Hydraulic Properties of Swelling Clay-Gel Soils: Electrolyte and Temperature Effects. We seek to understand the impacts of electrolytes and temperature on the equilibrium and water flow properties of swelling, clay-gel soils. These soils are important in cropping, the environment and industrial processes. Their hydraulic properties govern dewatering rates, rheology, and solute movement. Double layer theory (DLVO) successfully describes the equilibrium behaviour of model, parallel-plate clay syst ....Hydraulic Properties of Swelling Clay-Gel Soils: Electrolyte and Temperature Effects. We seek to understand the impacts of electrolytes and temperature on the equilibrium and water flow properties of swelling, clay-gel soils. These soils are important in cropping, the environment and industrial processes. Their hydraulic properties govern dewatering rates, rheology, and solute movement. Double layer theory (DLVO) successfully describes the equilibrium behaviour of model, parallel-plate clay systems in laboratories. However, equilibrium and water transport properties of less-ideal, clay slurries are poorly described by theory. Field clay-gels are therefore problematic. Outcomes will be better understanding of swelling clays, improved and more cost effective management techniques for gel soils and trained graduates.Read moreRead less
Special Research Initiatives - Grant ID: SR0354511
Funder
Australian Research Council
Funding Amount
$10,000.00
Summary
Soil Acidification, the Environment and Production. Soil acidification affects 50% of Australia's agricultural land and is the most important economic constraint to agricultural. In addition, major external offsite impacts include greenhouse gas emissions, reduced stream and ground water health, reduced biodiversity, increased salinity and waterlogging and infrastructure damage. The aim of this network is to quantify the acidification processes and the connection of these processes to the offsit ....Soil Acidification, the Environment and Production. Soil acidification affects 50% of Australia's agricultural land and is the most important economic constraint to agricultural. In addition, major external offsite impacts include greenhouse gas emissions, reduced stream and ground water health, reduced biodiversity, increased salinity and waterlogging and infrastructure damage. The aim of this network is to quantify the acidification processes and the connection of these processes to the offsite impacts. This will lead to development of strategic plans for acidified and potential acid soils and associate offsite impacts, as well as identifying knowledge gaps and building research and policy synergies. Read moreRead less
Assessing soil formation and erosion balances in the Top End with an expanded toolkit. This work is timely as it will provide the tools and the data to assess the sustainability with regard to soil loss of potential agricultural development in the Top End of Australia. With food-growing areas in southern Australia under stress from a prolonged drought, the Federal Government has established a Northern Australia Land and Water Taskforce to explore the potential of the Top End for agricultural and ....Assessing soil formation and erosion balances in the Top End with an expanded toolkit. This work is timely as it will provide the tools and the data to assess the sustainability with regard to soil loss of potential agricultural development in the Top End of Australia. With food-growing areas in southern Australia under stress from a prolonged drought, the Federal Government has established a Northern Australia Land and Water Taskforce to explore the potential of the Top End for agricultural and other development. A key component of its brief is that development must be sustainable. The economic consequences of increased agriculture in the North are likely to be profound, and the findings of this research will be crucial to success.Read moreRead less
Linking soil acidification with carbon dynamics in Australian agroecosystems. The ability to mitigate climate change by sequestering soil carbon may be limited in acidic soils, which are prevalent in Australia. The project will investigate the link between carbon cycling, soil acidification and liming, and provide important knowledge to identify agricultural practices which have the capacity to build soil carbon.
Linkage Infrastructure, Equipment And Facilities - Grant ID: LE0560895
Funder
Australian Research Council
Funding Amount
$854,354.00
Summary
A new-generation gas-source radiocarbon system for integrated environmental and archaeological research. An ultra-sensitive radiocarbon analysis system, proposed here, is central to new, multi-institution research into past fluctuations of Australia's climate, natural resources and ecosystems. Focussed on the 40,000 years of human presence, the research is an integrated approach to changes of earth systems in the Australian region.The equipment is a single-stage accelerator mass spectrometer (SS ....A new-generation gas-source radiocarbon system for integrated environmental and archaeological research. An ultra-sensitive radiocarbon analysis system, proposed here, is central to new, multi-institution research into past fluctuations of Australia's climate, natural resources and ecosystems. Focussed on the 40,000 years of human presence, the research is an integrated approach to changes of earth systems in the Australian region.The equipment is a single-stage accelerator mass spectrometer (SSAMS) with an innovative gas-fed ion source and automated gas-handling system, with simpler processing and smaller samples than present AMS facilities. Future developments include automated multi-sample handling and coupling to microprobe and chromatographic analysers for microscale radiocarbon analysis of complex substances.Read moreRead less
Linkage Infrastructure, Equipment And Facilities - Grant ID: LE0560868
Funder
Australian Research Council
Funding Amount
$552,475.00
Summary
SHRIMP SI - Microscale stable-isotope analysis in the Earth Sciences. Stable-isotope variations of elements such as oxygen, carbon, and sulphur, preserve the most profound records of environmental conditions during the geological, biological, and climatic evolution of Earth and planets. We will build a stable isotope ion microprobe (SHRIMP SI) to examine extraterrestrial and terrestrial systems in unprecedented detail. In terrestrial applications, the main issue is accuracy at the 0.01 percent ....SHRIMP SI - Microscale stable-isotope analysis in the Earth Sciences. Stable-isotope variations of elements such as oxygen, carbon, and sulphur, preserve the most profound records of environmental conditions during the geological, biological, and climatic evolution of Earth and planets. We will build a stable isotope ion microprobe (SHRIMP SI) to examine extraterrestrial and terrestrial systems in unprecedented detail. In terrestrial applications, the main issue is accuracy at the 0.01 percent level for 20-micron spots, which we can apply to studies of development of life on Earth, climatic records, weathering, and formation of ore bodies. Sample return missions of solar wind and comets will provide unique samples related to the formation of our solar system.Read moreRead less
Unravelling soil carbon response to warming in fire-affected ecosystems. This project aims to reveal the continental pattern of soil carbon (C) response to warming in fire-affected ecosystems across Australia and to unravel the biogeochemical mechanisms underlying fire’s role in shaping the temperature sensitivity of soil respiration. Fire has modified over 40% of the Earth’s land surface and wildfire frequency is predicted to increase under global warming. This project expects to generate new k ....Unravelling soil carbon response to warming in fire-affected ecosystems. This project aims to reveal the continental pattern of soil carbon (C) response to warming in fire-affected ecosystems across Australia and to unravel the biogeochemical mechanisms underlying fire’s role in shaping the temperature sensitivity of soil respiration. Fire has modified over 40% of the Earth’s land surface and wildfire frequency is predicted to increase under global warming. This project expects to generate new knowledge on how fire influences soil-to-atmosphere C fluxes in a warmer climate using a multi-disciplinary approach. Expected outcomes include an enhanced capacity to predict the terrestrial ecosystem-to-atmosphere C fluxes and their feedbacks to climate under increasing frequency of fire using Earth-system models. Read moreRead less
Developing new techniques for mapping soil loss and movement in Australia. Soil erosion is a major problem for Australia. This project will develop and test a new and sensitive method to quantify soil loss and measure soil erosion and transport, using cutting-edge technologies conceived and developed in Australia.
Non-CO2 greenhouse gas emissions in afforested ecosystems in southeastern Australia - fluxes, processes and regional budget. There are no data available about the extent of emissions of the non-CO2 greenhouse gases nitrous oxide and methane from soils of forest ecosystems in Australia and the current methodolgy to quantify these emissions contains high uncertainties. Using the latest technology available we propose to i) measure emission rates of afforested ecosystems for non-CO2 greenhouse gase ....Non-CO2 greenhouse gas emissions in afforested ecosystems in southeastern Australia - fluxes, processes and regional budget. There are no data available about the extent of emissions of the non-CO2 greenhouse gases nitrous oxide and methane from soils of forest ecosystems in Australia and the current methodolgy to quantify these emissions contains high uncertainties. Using the latest technology available we propose to i) measure emission rates of afforested ecosystems for non-CO2 greenhouse gases in relation to previous land-use in southeastern Australia, ii) identify the processes controlling the emissions, iii) use the obtained data to calibrate a biogeochemical model, and iv) use the model to estimate regional inventories for non-CO2 greenhouse gas emissions in southeastern Australia.Read moreRead less
Integrative assessment of disturbance and land-use change on total greenhouse gas balance and nutrient cycling in savanna ecosystems. Climate change and variability is expected to have an impact on the NT environment and economy. This project will enable NT specific calibrations of climate variability-land use models, such as the National Carbon Accounting System. The NT Government will have access to a high quality database and calibrated models relating to greenhouse gas emissions as a functio ....Integrative assessment of disturbance and land-use change on total greenhouse gas balance and nutrient cycling in savanna ecosystems. Climate change and variability is expected to have an impact on the NT environment and economy. This project will enable NT specific calibrations of climate variability-land use models, such as the National Carbon Accounting System. The NT Government will have access to a high quality database and calibrated models relating to greenhouse gas emissions as a function of land use change. The project will improve estimates and management of GHG and provide a basis for the NT to potentially exploit future carbon-trading initiatives or GHG abatement schemes as fundamental data describing emissions as a function of land use will be available. This is of national significance given the size of the savanna biome in Australia.Read moreRead less