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<p>Structural diversity is an important urban forestry metric, used to estimate management requirements and as an indicator of urban forest age. As trees get larger, they also provide more–and different–ecosystem services than younger, smaller trees. Consequentially, structural diversity is an objective in urban forest management. While taxonomic diversity has previously been mapped, little is known about structural diversity patterns within and across municipalities. Using an urban tree inventory repository, we provide the first national-level assessment of street tree structural diversity in Canada’s urban forests. Across Canada, there is a dominance of smaller street trees, and no city was within ± 2.5% of recommended size class abundances. Median trunk diameter at breast height (DBH) does not differ significantly between ecozones or city sizes. Downtown areas often have larger trees than non-downtown areas, despite both areas being dominated by small trees. Our results highlight the need for continued protection of large mature trees.</p>

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The Structural Diversity of Canada’s Urban Forests: A National Summary and an Analysis of Street Tree Size Across Ecozones, City Sizes, and Within Cities

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Alexander J. F. Martin,
  • Lukas G. Olson,
  • Emma S. Bacon,
  • Andrew D. Almas,
  • Andrew K. Koeser,
  • Richard J. Hauer,
  • Tenley M. Conway

摘要

Structural diversity is an important urban forestry metric, used to estimate management requirements and as an indicator of urban forest age. As trees get larger, they also provide more–and different–ecosystem services than younger, smaller trees. Consequentially, structural diversity is an objective in urban forest management. While taxonomic diversity has previously been mapped, little is known about structural diversity patterns within and across municipalities. Using an urban tree inventory repository, we provide the first national-level assessment of street tree structural diversity in Canada’s urban forests. Across Canada, there is a dominance of smaller street trees, and no city was within ± 2.5% of recommended size class abundances. Median trunk diameter at breast height (DBH) does not differ significantly between ecozones or city sizes. Downtown areas often have larger trees than non-downtown areas, despite both areas being dominated by small trees. Our results highlight the need for continued protection of large mature trees.