Population dynamics and genetic variation of plants with contrasting fire responses. We combine the traditional concerns of population viability analyses with the modern techniques of DNA fingerprinting for precise genotyping of individual plants and their seeds. We expect major breakthroughs in our understanding of how fire-killed species have survived thousands of years of frequent burning by Aborigines (by identifying seeds dispersed long distances from burnt parents); how paternity of offspr ....Population dynamics and genetic variation of plants with contrasting fire responses. We combine the traditional concerns of population viability analyses with the modern techniques of DNA fingerprinting for precise genotyping of individual plants and their seeds. We expect major breakthroughs in our understanding of how fire-killed species have survived thousands of years of frequent burning by Aborigines (by identifying seeds dispersed long distances from burnt parents); how paternity of offspring changes over the lifespan of plants which retain their seeds for many years; at what age within-plant genetic variation is at a maximum as a guide to optimal fire management; and the extent that deleterious somatic mutations explain low seed set among long-lived species.Read moreRead less
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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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
Biosecurity of Australia's eucalypts at risk from exotic diseases present in the Asian region. Biosecurity of Australia's flora and fauna is a National Research Priority, however currently there are no projects in Australia dealing with the threats and risks of exotic diseases to Australian native forests and hardwood plantations and consequently our proposed project is unique. It is through years of networking and collaboration that such a project is possible within our group. The network of sc ....Biosecurity of Australia's eucalypts at risk from exotic diseases present in the Asian region. Biosecurity of Australia's flora and fauna is a National Research Priority, however currently there are no projects in Australia dealing with the threats and risks of exotic diseases to Australian native forests and hardwood plantations and consequently our proposed project is unique. It is through years of networking and collaboration that such a project is possible within our group. The network of scientists put together in this project, both in Australia and Asia, results in a team of trained scientists studying and estimating the risk of existing disease threats and being vigilant for new disease threats. Read moreRead less
Initiation of spontaneous fires. This project aims to determine the origin of the initiation reactions that set off the self-heating of wood chips, coal, milk powder and other economically-important materials, leading to spontaneous fires. This project will provide fundamental understanding of the reactions between electronically excited species of oxygen and carbonaceous fuels, with applications to improved safety in wood, mineral and food industries. The outcomes include identification of the ....Initiation of spontaneous fires. This project aims to determine the origin of the initiation reactions that set off the self-heating of wood chips, coal, milk powder and other economically-important materials, leading to spontaneous fires. This project will provide fundamental understanding of the reactions between electronically excited species of oxygen and carbonaceous fuels, with applications to improved safety in wood, mineral and food industries. The outcomes include identification of the initiation mechanisms and development of mechanistic models that include the initiation step of the self-heating process, and development of new technologies for mitigation of spontaneous fires, based on quenching of the initiation reactions.Read moreRead less