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Research papers, Lincoln University

A city’s planted trees, the great majority of which are in private gardens, play a fundamental role in shaping a city’s wild ecology, ecosystem functioning, and ecosystem services. However, studying tree diversity across a city’s many thousands of separate private gardens is logistically challenging. After the disastrous 2010–2011 earthquakes in Christchurch, New Zealand, over 7,000 homes were abandoned and a botanical survey of these gardens was contracted by the Government’s Canterbury Earthquake Recovery Authority (CERA) prior to buildings being demolished. This unprecedented access to private gardens across the 443.9 hectares ‘Residential Red Zone’ area of eastern Christchurch is a unique opportunity to explore the composition of trees in private gardens across a large area of a New Zealand city. We analysed these survey data to describe the effects of housing age, socio-economics, human population density, and general soil quality, on tree abundance, species richness, and the proportion of indigenous and exotic species. We found that while most of the tree species were exotic, about half of the individual trees were local native species. There is an increasing realisation of the native tree species values among Christchurch citizens and gardens in more recent areas of housing had a higher proportion of smaller/younger native trees. However, the same sites had proportionately more exotic trees, by species and individuals, amongst their larger planted trees than older areas of housing. The majority of the species, and individuals, of the larger (≥10 cm DBH) trees planted in gardens still tend to be exotic species. In newer suburbs, gardens in wealthy areas had more native trees than gardens from poorer areas, while in older suburbs, poorer areas had more native big trees than wealthy areas. In combination, these describe, in detail unparalleled for at least in New Zealand, how the tree infrastructure of the city varies in space and time. This lays the groundwork for better understanding of how wildlife distribution and abundance, wild plant regeneration, and ecosystem services, are affected by the city’s trees.

Images, UC QuakeStudies

A photograph of a tower of the Arts Centre taken from Rolleston Avenue near the Botanic Gardens. A wooden structure has been wrapped around the tower and secured with tie-downs in order to help reduce damage by further aftershocks.

Images, UC QuakeStudies

A digital copy of a painting by Hamish Allan. The painting is titled, 'Garden City II, Ticketyboo' and was painted in 2013. The original painting is acrylic on linen and measures 400mm in diameter.

Images, UC QuakeStudies

A photograph of the partially-completed Green Room garden on Colombo Street. Crack'd for Christchurch's armchair and mosaic artworks are on a platform in the back. The armchair and ottoman have been wrapped in tarpaulins until their unveiling. Wire fences have been placed around the section as a cordon.Crack'd for Christchurch comments, "Flora and Otto waiting for their big day, with the garden still to be finished."

Images, UC QuakeStudies

A photograph of the Arts Centre taken from Rolleston Avenue near the Botanic Gardens. The building has been cordoned off by wire fencing and a wooden structure has been secured to the tower with tie-downs to help reduce damage from further aftershocks.

Images, UC QuakeStudies

Personnel from Singapore's Air Force standing alongside members of the New Zealand Defence Force in the Christchurch Botanical Gardens. The personnel were laying a wreath in memory of those who lost their lives in the Christchurch Earthquake.

Images, UC QuakeStudies

A digital copy of a painting by Hamish Allan. The painting is titled, 'Garden City III, Tunnel control' and was painted in 2013. The original painting is acrylic on linen and measures 400 by 400mm.

Images, UC QuakeStudies

An image from a Army News March 2011 article titled, "Territorial Force". The image shows members of the Auckland and Northland Territorial Units clearing silt from a resident's garden in east Christchurch. The resident is out in the garden helping out.