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Diversity and distribution of the urban tree population in ten major Nordic cities

Sjöman, Henrik and Östberg, Johan and Bühler, Oliver (2012). Diversity and distribution of the urban tree population in ten major Nordic cities. Urban forestry & urban greening. 2012:11 :1 , 31-39
[Research article]

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Official URL: http://dx.doi.org/10.1016/j.ufug.2011.09.004


In order to have a healthy and sustainable urban tree population, a high diversity of species and genera is needed. This study examined (1) the diversity and distribution of genera and species of urban trees in the Nordic region; (2) the diversity in different sites of the city, distinguishing between street and park environments; and (3) the presence of native versus non-native tree species in urban environments in the Nordic region. The analysis of tree diversity was based on urban tree databases comprising a total of 190 682 trees in 10 Nordic cities – Aarhus and Copenhagen in Denmark; Espoo, Helsinki, Tampere and Turku in Finland; Gothenburg, Malmo and Stockholm in Sweden; and Oslo in Norway. The tree databases for Copenhagen, Espoo, Helsinki, Stockholm and Tampere only record street trees, while the remaining databases also include park trees. Tilia was the most dominant genus in Arhus, Copenhagen, Espoo, Gothenburg, Helsinki, Oslo and Stockholm, while Sorbus was the most dominant in Malmo and Betula in Tampere and Turku. Tilia × europaea was the most common species, comprising 16.0% of the total number of tree species. There was a higher proportion of species in parks than in street environments. The number of non-native species was higher than the number of native species in both street and park environments. However, the number of individuals belonging to native species was higher than the number of non-native individuals in all cities and environments except park environments in Arhus. The concluding recommendation from this study regarding greater diversity of genera and species is to exploit local experiences of rare species from local urban tree databases. After appropriate evaluation, urban tree planners can evaluate these rare species in larger numbers for e.g. street environments, where the need is greatest.

Authors/Creators:Sjöman, Henrik and Östberg, Johan and Bühler, Oliver
Title:Diversity and distribution of the urban tree population in ten major Nordic cities
Series Name/Journal:Urban forestry & urban greening
Year of publishing :2012
Page range:31-39
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Landscape planning
Keywords:Invasive species, Native species, Non-native species, Park trees, Species diversity, Street trees
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Additional ID:
Type of IDID
ID Code:8943
Department:(LTJ, LTV) > Landscape Management, Design, and Construction (until 121231)
Deposited By: Johan Östberg
Deposited On:25 Jun 2012 08:33
Metadata Last Modified:02 Dec 2014 10:51

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