Daniel Vaughan Murphy

Daniel Vaughan Murphy
University of Western Australia | UWA · UWA School of Agriculture and Environment

Professor Soil Science, PhD

About

191
Publications
61,812
Reads
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11,869
Citations
Introduction
Professor and Co-Director, SoilsWest, UWA School of Agriculture and Environment Australian Research Council Future Fellow (2012-2016) Chinese Academy Agricultural Science visiting Professor Chinese Academy of Science visiting Professor CRC-Polymers Interested in soil carbon, nutrient cycling, microbial ecology, greenhouse gas emissions, ecosystems, isotopes Field research in Australia, China and Arctic
Additional affiliations
January 2017 - June 2017
University of Western Australia
Position
  • Head of Department
January 2017 - December 2019
University of Western Australia
Position
  • Head of Department
January 2007 - December 2012
University of Western Australia

Publications

Publications (191)
Article
Full-text available
Nitrification, a key pathway of nitrogen (N) loss from agricultural soils, is performed by ammonia-oxidizing bacteria (AOB) and archaea (AOA). We examined the seasonal dynamics (2 years) of ammonia oxidizer gene abundances across a gradient of soil carbon (C) and N in a semi-arid soil after 8 years of tillage and crop residue treatments. AOB was mo...
Article
Full-text available
Due to their substantial volume, subsoils contain more of the total soil carbon (C) pool than topsoils. Much of this C is thousands of years old, suggesting that subsoils offer considerable potential for long-term C sequestration. However, knowledge of subsoil C behaviour and manageability remains incomplete, and subsoil C storage potential has yet...
Article
Not only do soils provide 98.7% of the calories consumed by humans, they also provide numerous other functions upon which planetary survivability closely depends. However, our continuously increasing focus on soils for biomass provision (food, fiber, and energy) through intensive agriculture is rapidly degrading soils and diminishing their capacity...
Article
Soil water repellency (SWR) is problematic in rainfed cropping soils as it decreases plant water use efficiency. The occurrence of SWR is often dependent on the prevailing soil water content, but the response of SWR to soil water content varies among studies. We undertook three experiments to investigate how the (i) drying method prior to experimen...
Article
Plastics are now widespread in the natural environment. Due to their size, microplastics (MPs; defined as particles <5 mm) in particular, have the potential to cause damage and harm to organisms and may lead to a potential loss of ecosystem services. Research has demonstrated the significant impact of MPs on aquatic systems; however, little is know...
Article
The leaching of base cations in acidic soils can result in calcium (Ca²⁺) and magnesium (Mg²⁺) deficiencies, which are important for microbial cell function. We aimed to determine if microbial carbon use efficiency (CUE) and microbial biomass carbon (MBC) were limited in acidic soils due to a lack of base cations. Microbial CUE across a range of ag...
Book
Free to download from https://books.apple.com/au/book/soil-quality-5-soil-biology/id1554057153. Soil Quality ebook series is a resource for farmers, agricultural professionals and students. Experts from their fields share current knowledge and best practice techniques in layers of information, allowing readers to choose the level of detail they re...
Article
Monitoring land degradation due to soil water repellency (SWR) through space and time is often complicated by different soil drying temperatures and drying times that generate artefacts causing inconsistent SWR results. This study aimed to develop a reproducible soil drying method at room temperature for the severity of potential SWR determination....
Article
The hydrology of water repellent soil is poorly understood, in part because measuring hydrophobicity often interferes with subsequent water flow. Since soil surface temperatures provide information on near surface water content, thermography offers the potential to indirectly monitor this hydrology non-invasively. Using a near-infrared thermal came...
Article
Full-text available
Ongoing impacts of climatic change especially moisture stress remain a global challenge to agricultural production and food security. Such abiotic effects directly influence soil microbial communities. Previously we demonstrated that polymeric hydrogels, able to provide specific interactions with soil microbial communities, enhance the dynamics and...
Article
Full-text available
In contrast to the situation in plants inhabiting most of the world’s ecosystems, mycorrhizal fungi are usually absent from roots of the only two native vascular plant species of maritime Antarctica, Deschampsia antarctica and Colobanthus quitensis. Instead, a range of ascomycete fungi, termed dark septate endophytes (DSEs), frequently colonise the...
Article
Full-text available
The microbial partitioning of organic carbon (C) into either anabolic (i.e. growth) or catabolic (i.e. respiration) metabolic pathways represents a key process regulating the amount of added C that is retained in soil. The factors regulating C use efficiency (CUE) in agricultural soils, however, remain poorly understood. The aim of this study was t...
Article
Soil water repellency (SWR) is an agricultural concern as it limits plant available water, leading to decreased crop yields at times when a drying climate and expanding population place increasing pressure on food production. Here we assessed a microbial inoculation that secretes biosurfactants and lipolytic enzymes and a chemical surfactant's abil...
Article
Full-text available
We aimed to determine the relationship between biochar properties and colonisation of roots by arbuscular mycorrhizal (AM) fungi in agricultural soil. We used a range of biochars that differed in pH, water holding capacity, C, N and P concentrations to investigate interactions between biochar and AM fungi. A glasshouse experiment was conducted with...
Article
Full-text available
Salinization is recognized as a threat to soil fertility worldwide. A challenge in understanding the effects of salinity on soil microbial communities is the fact that it can be difficult to disentangle the effects of salinity from those of other variables that may co-vary with salinity. Here we use a trait-based approach to identify direct effects...
Article
Manure application to soil has declined globally due to increased availability of mineral fertilizers. However, mineral fertilizer overuse has caused serious consequences for soil quality and the environment. We analyzed the results of 20 long-term field trials (22–32 years, start year [ranged from 1980 to 1990] to 2012) and combined this with a cl...
Article
Carbon use efficiency (CUE) describes the relative partitioning of carbon (C) between anabolic and catabolic processes within the soil microbial community. Further, it represents a major factor regulating the amount of C cascading through the trophic levels of the soil food web. How CUE relates to C supply, however, remains poorly understood. The p...
Book
Available for free download at https://books.apple.com/au/book/soil-quality-3-soil-organic-matter/id1444338744. Soil Quality ebook series is a resource for farmers, agricultural professionals and students. Experts from their fields share current knowledge and best practice techniques presented in layers of information, allowing readers to choose th...
Article
Full-text available
Managing the impact of anthropogenic and climate induced stress on plant growth remains a challenge. Here we show that polymeric hydrogels, which maintain their hydrous state, can be designed to exploit functional interactions with soil microorganisms. This microbial enhancement may mitigate biotic and abiotic stresses limiting productivity. The pr...
Article
Full-text available
Most studies on plant nutrition tend to focus on the topsoil (plough layer) and frequently neglect subsoil processes.However, cereal roots can potentially acquire nutrients including organic and inorganic nitrogen (N) from deep in the soil profile. Greater knowledge on the interaction of plants and microbes in subsoil environments is required to ev...
Article
Full-text available
One of the greatest contemporary challenges in terrestrial ecology is to determine the impact of climate change on the world’s ecosystems. Here we investigated how wetting patterns (frequency and intensity) and nutrient additions altered microbial biomass and CO2-C loss from a semi-arid soil. South-western Australia is predicted to experience decli...
Book
This publication Soil Quality - Constraints to plant production is freely available as a digital book on the iBooks store, with more books to follow soon. Copy link in browser and download free https://books.apple.com/au/book/soil-quality-1-constraints-to-plant-production/id1317079117. Experts from a range of organisations and farmers contributed...
Article
Increasing organic matter (OM) in soil promotes the delivery of vital ecosystem services, such as improving water retention, decreasing erosion, increasing plant productivity, and mitigating climate change through terrestrial carbon (C) sequestration. The formation of organo-mineral associations through microbial turnover of labile (i.e. easily dec...
Article
Full-text available
Agricultural production can be limited by low phosphorus (P) availability, with soil P being constrained by sorption and precipitation reactions making it less available for plant uptake. There are strong links between carbon (C) and nitrogen (N) availability and P cycling within soil P pools, with microorganisms being an integral component of soil...
Article
Full-text available
Rebuilding ‘lost’ soil carbon (C) is a priority in mitigating climate change and underpinning key soil functions that support ecosystem services. Microorganisms determine if fresh C input is converted into stable soil organic matter (SOM) or lost as CO2. Here we quantified if microbial biomass and respiration responded positively to addition of lig...
Presentation
Full-text available
Australia-China Joint Research Centre (ACJRC) of Healthy Soils for Sustainable Food Production and Environmental Quality. Soil is an integral component of the supply chain for food, fibre, and fresh water. Australian farmers must effectively manage their soil to meet growing national and global demand for food and continue as net exporters of food...
Article
Full-text available
Increasing soil organic matter (OM) is promoted as a strategy for improving the resilience of coarse-textured cropping soils in semi-arid climates. While increasing soil OM can benefit crop productivity, it can also enhance nitrous oxide (N2O) emissions in temperate climates. Our objective was to investigate if increasing soil OM affected soil gree...
Article
Full-text available
Ammonia oxidizing archaea (AOA) and bacteria (AOB) drive nitrification and their population dynamics impact directly on the global nitrogen cycle. AOA predominate in the majority of soils but an increasing number of studies have found that nitrification is largely attributed to AOB. The reasons for this remain poorly understood. Here, amoA gene abu...
Article
Full-text available
Few studies describe the primary drivers influencing soil organic carbon (SOC) stocks and the distribution of carbon (C) fractions in agricultural systems from semi-arid regions; yet these soils comprise one fifth of the global land area. Here we identified the primary drivers for changes in total SOC and associated particulate (POC), humus (HOC) a...
Article
Full-text available
Long-term manure application is recognized as an efficient management practice to enhance soil organic carbon (SOC) accumulation and nitrogen (N) mineralization capacity. A field study was established in 1979 to understand the impact of long-term manure and/or chemical fertilizer application on soil fertility in a continuous maize cropping system....
Data
S1 Dataset was the data of SOC, total N, potential C and N mineralization, soil microbial biomass carbon, nitrogen and metabolic quotient. This data contained two parts: (1). Soil organic carbon, total nitrogen, potential C and N mineralization in bulk soil and different particle-size fractions from the control (CK) or soil that received 32 years o...
Article
Full-text available
Phosphorus (P) fertilisers have long been applied to sandy soils in south-western Australia to enhance agricultural production. However, significant P leaching is experienced which decreases P availability to crops. The aim of this study was to determine if biochar could be used as a soil amendment to decrease P leaching and increase P uptake by wh...
Presentation
Full-text available
Presentation on nano-scale secondary ion mass spec (NanoSIMS) to the Chinese Academy of Agricultural Sciences (where I hold a visiting professorship)
Presentation
Full-text available
These slides contain my opinions and suggestions on manuscript writing. You may agree or disagree. I run this as a 3 hour tutorial in China as part of my visiting professorship with the Chinese Academy of Agricultural Sciences (CAAS). I ask the students to bring an example paper (often their own manuscript that we are working on) that they can anal...
Article
Full-text available
Water pulses have a significant impact on nitrogen (N) cycling, making management of N challenging in agricultural soils that are exposed to episodic rainfall. In hot, dry environments, wetting of dry soil during summer fallow causes a rapid flush of organic matter mineralisation and subsequent nitrification, which may lead to N loss via nitrous ox...
Article
Full-text available
The need for increased food production to support the growing global population requires more efficient nutrient management and prevention of nitrogen (N) losses from both applied fertiliser and organic matter (OM) decomposition. This is particularly important in semi-arid rainfed cropping soils, where soil water and temperature are the dominant dr...
Article
Full-text available
Ammonia-oxidising archaea (AOA) and bacteria (AOB) are responsible for the rate limiting step in nitrification; a key nitrogen (N) loss pathway in agricultural systems. Dominance of AOA relative to AOB in the amoA gene pool has been reported in many ecosystems, although their relative contributions to nitrification activity are less clear. Here we...
Article
Full-text available
We aimed to quantify the relative contributions of plant residue and organic manure to soil carbon sequestration. Using a 27-year-long inorganic fertilizer and manure amendment experiment in a maize (Zea mays L.) double-cropping system, we quantified changes in harvestable maize biomass and soil organic carbon stocks (0-20 cm depth) between 1986-20...
Presentation
Full-text available
Lessons learnt from the Australian Soil Quality Monitoring Program
Conference Paper
Multicore systems are an integral part of today's embedded systems which allow for improved performance and reduced power consumption. Designing and creating a multicore system is challenging. Verification and validation of the designed multicore system incur significant cost and effort. A simpler design process will allow even the software enginee...
Data
Full-text available
Fig. S1Experimental set up. Fig. S2Light micrograph of a transverse section through an immature wheat root (Triticum aestivum). Fig. S3Correspondence analysis (CA) based on C concentration and concentration of excess 13C of phospho- and neutral lipid fatty acid biomarkers extracted from soil associated with wheat (Triticum aestivum) roots or associ...
Article
Full-text available
Plants rapidly release photoassimilated carbon (C) to the soil via direct root exudation and associated mycorrhizal fungi, with both pathways promoting plant nutrient availability. This study aimed to explore these pathways from the root's vascular bundle to soil microbial communities. Using nanoscale secondary ion mass spectrometry (NanoSIMS) ima...
Article
We determined the historical change in soil organic carbon (SOC) stocks from long-term inorganic fertilizer and/or organic manure trials (maize and wheat dominated rotations) that represent major soil types and climatic conditions of northern China. Soil carbon (RothC, Rothamsted, UK) and general circulation models (BCCR, Bjerknes Centre for Climat...
Article
Full-text available
The addition of clay to lime-amended biosolids has been proposed as a soil amendment (LaBC®) for remediating acidic-sandy soil. We investigated whether the presence of clay in LaBC® altered soilmicrobial processes over a 30-week period. Aerobic-incubation and CO2 respiration assays were used to monitor water repellence and chemical and microbiologi...
Article
Full-text available
Improving below-ground physical, chemical and biological properties is crucial to developing sustainable vegetation cover on mine tailings or mineral processing residues. This study evaluated amendments with the potential to alleviate constraints to plant growth in residue generated from the refining of bauxite to produce alumina. The effects of te...
Article
Full-text available
Here we take advantage of the stable carbon isotope shift that occurs when a C4 plant is sown into a soil previously dominated by C3 vegetation, to explore the movement and fate of newly sequestered soil organic carbon (SOC) following establishment of subtropical perennial pastures in temperate regions of Australia. In kikuyu-based pastures up to 3...
Conference Paper
It is widely known that Multiprocessor Systems-on-Chip (MPSoC) is the driving force behind many embedded devices. State-of-the-art mobile phones and gaming consoles contain more than four processors in their MPSoC. Performance counters have become the recent trend in these devices to perform runtime adaptations to match power and performance budget...
Presentation
Full-text available
The ISA-CAS and UWA Joint Laboratory for Soil Systems Biology was jointly established by The Institute of Subtropical Agriculture, Chinese Academy of Sciences (ISA-CAS) and the University of Western Australia (UWA) on 26 November 2013. The main tasks of this joint laboratory are cooperative research, academic exchange, and capacity building in soil...
Data
Laboratory experiments were undertaken to examine the effects of high soil temperatures on N biotransformations in sandy soils. Soils were incubated at 30°C, 40°C, 50°C, and 60°C for 2 days, before all treatments were kept at 30°C for up to 41 days. Another laboratory experiment evaluated the effect of different cycles of exposure to 50°C and 30°C,...
Article
This study addressed if long-term combined application of organic manure and inorganic fertilizers could improve the synchrony between nitrogen (N) supply and crop demand. 15 N-labeled urea was applied to micro-plots within three different fertilized treatments (no fertilizer, No-F soil; inorganic NPK fertilizers, NPK soil; and manure plus inorgani...
Article
Full-text available
Over the past 20 years, our understanding of soil nitrogen (N) cycling has changed with evidence that amino acids are major substrates for both soil microorganisms and plants. However, the recent discovery that plants and microorganisms can directly utilize small peptides in soil needs to be evaluated for its ecological significance, because peptid...
Article
Full-text available
The ability of plants to compete effectively for nitrogen (N) resources is critical to plant survival. However, controversy surrounds the importance of organic and inorganic sources of N in plant nutrition because of our poor ability to visualize and understand processes happening at the root–microbial–soil interface. Using high-resolution nano-sc...
Data
Full-text available
Fig S1 Amount of held on the soil’s solid phase as a function of solution concentration. Fig S2 Total amount of present in soil solution and held on the soil’s cation exchange phase in Triticum aestivum planted and unplanted microcosms. Fig S3 Time-dependent mineralization of 14C-labelled glutamate in soil in the presence and absence of wheat (Trit...