Justin Morgenroth

Justin Morgenroth
University of Canterbury | UC · School of Forestry

PhD

About

97
Publications
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Publications

Publications (97)
Article
Full-text available
The first International Conference on Urban Tree Diversity held during June 2014 in Alnarp, Sweden highlighted the need for a better understanding of the current state of urban tree diversity. Here we present and discuss a selection of urban tree diversity themes with the intention of developing and sharing knowledge in a research area that is gain...
Article
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Earthquake-induced liquefaction poses significant risks to the urban environment and infrastructure lifelines. Following significant liquefaction, surface ejecta can impact facilities, impede transportation systems and complicate emergency response. Few studies have applied remote sensing technologies to map the spatial extent of liquefaction eject...
Article
Accurate and up-to-date land cover maps inform and support effective management and policy decisions. Describing phenological changes in spectral response using time-series data may help to distinguish vegetation types, thereby allowing for more specificity within vegetation classification. In this research, we test this by classifying indigenous f...
Article
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The use of structure-from-motion (SfM) photogrammetry from unmanned aerial vehicles (UAVs) is becoming an increasingly popular means of characterising key forestry biophysical variables such as tree height. Despite the wide array of software that is available to process 3D point clouds from SfM, little research has investigated how the precision of...
Article
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Background: Individual-tree taper and volume equations are essential for forest management. They provide estimates of volume that are incorporated into plot-level volume equations and also into growth and yield models to estimate volumes per hectare in forest crops. Moreover, taper equations allow forest managers to estimate dimensions of logs that...
Article
Nurseries play an important role providing trees for a variety of managed environments including urban forests. The diversity of urban forests and forest restoration projects are influenced by nursery species availability, and as such, there is a need to better understand tree species diversity at nurseries. We collected tree species lists from 75...
Article
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Understanding the composition and the changes of New Zealand’s woody vegetation communities is important for effective management. However, past national-scale mapped classifications emphasised mature rather than seral vegetation communities and forests were mapped in relative coarse spatial resolution. The integration of Sentinel-2 and PlanetScope...
Article
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Taper functions are important tools for forest description, modelling, assessment, and management. A large number of studies have been conducted to develop and improve taper functions ; however, few review studies have been dedicated to addressing their development and parameters. This review summarises the development of taper functions by conside...
Article
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Juvenile plantation forest dynamics are complex but understanding and predicting early growth and survival enables effective management. Information provided by traditional growth and yield models is an essential input in decision-making processes for managing planted forests. They are generally fitted using permanent sample plot data, thus they ar...
Article
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Precise spatial information on soil properties in plantation forests is needed to improve soil nutrient management and to sustain productivity. Soil nitrogen, phosphorus, potassium, organic matter, carbon and boron are important determinants and indicators of soil fertility and quality. Particularly in forests, these soil properties are highly vari...
Article
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Background: Geospatial technologies have developed rapidly in recent decades and can provide detailed, accurate data to support forest management. Knowledge of the uptake of geospatial technologies, as well as barriers to adoption, in New Zealand’s plantation forest management sector is limited and would be beneficial to the industry. This study pr...
Article
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Background: Understanding the relationship between sites and the plant species they support is essential for effective vegetation management. Site-species matching requires knowledge of the growth response of a given species to the full range of environmental conditions in potential planting sites. This can be achieved by repeatedly measuring speci...
Article
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Background: New Zealand’s plantation forest industry is dominated by the exotic species radiata pine (Pinus radiataD.Don), which comprises approximately 90% of the net stocked area. However, there is interest in introducing new species to: (a) provide wood that is naturally decay-resistant as a substitute for wood treated with preservatives; (b) ma...
Article
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Background and Objectives: The structural diversity of an urban forest affects ecosystem service provision, and can inform management, planning, as well as policy. Trunk diameter at breast height (DBH) is amongst the most common measures of tree structure due to its ease of measurement and strong relationships with other structural and non-structur...
Article
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Background: New Zealand does not have a national forest inventory based on ground measurements. The National Exotic Forest Description (NEFD) is based on surveys of forest owners but lacks reliability in describing area and yield for small-scale forests, given that over half of the small-scale forests were not included in the direct NEFD survey. Th...
Article
As a global phenomenon, redevelopment in cities influences urban forest dynamics. This study explores the relationship between resident attitudes and tree removal, retention, and planting on redeveloped versus non-redeveloped private properties in Christchurch, New Zealand. Residents were surveyed via questionnaire between October 2016 and January...
Article
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The effect of microsite on juvenile forest plantation yield is rarely explored. This is because juvenile plantation growth is considered to be reasonably homogenous due to a lack of resource competition between trees prior to canopy closure. However, models of juvenile plantation height growth and survival that are sensitive to microsite variation...
Article
Conflicts between trees and infrastructure installation or repair occur frequently in the urban environment and may result in damage to or complete removal of tree roots. We monitored the responses of trees to linear root cutting and examined the effects of the presence of a road within tree root zones. Mature Quercus virginiana Mill. trees (n=31)...
Article
The development and proliferation of unmanned aerial vehicles (UAV) in recent years presents a new data collection opportunity for invasive alien plant (IAP) research. The flexibility and cost‐efficiency of these craft offers a valuable solution where high‐spatial or high‐temporal resolution remotely sensed data is required. In this paper we review...
Article
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Exotic conifers can provide significant ecosystem services, but in some environments, they have become invasive and threaten indigenous ecosystems. In New Zealand, this phenomenon is of considerable concern as the area occupied by invasive exotic trees is large and increasing rapidly. Remote sensing methods offer a potential means of identifying an...
Article
Land cover change (LCC) has significant effects on the global ecosystem diversity and function. This topic has received increasing attention due, in part, to its relationship with climate change, and the availability of remotely-sensed imagery that is used to monitor LCC. However, studies analysing the factors that drive LCC at large spatial scales...
Article
Land cover dynamics in the tropical dry environments of sub-Saharan Africa are not well understood compared to humid environments, especially on a national scale. Previous studies describing land cover in the dry tropics are spatially or temporally constrained. This study presents the first long-term (1972–2016) nationwide land cover dynamics and f...
Article
Tree value is sometimes appraised to account for losses linked to insurance claims or legal disputes. In many of the appraisal methods used, tree value is influenced by vitality, size, and lifespan. These three factors can all be negatively impacted by nearby construction activities – ultimately impacting the monetary value of urban trees and the g...
Article
Urban redevelopment influences urban forests, with consequences for ecosystem service provision. Better understanding the effect of redevelopment on trees in cities can improve management and inform policy, thus having positive effects on ecosystem service provision and human wellbeing. This study quantified the effect of residential property redev...
Article
The application of Landsat satellite imagery in land cover classification is affected by atmospheric and topo-graphic errors, which have led to the development of different correction methods. In this study, moderate resolution atmospheric transmission (MODTRAN) and dark object subtraction (DOS) atmospheric corrections, and cosine topographic corre...
Article
In New Zealand, 30% of plantation forests are small-scale (< 1000 ha) and knowledge of these forests, especially those less than 100 ha, is limited. These forests are expected to comprise more than 40% of the total harvest volume by 2020, so it is critical to understand the small-scale forest resource in order to plan effectively for marketing, har...
Article
Trees in the urban environment are affected by anthropogenic activities that have the potential to negatively affect tree function, health, and growth. The provision and maintenance of new underground utilities, footpaths, and street furniture all have the potential to result in conflicts with tree root systems leading to root severance. Traditiona...
Presentation
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The purpose of this Special Issue is to bring together stateof-the-art LiDAR applications for both forest inventory and management in forest ecosystems. Review papers and research contributions are suitable. In particular, contributions covering the following sub-topics are welcome: i) Individual tree segmentation and crown attribute estimation us...
Article
Accurately estimating sapwood area is essential for modelling whole-tree or stand-scale transpiration from point-flow sap-flux observations. In this study, we tested the validity of electrical resistance tomography (ERT) to locate the sapwood-heartwood (SW/HW) interface for two ring porous (Quercus nigra L. and Quercus virginiana Mill.) and one dif...
Article
A suite of best management practice documents (BMPs) providing procedures to protect trees are available around the world. An underpinning component of these texts is the provision of a tree protection zone (TPZ), the purpose of which is to define an area of ground surrounding the tree to be excluded from development activities. TPZs 12 times the t...
Method
Full-text available
Accurately estimating sapwood area is essential for modelling whole-tree or stand-scale transpiration from point-flow sap-flux observations. In this study, we tested the validity of electrical resistance tomography (ERT) to locate the sapwood-heartwood (SW/HW) interface for two ring-porous (Quercus nigra L. and Q. virginiana Mill.) and one diffuse-...
Article
The effects of urbanization on the urban forest canopy cover has received significant consideration at broad scales, but little research has explored redevelopment-related influences on individual tree removal at a property scale. This study explores the effect of residential property redevelopment on individual trees in Christchurch, New Zealand....
Article
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It is common to generate digital elevation models (DEMs) from aerial laser scanning (ALS) data. However, cost and lack of knowledge may preclude its use. In contrast, global navigation satellite systems (GNSS) are seldom used to collect and generate DEMs. These receivers have the potential to be considered as data sources for DEM interpolation, as...
Article
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In New Zealand, approximately 70% of plantation forests are large-scale (over 1000 ha) with accurate resource description. In contrast, the remaining 30% of plantation forests are small-scale (less than 1000 ha). It is forecasted that these small-scale forests will supply nearly 40% of the national wood production in the next decade. However, in-de...
Article
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Background Hybrid eco-physiological/mensurational models of forest production generally require monthly meteorological estimates at local points in the landscape as inputs. Where to obtain these estimates and how best to localise them are important questions for modellers. Data collected from nine independent meteorological stations were compared w...
Article
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Land cover classification of Landsat images is one of the most important applications developed from Earth observation satellites. The last four decades were marked by different developments in land cover classification methods of Landsat images. This paper reviews the developments in land cover classification methods for Landsat images from the 19...
Research
The objective of this study is to investigate the use of electrical resistance tomography as a tool to monitor the spread of decay in wood, by temporally normalising electrical resistivity profiles.
Article
Discrete airborne laser scanning (ALS) data has emerged as a useful tool for mapping forest leaf area index (LAI). Both empirical and physically-based approaches linking pulse penetration to LAI through gap probability theory have been widely used. We contrasted these approaches using field measurements of LAI (n = 135) acquired in stands of pure P...
Presentation
Traditionally local variation in plantation forests has been treated homogeneously. Large scale variations are commonly included in growth and yield models, but variation due to microsite factors plays a vital role, particularly in juvenile crops. In this study, we explored micro-site factors and accommodated them in height yield modeling of two du...
Article
Numerous progress has been made in the field of applied photogrammetry in the last decade, including the usage of close-range photogrammetry as a mean of conservation and record of outcrops. In the present contribution, we use the SfM-MVS method combined with a wavelet decomposition analysis of the surface, in order to relate it to morphological an...
Research
Despite the far reaching similarities between a range of best practice documents relating to tree protection zones, the theory has not been empirically tested. The objectives of this study, were to test the suitability of tree protection zones by monitoring the responses of mature trees to different root removal treatments over the course of a grow...
Research
This study simulates the types of trenching in the root zones of mature trees typically found during development activities. Physiology and growth responses were monitored periodically throughout the growing season. Additionally, we build further on our previous work and investigate the suitability of allometric relationships between trunk and root...
Article
Though relationships between urbanization and tree cover are generally well studied, the effect of redevelopment on urban trees, at the scale of the individual property, is not well understood. Developing knowledge in this area is important in order to limit tree loss during redevelopment and thus, ensure sustained ecosystem services. Here, we expl...
Research
The objective of this research is to test the suitability of allometric modelling as a means to quantify root pruning treatments, by monitoring tree responses (growth and physiology) to root severance over the course of a growing season.
Article
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Urban and peri-urban forests provide a variety of ecosystem service benefits for urban society. Recognising and understanding the many human–tree interactions that urban forests provide may be more complex but probably just as important to our urbanised society. This paper introduces four themes that link the studies from across the globe presented...
Research
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Policy brief summarizing the benefits of diverse tree populations and the actions required to achieve high urban tree diversity
Conference Paper
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Introduction Methods to characterise trees from remotely sensed data could be used to quantify the genetic, site and silvicultural drivers of tree growth. Such knowledge could then be integrated into models and decision support tools for use in forest management to grow trees fit for purpose [1]. Objectives To determine to utility of crown metrics...
Article
Introduced tree species represent a substantial component of urban forests in cities all over the world. Yet there is controversy about the further use of introduced tree species. Many practice orientated publications,research papers and governmental websites in the fields of urban planning, urban forestry, and urban ecology argue for planting nati...
Article
Leaf area index (LAI) is a forest canopy variable that is closely related to forest growth and health. The LAI-2000 Plant Canopy Analyzer is widely used for indirect measurement of LAI; however, use of the instrument is limited to diffuse sky conditions, greatly restricting sampling. A new bidirectional transmission model allows measurements to be...
Conference Paper
Full-text available
Remote sensing methods to characterise individual trees could allow cost-effective phenotyping of genetics trials and even whole forests [1]. We aimed to develop and evaluate novel methods for using airborne laser scanning (ALS) data to phenotype individual trees in terms of key traits: tree size, stem form, wood quality and disease resistance. Dis...
Article
Seismic shaking and tectonic deformation during strong earthquakes can trigger widespread environmental effects. The severity and extent of a given effect relates to the characteristics of the causative earthquake and the intrinsic properties of the affected media. Documentation of earthquake environmental effects in well-instrumented, historical e...
Article
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Uruguay has adopted cut-to-length (CTL) machines in forest harvesting operations, especially in large scale, fast-growing plantations. The majority of modern CTL machines have on-board computers that capture individual tree data and can be coupled with global navigation satellite systems (GNSS). This provides the opportunity to collect data for res...
Conference Paper
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Urban trees surrounded by grass are susceptible to mechanical wounding caused lawnmowers and trimmers. Anecdotally this problem appears to be pervasive, affecting trees planted in school and university grounds, parks, botanical gardens, golf courses, roadsides and indeed any location where grass is maintained on a regular basis. This talk presents...
Conference Paper
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This talk explores how we can use off-the-shelf digital cameras and free software to produce dimensionally correct 3D models of real trees in our urban forest. The technologies have the potential to change the way we measure trees and undertake urban forest inventories. With the support of the TREE FUND’s John Z. Duling Grant, we present results of...
Conference Paper
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This presentation explores large trees in cities, whether they are present in high numbers or are under threat. While species selection and species diversity are addressed frequently in urban forestry discussions, less attention is paid to structural diversity. However, we know that numerous urban forest benefits are directly related to tree size,...
Article
Good forest management requires comprehensive and reliable inventory data spanning large areas. Forest management has increasingly relied on remote sensing, specifically light detection and ranging (LiDAR). However, due to the high costs associated with data collection and processing, wall-to-wall LiDAR data is rarely obtained for forests. In contr...
Article
Water movement between soil and the atmosphere is restricted by hardscapes in the urban environment. Some green infrastructure is intended to increase infiltration and storage of water, thus decreasing runoff and discharge of urban stormwater. Bioswales are a critical component of a water-sensitive urban design (or a low-impact urban design), and i...
Article
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The purpose of this report is to inform the New Zealand forest industry of test results for a new tree counting system, discuss the potential for inventory applications, and identify future developments. The new methodology utilises calibration counts, made either on the ground or on an image, to obtain accurate estimates of total tree counts for f...
Conference Paper
Full-text available
This presentation explores the existence of mature trees in cities, their role, and measures to protect and retain them. While discussions of species selection and species diversity are topical and relevant, less attention is paid to structural diversity. However, we know that numerous urban forest benefits are directly related to tree size, so it'...