Stand characteristics and dead wood in urban forests : Potential biodiversity hotspots in managed boreal landscapes

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http://hdl.handle.net/10138/318154

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Korhonen , A , Siitonen , J , Kotze , J , Immonen , A & Hamberg , L 2020 , ' Stand characteristics and dead wood in urban forests : Potential biodiversity hotspots in managed boreal landscapes ' , Landscape and Urban Planning , vol. 201 , 103855 . https://doi.org/10.1016/j.landurbplan.2020.103855

Title: Stand characteristics and dead wood in urban forests : Potential biodiversity hotspots in managed boreal landscapes
Author: Korhonen, Aku; Siitonen, Juha; Kotze, Johan; Immonen, Auli; Hamberg, Leena
Contributor: University of Helsinki, Natural Resources Institute Finland (LUKE)
University of Helsinki, Ecosystems and Environment Research Programme
Date: 2020-09
Language: eng
Number of pages: 12
Belongs to series: Landscape and Urban Planning
ISSN: 0169-2046
URI: http://hdl.handle.net/10138/318154
Abstract: Urban forests are usually not intensively managed and may provide suitable environments for species threatened by production forestry. Thus, urban forests could have the potential of enhancing biodiversity both within cities and at a larger landscape scale. In this study, we investigated stand structures of boreal urban forests to assess them in terms of naturalness and biodiversity conservation potential. We sampled two types of urban spruce-dominated stands: random urban stands as representatives of average urban forests, and valuable urban stands known to host high polypore richness and assumed to represent urban biodiversity hotspots. Urban forests were compared to rural forests with different levels of naturalness. Living and dead trees and cut stumps were measured from all studied stands. Urban forests had generally diverse living tree structures with abundant large-diameter trees. Random urban forests had more dead wood (median 10.1 m(3) ha(-1)) than production forests (2.7 m(3) ha(-1)) but still considerably less than protected, former production forests (53.9 m(3) ha(-1)) or semi-natural forests (115.6 m(3) ha(-1)). On the other hand, valuable urban forests had relatively high median volume of dead wood (88.2 m(3) ha(-1)). We conclude that the combination of diverse stand composition and the presence of old-growth characteristics in boreal urban forests form a strong baseline from which their biodiversity value can be further developed, e.g. by leaving more fallen or cut trees to form dead wood. We propose that urban forests could become significant habitats for biodiversity conservation in the future.
Subject: DEPOSITION
DIVERSITY
FINLAND
KEY HABITATS
PUBLIC PREFERENCES
REGENERATION
SOUTHERN
TREES
UNDERSTOREY VEGETATION
VISUAL PREFERENCES
1172 Environmental sciences
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