©2023 International Society of Arboriculture 16 Arboriculture & Urban Forestry 2023. 49(1):16–37 https://doi.org/10.48044/jauf.2023.003 from seed, but progeny show seedling variability. There has been a long interest in selecting superior phenotypes and propagating vegetatively, but many eucalypts have proven problematic for vegetative prop- agation, and so the E. leucoxylon specimens grown as street trees have been propagated from seed. Melbourne, the capital city of the State of Victoria, has a long history of street tree plantings. The city (−37.814, 144.963), with a population of over 5 mil- lion people, covers an area of 10 × 103 km2, and its Köppen climate classifi cation is temperate oceanic. While temperatures can range from a low of −2.8 °C to a high of 46.4 °C, the average low and high are 11.6 °C and 20.8 °C, and average annual rainfall is 600 mm. Spencer (1986) describes 2 separate phases of amenity tree planting, with the fi rst phase from INTRODUCTION In contrast to urban tree species from genera such as Ulmus, Quercus, Platanus, and Fagus, where elite specimens for urban use have been developed over centuries, there has been little research into the selec- tion and vegetative propagation of Australian native tree species for amenity purposes (Beardsell et al. 1993; Moore 2003). Eucalypt species with the most brilliant fl ower colours are generally found in south- west and tropical Australia (Chippendale and Johnston 1983), but Eucalyptus leucoxylon F. Muell. is one of a few eucalypts occurring in south-eastern Australia with bright coloured fl owers, and it is highly regarded as an ornamental tree that fl owers readily and early (Williams and Brooker 1997; Brooker and Kleinig 2006). Eucalyptus leucoxylon is readily propagated The Potential of Yellow Gum (Eucalyptus leucoxylon F. Muell.) as an Urban Street Tree: An Assessment of Species Performance in the City of Greater Melbourne, Australia By G.M. Moore and A. Chandler Abstract. Background: In contrast to trees from northern hemisphere genera, there has been little research into the selection and vegetative propagation of Australian native tree species for use as street trees. Eucalyptus leucoxylon F. Muell. is one of a few eucalypts occurring in south-eastern Australia with bright coloured fl owers and is highly regarded as an ornamental tree that fl owers readily. It is propagated from seed, but progeny typically show seedling variability and diversity. Eucalyptus leucoxylon was identifi ed as the most widely planted eucalypt in the streets of the city of greater Melbourne, Australia. Methods: This research assessed 300 E. leucoxylon street trees growing across the city of greater Melbourne for their performance against arboricultural criteria relating to canopy structure and density, straightness of the trunk, health (assessed on canopy, trunk, and branch condition, production of exudates, and presence of fungal fruiting bodies), fl ower colour, and root systems. Results: The results showed that E. leucoxylon was a suitable street tree species with most specimens showing good habit, vigour, and health. Discussion: The trees had traits such as live crown ratio, height, fl ower colour, and capacity to cope with pruning that are considered appropriate for a street tree. Their dense canopies and high live crown ratios provide shade that can reduce the urban heat island (UHI) effect. Conclusion: This suggests the species has the potential to be a successful street tree not only in Australia, but in other parts of the world where it has been grown successfully in forestry plantations. Keywords. Arboricultural Criteria; Eucalyptus; Flower Colour; Live Crown Ratio; Street Tree Performance; Urban Forest. Moore and Chandler: The Potential of Yellow Gum as an Urban Street Tree Scientifi c Journal of the International Society of Arboriculture
January 2023
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