Urban Restoration Ecology: Investigating environmental change, ecological function, and enrichment planting
type: CreativeWork
description: Ecosystems worldwide are being degraded and destroyed by human actions on an unprecedented level. This continues despite growing evidence that intact, functioning ecosystems are critical to human health and well-being. The field of restoration ecology has rapidly developed as a response to ameliorate the damage by investigating how to re-build ecosystems. This branch of science generally posits that replacing lost structure, i.e. re-vegetation, will re-create ecosystems, but there is little empirical evidence supporting this assumption. In ecosystems with long development timelines, such as forests, it is unclear how dynamics change after planting and over the long-term, and hence what best management practices should be used in the decades following initial plantings. This thesis addresses these knowledge gaps through three separate studies on restored urban forests. The first study investigated whether planted trees will eventually grow into self-regenerating forests that provide suitable conditions for establishment of late-successional plant species. Further, what timeline does this occur along and what specific conditions drive native plant regeneration? To answer these questions a chronosequence of restored urban temperate rainforests aged 3 to 70 years was used in the New Zealand cities of Hamilton and New Plymouth. Various ecosystem properties were measured in the restored forests and compared with the same in remnant and unrestored forests. Structural equation modelling was used to determine which properties were significant drivers of plant regeneration and break point analysis was used to identify thresholds in ecosystem property development over time. Results indicated that unrestored forests had marginally fewer regenerating late-successional plants than remnant forests did. This indicates that restoration actions must take place in these areas to ensure regeneration densities reach natural, desirable levels. The final model indicated it is possible for…
abstract: Ecosystems worldwide are being degraded and destroyed by human actions on an unprecedented level. This continues despite growing evidence that intact, functioning ecosystems are critical to human health and well-being. The field of restoration ecology has rapidly developed as a response to ameliorate the damage by investigating how to re-build ecosystems. This branch of science generally posits that replacing lost structure, i.e. re-vegetation, will re-create ecosystems, but there is little empirical evidence supporting this assumption. In ecosystems with long development timelines, such as forests, it is unclear how dynamics change after planting and over the long-term, and hence what best management practices should be used in the decades following initial plantings. This thesis addresses these knowledge gaps through three separate studies on restored urban forests. The first study investigated whether planted trees will eventually grow into self-regenerating forests that provide suitable conditions for establishment of late-successional plant species. Further, what timeline does this occur along and what specific conditions drive native plant regeneration? To answer these questions a chronosequence of restored urban temperate rainforests aged 3 to 70 years was used in the New Zealand cities of Hamilton and New Plymouth. Various ecosystem properties were measured in the restored forests and compared with the same in remnant and unrestored forests. Structural equation modelling was used to determine which properties were significant drivers of plant regeneration and break point analysis was used to identify thresholds in ecosystem property development over time. Results indicated that unrestored forests had marginally fewer regenerating late-successional plants than remnant forests did. This indicates that restoration actions must take place in these areas to ensure regeneration densities reach natural, desirable levels. The final model indicated it is possible for…
author: Wallace, Kiri Joy
keywords: restoration targets, indicators, temperate rainforest, urban ecology, tree regeneration, structural equation modeling, epiphytes, microclimate, non-native species, introduced species, forest restoration, decomposition, denitrification, ecological function, urban restoration, ecosystem function, Tradescantia fluminensis, enrichment planting, exotic weeds, Beilschmiedia tawa
license: https://researchcommons.waikato.ac.nz/bitstreams/c89cbca5-125b-463b-ae48-645feee5ea6a/download
date published: 2017
date modified: 2026-07-24T05:57:15Z
provider: University Waikato
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: The University of Waikato