Improving confidence in tree species selection for challenging urban sites: a role for leaf turgor loss

• Published in: Urban ecosystems 2018-12, Vol.21 (6), p.1171-1188
• Main Authors: Sjöman, H., Hirons, A. D., Bassuk, N. L.
• Format: Article
• Language: English
• Subjects: Biodiversity; Biomedical and Life Sciences; Decision making; Drought; Drought resistance; Ecology; Ekologi; Environmental Management; Forest Science; Herbivores; Landscape Architecture; Landskapsarkitetktur; Leaves; Life Sciences; Nature Conservation; Northern Hemisphere; Pests; Plant species; Skogsvetenskap; Species diversity; Trees; Turgor; Urban areas; Urban Ecology; Urban environments; Urban forests; Water potential
• ISSN: 1083-8155; 1573-1642; 1573-1642
• DOI: 10.1007/s11252-018-0791-5

High species diversity is argued to be the most important requisite for a resilient urban forest. In spite of this, there are many cities in the northern hemisphere that have very limited species diversity within their tree population. Consequently, there is an immense risk to urban canopy cover, if these over-used species succumb to serious pests or pathogens. Recognition of this should motivate the use of less commonly used species. Analysis of plant traits, such as the leaf water potential at turgor loss (Ψ P0 ), can provide useful insights into a species’ capacity to grow in warm and dry urban environments. Therefore, the aim of this study was to evaluate Ψ P0 of 45 tree species, the majority of which are rare in urban environments. To help evaluate the potential for using Ψ P0 data to support future decision-making, a survey of professionals engaged with establishing trees in urban environments was also used to assess the relationship between the measured Ψ P0 and the perceived drought tolerance of selected species. This study demonstrates that Ψ P0 gives strong evidence for a species’ capacity to tolerate dry growing conditions and is a trait that varies substantially across species. Furthermore, Ψ P0 was shown to closely relate to the experience of professionals involved in establishing trees in urban environments, thus providing evidence of its practical significance. Use of plant traits, such as Ψ P0 , should, therefore, give those specifying trees confidence to recommend non-traditional species for challenging urban environments.