the wind damage degree of garden trees and the expected recovery status, the damage status of wind disaster is divided into 5 levels, and the wind resistance performance of tree species is divided into 5 levels accordingly.The tree species with excellent branch breaking resistance are mostly the species of palm family, native offshore areas and suitable for coastal greening.Generally, the tree species of inland calm regions has weak wind resistance. The flex-resistant dried tree species are generally tough, with a straight stem and a small wind-sensitive crown. The lodging-resistant tree species are usually root system specialized or deep-rooted, with some types of crown-shaped permeability, low wind resistance or high branch flexibility.【Conclusion】The main morphological factors affecting the wind resistance of trees include trunk shape and wood material, anti-bending strength, crown layer density, crown-height ratio, root system, deflection amount, maximum static load. Among the 50 common garden tree species, palms, native tree those and species with developed root systems, tough materials and transparent canopies have strong wind resistance.