Danish tree managers urged to diversify populations for resilience

Denmark's tree managers are being urged to work more strategically with their tree stock in order to reduce vulnerability to potential attacks from pests or diseases and climate change effects.

Image: La Citta Vita
Image: La Citta Vita

A study, by a University of Copenhagen professor, a tree officer and a government landscape architect, proposes that no genus should account for more than 10 per cent, and no species for more than 5 per cent, of Denmark's urban tree populations.

Based on tree inventories of 30 municipalities, the study found that 11 different genera account for 92 per cent of their total street tree stock, while 12 species account for 73 per cent of the total. Tilia was the most prevalent genus at 26 per cent, with T. × europaea (common lime) the most widespread species at 12 per cent.

Five other species (Norway maple, London plane, small-leaved lime, ash, Swedish whitebeam) each account for more than the proposed 5 pent maximum share. The study is published in Urban Forestry & Urban Greening.

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