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How are microorganisms and nutrient cycling in saline soils affected by soil matric potential? Dryland agriculture is threatened by salinity and drought, and it is well-known that individually, both can decrease not only crop growth but also microbial activity and nutrient cycling which are critical for sustainability. As our climate becomes drier, it is necessary to understand how microbial activity and nutrient cycling in saline soils will be affected by drought and sporadic summer rainfall ev ....How are microorganisms and nutrient cycling in saline soils affected by soil matric potential? Dryland agriculture is threatened by salinity and drought, and it is well-known that individually, both can decrease not only crop growth but also microbial activity and nutrient cycling which are critical for sustainability. As our climate becomes drier, it is necessary to understand how microbial activity and nutrient cycling in saline soils will be affected by drought and sporadic summer rainfall events. As an international team of soil biologists, we will investigate the interactions between salinity and soil moisture on microbial activity and nutrient cycling. The results will provide insights into nutrient cycling in saline soils now and in the future and the benefit of amelioration strategies.Read moreRead less
Catchment restoration: generating prescriptions for evidence-based best practice in the future, from experience of the past. Catchment management programs, supported by substantial government finances, have been leading landscape rehabilitation measures across Australia for more than a decade. Few, if any, projects assessed the outcomes of the measures in terms of action success, plant survivability, landscape stabilisation and water resource benefit. This project will audit the proposed and act ....Catchment restoration: generating prescriptions for evidence-based best practice in the future, from experience of the past. Catchment management programs, supported by substantial government finances, have been leading landscape rehabilitation measures across Australia for more than a decade. Few, if any, projects assessed the outcomes of the measures in terms of action success, plant survivability, landscape stabilisation and water resource benefit. This project will audit the proposed and actual rehabilitation measures undertaken in five catchments and assess the modern condition of plantations, catchments and waterways. Lessons from this audit will generate prescriptions that will be integrated into a web decision support system optimising the outcomes from future catchment management in terms of biodiversity, landscape stability and stream condition.Read moreRead less
The potential of biosolids and flyash mixtures for soil remediation for revegetation of degraded land. Revegetation of land that has been subjected to land clearing or mining is often limited by the poor quality or lack of topsoil. It may prove possible to remediate these areas of land by incorporating a mixture of two waste products, biosolids and flyash. The aim in this project is to determine the usefulness of this method of land remediation by investigating the nutrient levels and fate of co ....The potential of biosolids and flyash mixtures for soil remediation for revegetation of degraded land. Revegetation of land that has been subjected to land clearing or mining is often limited by the poor quality or lack of topsoil. It may prove possible to remediate these areas of land by incorporating a mixture of two waste products, biosolids and flyash. The aim in this project is to determine the usefulness of this method of land remediation by investigating the nutrient levels and fate of contaminants in various mixtures of biosolids and flyash materials, in the absence and presence of soil minerals, and soil ameliorants such as fertilizers and gypsum.Read moreRead less
Development of New Generation Tools for Regional-Scale Mapping of Noxious Weeds. This project aims to determine the potential of new remote sensing and analytical tools for cost-effectively mapping weed infestations. We envisage integrating high resolution air- and satellite-borne technology, GIS and GPS, so that weeds' distribution and spread over time can be mapped efficiently. Two contrasting case studies will be selected, an annual/biennial herbaceous agricultural weed and a woody weed of se ....Development of New Generation Tools for Regional-Scale Mapping of Noxious Weeds. This project aims to determine the potential of new remote sensing and analytical tools for cost-effectively mapping weed infestations. We envisage integrating high resolution air- and satellite-borne technology, GIS and GPS, so that weeds' distribution and spread over time can be mapped efficiently. Two contrasting case studies will be selected, an annual/biennial herbaceous agricultural weed and a woody weed of semi-arid and arid rangelands. Both are of significant importance nationally, and in Western Australia. Results will be both directly relevant to the management of these specific weeds, and to the development of similar mapping and monitoring systems for other weeds.Read moreRead less
Phytoextraction approaches for mitigating heavy metal release from unlined and loosely capped rural landfills. Australian rural landfills are used for storing hazardous wastes which contain toxic metals. Impermeable clay caps are often utilized to encapsulate these wastes and prevent release of pollutants into the environment. The integrity of these caps is crucial and requires constant care. The project aims to develop novel approaches which will improve substantially the long-term environmenta ....Phytoextraction approaches for mitigating heavy metal release from unlined and loosely capped rural landfills. Australian rural landfills are used for storing hazardous wastes which contain toxic metals. Impermeable clay caps are often utilized to encapsulate these wastes and prevent release of pollutants into the environment. The integrity of these caps is crucial and requires constant care. The project aims to develop novel approaches which will improve substantially the long-term environmental safety of rural landfills and deliver additional economic benefits. These approaches involve the use of high-value tree crops and plants capable of extracting toxic metals. Utilization of these plants will create a valuable resource on an otherwise derelict area and this will be of considerable local/regional benefit and national significance.Read moreRead less
Role of vegetation patchiness and self organisation in the ecohydrologic response of water limited ecosystems to climate variability and change. The semi-arid Australian rangelands are some of the most sensitive regions to degradation and climate change, particularly with respect to hydrology and ecology. Our predictive ability in these environments is quite poor, however, climatic change (particularly changes in rainfall regimes) are expected to intensify vegetation patterning, intensify erosi ....Role of vegetation patchiness and self organisation in the ecohydrologic response of water limited ecosystems to climate variability and change. The semi-arid Australian rangelands are some of the most sensitive regions to degradation and climate change, particularly with respect to hydrology and ecology. Our predictive ability in these environments is quite poor, however, climatic change (particularly changes in rainfall regimes) are expected to intensify vegetation patterning, intensify erosion and reduce runoff. This project will develop a modelling framework to better understand the impact of these natural (climate variability and change) and anthropogenic (grazing, deforestation) disturbances on runoff and erosion in these regions.Read moreRead less
Demonstrating the impacts of ground tank closure on biodiversity and landscape function in southeast Australian rangelands. Despite incentives for improving biodiversity outcomes in pastoral landscapes pastoralists are resistant to strategic tank closure. Research will monitor the effects of total-closure, partial-closure and fencing of ground tanks on biodiversity. Results of research will be built into a model to assist land managers in decision making. The research will be conducted in conjun ....Demonstrating the impacts of ground tank closure on biodiversity and landscape function in southeast Australian rangelands. Despite incentives for improving biodiversity outcomes in pastoral landscapes pastoralists are resistant to strategic tank closure. Research will monitor the effects of total-closure, partial-closure and fencing of ground tanks on biodiversity. Results of research will be built into a model to assist land managers in decision making. The research will be conducted in conjunction with land management authorities thus outcomes can be readily passed on to relevant user groups. The project will aid in the adoption of sustainable land management practices in relation to total grazing pressure and biodiversity. The research within arid woodland and shrubland communities is applicable to a large area of Australia's rangelands.Read moreRead less
Ecological sustainability and changing land use in the Pilbara. Land use change is frequently associated with large changes in key elements of 'sustainability? ? biodiversity, productivity, and water and nutrient cycles. However, in the Pilbara, fires and flooding rains are so frequent that detecting consequences of land use change is frequently confounded by other ?disturbances?. We aim, through controlled field experiments, to disentangle effects of land use change (e.g. de-stocking of range ....Ecological sustainability and changing land use in the Pilbara. Land use change is frequently associated with large changes in key elements of 'sustainability? ? biodiversity, productivity, and water and nutrient cycles. However, in the Pilbara, fires and flooding rains are so frequent that detecting consequences of land use change is frequently confounded by other ?disturbances?. We aim, through controlled field experiments, to disentangle effects of land use change (e.g. de-stocking of rangelands, altered water availability through mining activity or infrastructure) from those of natural disturbance and variability (both spatially and temporally). This research will improve understanding of key areas in resilience of rangelands and of major processes that are critical for sustainable management.Read moreRead less
Is reintroduction of soil foraging animals critical for the restoration of degraded semi-arid woodlands? Locally-extinct animals are important, not only for their intrinsic value, but because they are thought to be essential for maintaining and restoring healthy ecosystems. This project will give us valuable insights into how ecosystems may have functioned prior to the loss of native animals, and how ecosystems can be restored when the animals are reintroduced. Our research will provide Australi ....Is reintroduction of soil foraging animals critical for the restoration of degraded semi-arid woodlands? Locally-extinct animals are important, not only for their intrinsic value, but because they are thought to be essential for maintaining and restoring healthy ecosystems. This project will give us valuable insights into how ecosystems may have functioned prior to the loss of native animals, and how ecosystems can be restored when the animals are reintroduced. Our research will provide Australian Wildlife Conservancy with the knowledge they need to continue their reintroductions, and information that encourages land managers to adopt strategies to ensure the survival of reintroduced animals outside of formal reserves. Read moreRead less
Electron transport catalysis in organohalide pollutant respiration. This project aims to understand the link between substrate specificity and gene sequence of dehalogenating enzymes in organohalide respiring bacteria (ORB) and the mechanism by which electrons are transferred to dehalogenating enzymes through protein-protein interactions. Organohalides were present in Earth's early history and now pollute the environment globally. Organohalide respiring bacteria (ORB) can degrade these pollutant ....Electron transport catalysis in organohalide pollutant respiration. This project aims to understand the link between substrate specificity and gene sequence of dehalogenating enzymes in organohalide respiring bacteria (ORB) and the mechanism by which electrons are transferred to dehalogenating enzymes through protein-protein interactions. Organohalides were present in Earth's early history and now pollute the environment globally. Organohalide respiring bacteria (ORB) can degrade these pollutants by using them as terminal electron acceptors in their respiratory metabolism. This represents one of the most ancient respiratory systems on Earth about which little is known. This project will add to our fundamental knowledge of microbial evolution and metabolic systems, and pave the way for next generation organohalide remediation technologies.Read moreRead less