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A multi-scale exploration into the spatial patterns of a three dimensional Urban Tree Infrastructure (UTI) : integrating landscape connectivity, network resilience, and social deprivation

Bishop, OJ 2015, A multi-scale exploration into the spatial patterns of a three dimensional Urban Tree Infrastructure (UTI) : integrating landscape connectivity, network resilience, and social deprivation , PhD thesis, University of Salford.

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Abstract

A functionally connected urban tree infrastructure (UTI) contributes to ecosystem function, resilience, and the provision of Ecosystem Services (ES). Variation in tree height is an important attribute influencing movement of passerines, habitat quality and landscape patterns. UTI provided ES are particularly beneficial in the most deprived areas of a city. Presented in this thesis is an exploration into the social-ecological shape of a UTI using a holistic, multi-scale and dimensional, landscape approach. The potential landscape connectivity of a UTI in the City of Salford, UK was quantified and compared using the integral index of connectivity (IIC) across vertically stratified canopies existing in 2005, 2009, and 2013. System resilience was assessed through landscape graph network analysis and by the identification of canopies critical in maintaining connectivity (dIIC). The index of multiple deprivation (IMD) was related to UTI landscape composition and configuration through a series of statistical tests. The connectivity of Salford’s vertically stratified UTI was low (IIC = <0.000001 – 0.0045), besides this the temporal change in connectivity was complex with no discernible overall pattern. The rate of connectivity increase decreased after a 90-120m gap-crossing threshold. The resilience of Salford’s UTI relies on the connectivity of canopies within 4 to 5 sub-connected regions, depending on passerine perception, increasing to 10 -16 smaller regions for canopies above 17.1m. The resilience and stability of these sub-connected regions were often reliant on a central canopy patch. UTI composition is related negatively with deprivation, UTI configuration is related positively, while structural diversity of canopy heights revealed no correlation with deprivation. The research in this thesis contributes to the debates on how to best manage the UTI for both people and nature. The findings of this thesis have a number of important implications for future urban landscape management, especially as previously unknown landscape patterns have been identified.

Item Type: Thesis (PhD)
Uncontrolled Keywords: urban trees, landscape connectivity, vertical structure, passerines, urban birds, networks, landscape graphs, resilience, deprivation, urban tree infrastructure, three dimensional, threshold
Themes: Built and Human Environment
Health and Wellbeing
Subjects outside of the University Themes
Schools: Schools > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
Funders: Non funded research
Depositing User: OJ Bishop
Date Deposited: 09 Nov 2015 14:51
Last Modified: 09 Nov 2015 14:51
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