In vitro propagation (through somatic embryogenesis) of rush and sedge species important for land rehabilitation. This project aims to transform existing propagation methods for rushes and sedges (recalcitrant, but key colonizer species) for restoring critical biodiversity in Australian mine-site restoration. This will be achieved through the process of somatic embryogenesis and will result in cost effective and efficient mass propagation. Significantly, this somatic embryogenesis research will ....In vitro propagation (through somatic embryogenesis) of rush and sedge species important for land rehabilitation. This project aims to transform existing propagation methods for rushes and sedges (recalcitrant, but key colonizer species) for restoring critical biodiversity in Australian mine-site restoration. This will be achieved through the process of somatic embryogenesis and will result in cost effective and efficient mass propagation. Significantly, this somatic embryogenesis research will provide the springboard for development of seed analogues (coated, desiccated somatic embryos) with subsequent economies from bypassing more costly nursery production of whole plants, utilizing existing infrastructure for direct seeding of restoration sites, and reducing dependence on dwindling reserves of wild-harvested seed.Read moreRead less
The Biology, Ecology, Pathology and Control of Mycosphaerella Leaf Blights in Australian Eucalypt Plantations. Leaf spot diseases, caused by Mycosphaerella, have become widespread in over 150,000 ha of Eucalyptus globulus (blue gum) plantations in Western Australia, causing severe reduction in canopy area of young trees. This project will research the epidemiology of these diseases by studying the life cycles of the key pathogenic Mycosphaerella species identified in a previous project, modes an ....The Biology, Ecology, Pathology and Control of Mycosphaerella Leaf Blights in Australian Eucalypt Plantations. Leaf spot diseases, caused by Mycosphaerella, have become widespread in over 150,000 ha of Eucalyptus globulus (blue gum) plantations in Western Australia, causing severe reduction in canopy area of young trees. This project will research the epidemiology of these diseases by studying the life cycles of the key pathogenic Mycosphaerella species identified in a previous project, modes and timing of spore dispersal, the infection process, and host specificity. The economic impact of leaf spot diseases will be assessed from large exclusion trials. A predictive integrated management package for Mycosphaerella foliar diseases will be formulated and evaluated to minimising disease impact.Read moreRead less
The cause of basal stem rot in second rotation Eucalyptus globulus plantations. The Eucalyptus globulus plantation industry consists of over 300000 ha in Australia and is worth 1 billion dollars. The industry has expanded rapidly since the mid 1980's and now many crops are in their second rotation. Recently, poor coppice growth in second rotation crops as a result of fungal basal rot or decay, has started to become a significant management problem to the industry. This project will determine th ....The cause of basal stem rot in second rotation Eucalyptus globulus plantations. The Eucalyptus globulus plantation industry consists of over 300000 ha in Australia and is worth 1 billion dollars. The industry has expanded rapidly since the mid 1980's and now many crops are in their second rotation. Recently, poor coppice growth in second rotation crops as a result of fungal basal rot or decay, has started to become a significant management problem to the industry. This project will determine the cause(s) of basal stem rot/decay and develop management strategies to reduce the impact of the problem.Read moreRead less
Pathogenicity of Mycosphaerella on Eucalyptus globulus plantations in Western Australia. Eucalyptus globulus is the main hardwood species grown in plantations in Western Australia. In recent years, the incidence of foliar damage caused by leaf spot fungi in the genus Mycosphaerella has started to become a worrying management problem for the industry. There are approximately 12 Mycosphaerella species associated with Eucalyptus globulus in Western Australia. This project will determine which are t ....Pathogenicity of Mycosphaerella on Eucalyptus globulus plantations in Western Australia. Eucalyptus globulus is the main hardwood species grown in plantations in Western Australia. In recent years, the incidence of foliar damage caused by leaf spot fungi in the genus Mycosphaerella has started to become a worrying management problem for the industry. There are approximately 12 Mycosphaerella species associated with Eucalyptus globulus in Western Australia. This project will determine which are the priority destructive Mycosphaerella species. The information gained will allow researchers to select and breed eucalypts for resistance of target Mycosphaerella species in the future. The project will also develop methods for rapid pathogenicity screening.Read moreRead less
Improved growth of Pinus radiata through better modelling and management of photosynthesis and respiration. This research will use recently developed technologies to deliver the first comprehensive analysis of the effects of thinning and fertilizer on distribution of photosynthetically active proteins and nitrogenous metabolites in P. radiata. We seek to develop mechanistic and empirical understandings of photosynthesis, respiration, water use and growth and thus better model and predict effec ....Improved growth of Pinus radiata through better modelling and management of photosynthesis and respiration. This research will use recently developed technologies to deliver the first comprehensive analysis of the effects of thinning and fertilizer on distribution of photosynthetically active proteins and nitrogenous metabolites in P. radiata. We seek to develop mechanistic and empirical understandings of photosynthesis, respiration, water use and growth and thus better model and predict effects of management actions on yield of commercial softwood plantations. We will also apply similarly new but complementary and compatible technologies to assess photosynthesis, water use and respiration characteristics of a range of P. radiata genotypes of known growth potential. Our aim here is to develop new tools to help selection of high-yielding genotypes. The data collected will again be used to inform our development of a new growth model where the 'driver' of growth is respiration and where hydraulic architecture and soil water balance limits photosynthesis and water use.
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Understanding the underlying causes and practical management solutions to marri (Corymbia calophylla) decline in the south west of Western Australia. Tree declines threaten forests across much of Australia and efficient methods to understand and manage the causes are urgently needed. We will test a step-wise multidisciplinary model to determine the causes of marri (Corymbia calophylla) decline, which is currently threatening important ecosystem functions and biodiversity.
Ecophysiological limitations that affect water and carbon balance within large tree canopies: a comparative investigation. Supply of water to forest canopies is a major control of hydrological, atmospheric and biotic processes that impinge on groundwater stability, catchment yield, the fate of pollutants and plant productivity. Fundamental aspects of water transport and distribution within plant tissues remain obscured by conflicting experimental data and conflicting theoretical models that des ....Ecophysiological limitations that affect water and carbon balance within large tree canopies: a comparative investigation. Supply of water to forest canopies is a major control of hydrological, atmospheric and biotic processes that impinge on groundwater stability, catchment yield, the fate of pollutants and plant productivity. Fundamental aspects of water transport and distribution within plant tissues remain obscured by conflicting experimental data and conflicting theoretical models that describe physiological functioning.
Potential hydraulic constraints to the exchange of water and carbon between leaf and atmosphere require investigation before accurate models and informed decisions can be made with respect to the role of forests in biosphere-atmosphere processes. I will use large trees to investigate physiological and morphological determinants of hydraulic function and consider relationships between tree size, water requirements and water supply.
This project will foster comparative analyses of hydraulic functioning in large angiosperm and conifer species to elucidate universal principles that relate form to function and explain relationships between trees and their environment.
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Fire management of complex rehabilitated forests - quantifying and understanding spatial variability of forest structure and fuels. Up to 5 million ha of forest is burnt by bushfire in Australia in severe fire years. The cost of fire suppression in 2002/3 in WA was in excess of 12 million dollars. Consequently, development and application of technologies and knowledge for enhancing fire management and reducing wildfire risk is of high priority and substantial economic, social and environmental b ....Fire management of complex rehabilitated forests - quantifying and understanding spatial variability of forest structure and fuels. Up to 5 million ha of forest is burnt by bushfire in Australia in severe fire years. The cost of fire suppression in 2002/3 in WA was in excess of 12 million dollars. Consequently, development and application of technologies and knowledge for enhancing fire management and reducing wildfire risk is of high priority and substantial economic, social and environmental benefit. The opportunity to conduct experimental fires across a complex landscape will enable calibration and development of technologies not previously possible. This research will define the way prescribed fire is used to integrate young rehabilitated forest into management of the broader landscape and develop more cost-effective tools for fire management.Read moreRead less
Balancing Water Quality and Ecosystem Health with Water Yield -- Ecosystem Response to Thinning in Wungong Catchment. Reduced rainfall in past decades and future climate uncertainty have added a sense of urgency in Australia to search for new water resources to sustain a growing economy and population. A forest thinning trial is planned in the Wungong Catchment, Western Australia, to substantially increase water yield. Thinning is attractive as a low-cost option, and is potentially suitable for ....Balancing Water Quality and Ecosystem Health with Water Yield -- Ecosystem Response to Thinning in Wungong Catchment. Reduced rainfall in past decades and future climate uncertainty have added a sense of urgency in Australia to search for new water resources to sustain a growing economy and population. A forest thinning trial is planned in the Wungong Catchment, Western Australia, to substantially increase water yield. Thinning is attractive as a low-cost option, and is potentially suitable for other catchments. However the potential environmental and ecological impacts, which are major community concerns, must be investigated. This project will assess the levels of impact, associated ecosystem responses and the capacity of catchment ecosystems to sustain such management intervention.Read moreRead less
Carboxylate exudation and phosphorus acquisition in eucalypts. Eucalypts are thought to rely on mycorrhizas to acquire phosphorus (P). Using leaf manganese concentrations in the field to proxy rhizosphere carboxylates, followed by plant growth in low P-solutions, it was shown that some, but not all eucalypts that grow on P-impoverished soils release carboxylates from their roots. This trait is a strategy of Proteaceae to access soil P, but assumed not to be used by eucalypts. This game-changing ....Carboxylate exudation and phosphorus acquisition in eucalypts. Eucalypts are thought to rely on mycorrhizas to acquire phosphorus (P). Using leaf manganese concentrations in the field to proxy rhizosphere carboxylates, followed by plant growth in low P-solutions, it was shown that some, but not all eucalypts that grow on P-impoverished soils release carboxylates from their roots. This trait is a strategy of Proteaceae to access soil P, but assumed not to be used by eucalypts. This game-changing discovery challenges the current dogma that eucalypts invariably rely on mycorrhizas to acquire P. This project will explore the significance of this newly-described trait for functioning of eucalypts more broadly and produce results that are important for conservation, restoration and forestry activities. Read moreRead less