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Mapping the diversity of street tree inventories across eight cities internationally using open data

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Publication Information

YearPublished:
Date of Publication: 06/01/2021
Journal:
Journal Name: Urban Forestry & Urban Greening
Journal Volume: Volume 61
Is this peer reviewed?:

    Table of Contents

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    Highlights

    • Examined the diversity of species, genera, and family for street trees in eight cities internationally.
    • Investigated how street tree species variation differed inside and outside of cities’ centers.
    • Amsterdam (NL) was the only city investigated to meet one of the diversity benchmarks.
    • Diversity indices show greater diversity outside of the city center, especially at the species-level.
    • Used only open-source data and software to stimulate further analysis of additional cities.

    Abstract

    Tree diversity, on a species-, genus-, and family-level, is an important factor in securing healthy urban forests and providing ecosystem services for billions of city dwellers. Using open-source data on global tree inventories, this study examines (1) the diversity of species, genera, and family of urban street trees in eight cities internationally; (2) how they score on diversity benchmarks and indices; and (3) the diversity variation inside and outside of cities’ centers. We hypothesized most cities would score poorly on diversity benchmarks and spatial patterns in species composition would exist, as illustrated by established relationships between urban density and urban tree diversity. Results indicate city centers were less likely to approach the proposed diversity benchmarks than outside the city center. Overall, both Shannon and Simpson diversity indices show greater diversity outside of the city center, especially at the species-level. Understanding street tree diversity and spatial variation patterns across cities internationally can offer needed evidence to back up heuristic benchmarks. The methodology and open-source data used in this study are intended to enable practitioners better target tree diversity efforts.

    Further Details

    Article References

    References

    1. Diversitree is available at http://senseable.mit.edu/diversitree.
    2. Data was sourced from Amsterdam – City of Amsterdam (2021); Bologna – Comune Di Bologna Alberi (2017); Buenos Aires – Arbolado público lineal (2020); Cambridge – City of Cambridge Trees (2020a), 2020b; Melbourne – City of Melbourne Trees (2020); Oslo – Bymiljøetaten Open Data (2020); Paris – Paris Open Data Les arbres (2020); Vancouver – City of Vancouver Street trees (2020a), 2020b.
    3. See https://www.catalogueoflife.org/ for more information on the Catalog of Life database.
    4. Diversitree is available at http://senseable.mit.edu/diversitree.
    5. The GitHub repo for Diversitree is available at https://github.com/DiversiTree/TreeDiversity.
    6. See https://www.hugsi.green/ranking/?All for more information on the Husqvarna Urban Green Space Index (HUGSI).

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