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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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Tree water use and amelioration of dryland salinity. Dryland salinity is a huge problem for large areas of Australia. One proposal for ameliorating dryland salinity is to plant trees in upslope sites in the landscape. Such planted forests reduce movement of water through the landscape, thereby reducing mobilisation and discharge of stored salts downslope onto agricultural and sensitive riparian areas. This project will investigate tree water use in a native forest, compare it with a planted fo ....Tree water use and amelioration of dryland salinity. Dryland salinity is a huge problem for large areas of Australia. One proposal for ameliorating dryland salinity is to plant trees in upslope sites in the landscape. Such planted forests reduce movement of water through the landscape, thereby reducing mobilisation and discharge of stored salts downslope onto agricultural and sensitive riparian areas. This project will investigate tree water use in a native forest, compare it with a planted forest in the same location and investigate fundamental relationships among climate, tree size, canopy area and water use. The outcome of this project is a deep mechanistic understanding of the efficacy of trees for salinity abatement.Read moreRead less
Mechanisms linking site water status and net primary productivity. Australia is the driest of all inhabited continents and also has the lowest primary productivity. This project will determine the mechanisms linking these observations. Through development of a detailed mechanistic understanding of how site water balance determines site productivity and application of this understanding in a state-of-the-art model, we shall improve forest and water resource management and our understanding of the ....Mechanisms linking site water status and net primary productivity. Australia is the driest of all inhabited continents and also has the lowest primary productivity. This project will determine the mechanisms linking these observations. Through development of a detailed mechanistic understanding of how site water balance determines site productivity and application of this understanding in a state-of-the-art model, we shall improve forest and water resource management and our understanding of the unique ecology of Australia.Read moreRead less
Increasing sandalwood (Santalum spicatum) recruitment in regional Western Australia through mammal conservation. The highly prized sandalwood is the basis of an industry that employs over 100 people and generates $12 million export income annually in regional WA. Natural recruitment of sandalwood is poor. This project will build on research, conducted by Murdoch University and the Forest Products Commission, that indicates natural recruitment of the tree is greatly enhance in the presence of nat ....Increasing sandalwood (Santalum spicatum) recruitment in regional Western Australia through mammal conservation. The highly prized sandalwood is the basis of an industry that employs over 100 people and generates $12 million export income annually in regional WA. Natural recruitment of sandalwood is poor. This project will build on research, conducted by Murdoch University and the Forest Products Commission, that indicates natural recruitment of the tree is greatly enhance in the presence of native rat-kangaroos who cache the seeds. This project will train an APA(I) postgraduate through an industry based project that will evaluate increased recruitment of sandalwood by native mammal caching. Many of these mammals are Conservation Dependent or Threatened with extinction.Read moreRead less
Applying macroecology to assist in the management of Kakadu National Park. The ecological integrity of Kakadu National Park is threatened by fires, weeds, and feral animals. To help tackle these problems, we will develop a cost-effective, culturally appropriate, park-wide monitoring system based on changes in the boundaries of closed forests, woodland and grassland. We will gauge the effect of broad-scale land management interventions, and predict the consequences of future change. The findings ....Applying macroecology to assist in the management of Kakadu National Park. The ecological integrity of Kakadu National Park is threatened by fires, weeds, and feral animals. To help tackle these problems, we will develop a cost-effective, culturally appropriate, park-wide monitoring system based on changes in the boundaries of closed forests, woodland and grassland. We will gauge the effect of broad-scale land management interventions, and predict the consequences of future change. The findings of this study will be transferable to other landscape settings in Australia and overseas. It will contribute to debates about the ecological consequences of current land management practices and how these compare with past Aboriginal land management.Read moreRead less
Landscape-scale population dynamics of open forests in the Australian monsoon tropics. Over the last century there has been a trend of increasing tree cover in many landscapes. Yet the causes of this globally important ecological phenomenon are poorly understood, but may include the effects of climate, fire, grazing and CO2. We will determine how an area of forest has changed over 50 years in Kakadu National Park, linking forest demography with remote sensing techniques, re-measurement and analy ....Landscape-scale population dynamics of open forests in the Australian monsoon tropics. Over the last century there has been a trend of increasing tree cover in many landscapes. Yet the causes of this globally important ecological phenomenon are poorly understood, but may include the effects of climate, fire, grazing and CO2. We will determine how an area of forest has changed over 50 years in Kakadu National Park, linking forest demography with remote sensing techniques, re-measurement and analysis of long-term tree demography datasets, and simulation models of tree population dynamics on a landscape scale. This will provide a scientific framework to develop sustainable land management and the conservation of Australia's forest biodiversity.Read moreRead less
Predicting and improving the productivity of plants in future climates. Earth's atmospheric carbon dioxide (CO2) sustains all terrestrial vegetation, yet the effects of increasing concentrations of this gas on plant productivity are difficult to predict. The project aims to undertake experiments on the leaf-level processes that underpin plant productivity in multiple global vegetation systems. This could enable the development of a new theoretical approach to predicting plant productivity in cha ....Predicting and improving the productivity of plants in future climates. Earth's atmospheric carbon dioxide (CO2) sustains all terrestrial vegetation, yet the effects of increasing concentrations of this gas on plant productivity are difficult to predict. The project aims to undertake experiments on the leaf-level processes that underpin plant productivity in multiple global vegetation systems. This could enable the development of a new theoretical approach to predicting plant productivity in changed environmental circumstances at all scales. The results of this project could provide new tools for understanding the vulnerabilities and sensitivities of natural and managed landscapes under environmental pressures associated with increasing CO2.Read moreRead less
Grazing-fire interactions and vegetation dynamics. Grazing and fire are the two major cost-effective tools that can be used to manipulate the vegetation of reserves and rangelands. This project will result in information and models that will enable a more effective use of grazing than at present in natural vegetation management for both nature conservation and production. An understanding of the ways in which vertebrate grazing animals influence the incidence and intensity of fire is also highly ....Grazing-fire interactions and vegetation dynamics. Grazing and fire are the two major cost-effective tools that can be used to manipulate the vegetation of reserves and rangelands. This project will result in information and models that will enable a more effective use of grazing than at present in natural vegetation management for both nature conservation and production. An understanding of the ways in which vertebrate grazing animals influence the incidence and intensity of fire is also highly important in planning to prevent the occasional vegetation fire that causes substantial losses of life, property and conservation values, especially in the context of predicted climatic change.Read moreRead less