158 Frank et al.: Street Tree Population of Greater Melbourne Table 1. Details of municipalities. Council Banyule City Council Bayside City Council Boroondara City Council Brimbank City Council Cardinia Shire Council Casey City Council Darebin City Council Frankston City Council Glen Eira City Council Greater Dandenong City Council Hobsons Bay City Council Hume City Council Kingston City Council Knox City Council Manningham City Council Maribrynong City Council Maroondah City Council Melbourne City Council Melton Shire Council Monash City Council Moonee Valley City Council Moreland City Council Population 118,000 90,205 157,000 Area (km2 ) Street length (km) Number of street trees 63 613 72,000 36 420 43,678 65 648 62,000 149,131 123 801 85,000 112,062 142 618 43,544 117,000 132,000 130 560 15,522 74,164 138,424 503 887 41,713 135,251 53 620 46,105 39 460 45,000 66 489 65,000 91 540 28,003 61 469 48,985 37 308 18,592 141,200 114 204 68,690 31 302 28,500 160,862 112,307 129,677 Tree inventory Comment Part data Full data Full data No data 45,083 1,280 1,420 21,000 (est.) Part data 989 km unsealed roads 181,599 395 1,117 No data 131,000 No data Full data Full data Full data Full data Full data Full data Full data Full data 112,503 113 710 77,000 (est.) No data 150 km sealed rural and 60 km unsealed 61,145 96,000 52,000 39,109 528 659 18,000 82 707 106,859 44 500 42,000 51 492 62,000 57,241 430 865 No data 73,092 84,300 142,000 21 245 25,868 26 308 32,968 64 650 72,000 Full data Full data Full data No data Full data Full data Full data Mornington Peninsula Shire Council 120,000 720 1,890 70,000 (est.) No data Nillumbik Shire Council Port Phillip City Council Stonnington City Council Whitehorse City Council Whittlesea City Council Wyndham City Council Yarra City Council 115,352 487 653 36,000 20 345 20,243 Yarra Ranges Shire Council Totals 86,525 542 635 30,000 (est.) No data 69,400 No data Full data Full data Full data No data 115 km unsealed Full data 143,230 2,472 2289 60,000 (est.) Part data 931 km unsealed 3,376,862 8,828 21,424 1,386,270* 2 lists the 50 most common taxa and Table 3 lists the origins of those 50 taxa. Issues regarding tree identification were highlighted in this process with 146 taxa classified to genus-level only. This category contained 91,255 plants or approximately 10% of the data. “Unknown taxon” was also prominent with 5,016 plants (0.6% of population). The top 10 taxa in Table 2 include seven Australian native taxa and three exotic taxa. However, as indicated in Table 3, there is greater diversity of exotics than Australian natives. In this context, exotic refers to a tree taxon that has its origins in a country other than Australia and Australian native to a tree taxon originating from somewhere in Australia. According to Table 3, the overwhelming majority of trees in the data are broadleaf species with 92%. Conifers follow with just 8%. Table 3 also indicates the greatest diversity of taxa was in exotics, yet they only make up approximately ©2006 International Society of Arboriculture 18% of the individuals in the superset. Table 4 and Table 5 show the most common families and the major genera, re- spectively. The family Myrtaceae makes up 52% all plants and also has the greatest diversity of genera at 8%. Rosaceae is also a significant family both in terms of number of plants and genus diversity. These 12 genera represent 515,679 plants or approximately 57% of the total population surveyed. Table 6 shows the number and percentage of tree foliage type (evergreen, deciduous, etc.). This shows the importance of evergreen taxa in the Melbourne streetscape. DISCUSSION The overriding finding of this study is that Australian native tree taxa are a vital component of Melbourne’s street land- scapes. The ten most common species, as indicated in Table 2, include seven Australian and three exotic taxa. The family
July 2006
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