ORCID Profile
0000-0003-0143-2190
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Soil Biology | Plant Biology | Environmental Management And Rehabilitation | Plant Physiology | Plant Physiology | Analytical Chemistry | Ecology | Analytical Spectrometry | Environmental Science and Management | Microbiology | Crop and Pasture Production | Physical Chemistry Of Macromolecules | Plant Nutrition | Environmental Biotechnology | Gene Expression | Environmental Impact Assessment | Soil Biology | Environmental Chemistry (incl. Atmospheric Chemistry) | Soil Chemistry (excl. Carbon Sequestration Science) | Plant Pathology | Conservation and Biodiversity | Microbial Ecology | Terrestrial Ecology | Soil And Water Sciences Not Elsewhere Classified | Environmental Rehabilitation (excl. Bioremediation) | Bioremediation |
ANZSRC Socio-Economic Objective (SEO)
Rehabilitation of degraded mining lands | Sown Pastures (excl. Lucerne) | Oilseeds | Field crops | Native forests | Wheat | Oil and gas | Living resources (flora and fauna) | Rehabilitation/reafforestation | Scientific instrumentation | Land and Water Management of environments not elsewhere classified | Ecosystem Assessment and Management not elsewhere classified | Land and water management | Remnant Vegetation and Protected Conservation Areas in Farmland, Arable Cropland and Permanent Cropland Environments | Rehabilitation of Degraded Mining Environments | Rehabilitation of Degraded Farmland, Arable Cropland and Permanent Cropland Environments | Native vegetation | Sown legumes
Related Links
Publications
Soil DNA chronosequence analysis shows bacterial community re‐assembly following post‐mining forest rehabilitation
Publisher: Wiley
Date: 18-05-2022
DOI: 10.1111/REC.13706
Abstract: Mining activities modify both aboveground and belowground ecological communities, presenting substantial challenges for restoration. The soil microbiome is one of these impacted communities and performs important ecosystem functions but receives limited focus in restoration. Sequencing soil DNA enables accurate and cost‐effective assessment of soil microbiota, allowing for comparisons across land use, environmental, and temporal gradients. We used licon sequencing of the bacterial 16s rRNA gene extracted from soil s les across a 28‐year post‐mining rehabilitation chronosequence to assess soil bacterial composition and ersity following rehabilitation at a bauxite mine in Western Australia's jarrah forest. We show that while bacterial alpha ersity did not differ between reference and rehabilitated sites, bacterial community composition changed dramatically across the chronosequence, suggesting strong impacts by mining and rehabilitation activities. Bacterial communities generally became increasingly similar to unmined reference sites with time since rehabilitation. Soil from sites rehabilitated as recently as 14 years ago did not have significantly different communities to reference sites. Overall, our study provides evidence indicating the recovery of soil bacterial communities toward reference states following rehabilitation. Including several ecological reference sites revealed substantial natural variability in bacterial communities from within a single mine site. We urge future restoration chronosequence studies to s le reference sites that geographically span the restored sites and/or are spatially paired with restored sites to ensure this variability is captured and to improve any inferences on recovery.
Too much of a good thing: phosphorus over-fertilisation in rehabilitated landscapes of high biodiversity value
Publisher: Australian Centre for Geomechanics, Perth
Date: 2019
Long-term conditioning of soil by plantation eucalypts and pines does not affect growth of the native jarrah tree
Publisher: Elsevier BV
Date: 02-2015
Arsenic-phosphorus interactions in the soil-plant-microbe system
Publisher: Elsevier BV
Date: 02-2018
DOI: 10.1016/J.ENVPOL.2017.09.098
Abstract: High arsenic (As) concentrations in the soil, water and plant systems can pose a direct health risk to humans and ecosystems. Phosphate (Pi) ions strongly influence As availability in soil, its uptake and toxicity to plants. Better understanding of As(V)-Pi interactions in soils and plants will facilitate a potential remediation strategy for As contaminated soils, reducing As uptake by crop plants and toxicity to human populations via manipulation of soil Pi content. However, the As(V)-Pi interactions in soil-plant systems are complex, leading to contradictory findings among different studies. Therefore, this review investigates the role of soil type, soil properties, minerals, Pi levels in soil and plant, Pi transporters, mycorrhizal association and microbial activities on As-Pi interactions in soils and hydroponics, and uptake by plants, elucidate the key mechanisms, identify key knowledge gaps and recommend new research directions. Although Pi suppresses As uptake by plants in hydroponic systems, in soils it could either increase or decrease As availability and toxicity to plants depending on the soil types, properties and charge characteristics. In soil, As(V) availability is typically increased by the addition of Pi. At the root surface, the Pi transport system has high affinity for Pi over As(V). However, Pi concentration in plant influences the As transport from roots to shoots. Mycorrhizal association may reduce As uptake via a physiological shift to the mycorrhizal uptake pathway, which has a greater affinity for Pi over As(V) than the root epidermal uptake pathway.
Sensitivity of seedling growth to phosphorus supply in six tree species of the Australian Great Western Woodlands
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/BT18247
Abstract: Many Australian native plants from regions with ancient, highly weathered soils have specialised adaptations for acquiring phosphorus (P) and can exhibit negative effects of excess P supply on growth and survival. Despite this, fertiliser (including P) is routinely applied in post-mining and other restoration schemes. In this study we investigated the effect of a range of applied P on the growth and tissue P concentrations for six woody species from the Great Western Woodlands (GWW) of Western Australia – a region that it not only bio erse, but that has experienced significant levels of mining related activities. Our data from a pot-based experiment show that all six species exhibited greater growth with increased P application up to 15 mg kg sand–1. However, at P concentrations in excess of 15 mg kg–1, dry mass accumulation did not increase further for three of the species tested. For the other three species, dry mass accumulation declined as the P concentration increased above 15 mg kg–1. For all of the study species, root and shoot P concentrations increased as the concentration of applied P increased. The internal shoot P concentration, at which dry matter accumulation either plateaued or started to decline, was in the range 1.95 to 3.2 mg P g–1 dry matter. This was ~2–4 times the concentration found in natural vegetation. These data suggest that in a restoration context, there is a potential risk that, excess P application may decrease plant growth rates for some species. Consequently, the addition of fertiliser to restored sites may have unpredictable impacts on the plant community by directly reducing the growth of some species but increasing the growth of others. We suggest that careful consideration should be given to designing appropriate fertiliser regimes for land restoration schemes in ancient P deplete landscapes to avoid the risk that fertiliser addition has the unwanted outcome of decreasing growth and survival of the target native species and increasing the abundance of unwanted weeds or aggressive pioneer species.
Interacting controls on innate sources of CO2 efflux from a calcareous arid zone soil under experimental acidification and wetting
Publisher: Elsevier BV
Date: 11-2015
The diversity of arbuscular mycorrhizas of selected Australian Fabaceae
Publisher: Informa UK Limited
Date: 07-2008
Variation in morphological and physiological parameters in herbaceous perennial legumes in response to phosphorus supply
Publisher: Springer Science and Business Media LLC
Date: 19-12-2010
Correlation between soil development and native plant growth in forest restoration after surface mining
Publisher: Elsevier BV
Date: 09-2017
Perennial legumes native to Australia - a preliminary investigation of nutritive value and response to cutting
Publisher: CSIRO Publishing
Date: 2007
DOI: 10.1071/EA06043
Abstract: Six Australian native herbaceous perennial legumes (Lotus australis, Swainsona colutoides, Swainsona swainsonioides, Cullen tenax, Glycine tabacina and Kennedia prorepens) were assessed in the glasshouse for nutritive value, soluble condensed tannins and production of herbage in response to three cutting treatments (regrowth harvested every 4 and 6 weeks and plants left uncut for 12 weeks). The Mediterranean perennial legumes Medicago sativa and Lotus corniculatus were also included. Dry matter (DM) yield of some native legumes was comparable to L. corniculatus, but M. sativa produced more DM than all species except S. swainsonioides after 12 weeks of regrowth. Dry matter yield of all native legumes decreased with increased cutting frequency, indicating a susceptibility to frequent defoliation. Shoot in vitro dry matter digestibility (DMD) was high ( %) in most native legumes, except G. tabacina (65%) and K. prorepens (55%). Crude protein ranged from 21–28% for all legumes except K. prorepens (12%). More frequent cutting resulted in higher DMD and crude protein in all species, except for the DMD of C. tenax and L. australis, which did not change. Concentrations of soluble condensed tannins were 2–9 g/kg DM in the Lotus spp., 10–18 g/kg DM in K. prorepens and negligible ( g/kg) in the other legumes. Of the native species, C. tenax, S. swainsonioides and L. australis showed the most promise for use as forage plants and further evaluation under field conditions is now warranted.
Correction to: Organic phosphorus in the terrestrial environment: a perspective on the state of the art and future priorities (Plant and Soil, (2018), 427, 1-2, (191-208), 10.1007/s11104-017-3391-x)
Publisher: Springer Science and Business Media LLC
Date: 02-12-2018
Next generation restoration metrics: Using soil eDNA bacterial community data to measure trajectories towards rehabilitation targets
Publisher: Elsevier BV
Date: 05-2022
DOI: 10.1016/J.JENVMAN.2022.114748
Abstract: In post-mining rehabilitation, successful mine closure planning requires specific, measurable, achievable, relevant and time-bound (SMART) completion criteria, such as returning ecological communities to match a target level of similarity to reference sites. Soil microbiota are fundamentally linked to the restoration of degraded ecosystems, helping to underpin ecological functions and plant communities. High-throughput sequencing of soil eDNA to characterise these communities offers promise to help monitor and predict ecological progress towards reference states. Here we demonstrate a novel methodology for monitoring and evaluating ecological restoration using three long-term (>25 year) case study post-mining rehabilitation soil eDNA-based bacterial community datasets. Specifically, we developed rehabilitation trajectory assessments based on similarity to reference data from restoration chronosequence datasets. Recognising that numerous alternative options for microbiota data processing have potential to influence these assessments, we comprehensively examined the influence of standard versus compositional data analyses, different ecological distance measures, sequence grouping approaches, eliminating rare taxa, and the potential for excessive spatial autocorrelation to impact on results. Our approach reduces the complexity of information that often overwhelms ecologically-relevant patterns in microbiota studies, and enables prediction of recovery time, with explicit inclusion of uncertainty in assessments. We offer a step change in the development of quantitative microbiota-based SMART metrics for measuring rehabilitation success. Our approach may also have wider applications where restorative processes facilitate the shift of microbiota towards reference states.
Forces that structure plant communities: quantifying the importance of the mycorrhizal symbiosis
Publisher: Wiley
Date: 08-11-2010
Evaluating soil extraction methods for chemical characterization of ultramafic soils in Kinabalu Park (Malaysia)
Publisher: Elsevier BV
Date: 2019
Mycorrhizal symbiosis and phosphorus supply determine interactions among plants with contrasting nutrient‐acquisition strategies
Publisher: Wiley
Date: 12-09-2021
Abstract: Highly erse plant communities growing on nutrient‐impoverished soils are test beds for theories on species coexistence. Here, neighbouring mycorrhizal and non‐mycorrhizal plants compete for limited phosphorus. The impact of below‐ground interactions on community dynamics is underexplored. We used an experimental approach to investigate effects of inoculation with arbuscular mycorrhizal (AM) fungi and a phosphorus supply gradient on competitive and facilitative interactions among mixed assemblages of woody plants in microcosms. The plant species, one cluster root‐forming (CR) species and four AM species, are native to jarrah forest that grows on nutrient‐impoverished soils in south‐western Australia. We measured plant growth in microcosms, with and without inoculation with the AM fungus Rhizophagus irregularis , and across a gradient of P supply: 0, 9, 27 and 243 mg P per kg of soil. Our data show evidence of plant–plant facilitation at low P supply and competition at high P supply. Growth of the CR species, Hakea undulata , was highest in microcosms with 0P and without AM inoculation. One AM species, Bossiaea aquifolium , also performed better at lower P levels, possibly benefitting from P mobilised by H. undulata . The other three AM species, one strongly obligates, performed better at higher P levels. Data for Acacia celastrifolia suggested it was facultatively mycotropic, and because there was no correlation between AM colonisation and the relative inoculum effect, we suggest positive effects of AM inoculation at 9P might be due to benefits other than P acquisition, such as pathogen defence. Benefit of AM inoculation diminished for three of four mycorrhizal species at the highest P level as we had predicted. The fourth species, Eucalyptus marginata (jarrah), had higher growth in microcosms that were not inoculated with AM, perhaps because the species benefits more from ectomycorrhizas. Synthesis . Our experimental data suggest spatial heterogeneity of soil P, coupled with a ersity of nutrient‐acquisition strategies, and plasticity among plant–plant and plant–AM fungi interactions, contributes to plant species coexistence in the nutrient‐impoverished jarrah forest. Our research highlights the importance of below‐ground mechanisms for understanding factors determining community structure including a potential role of AM fungi in plant pathogen defence.
Poor regulation of phosphorus uptake and rhizosphere carboxylates in three phosphorus-hyperaccumulating species of Ptilotus
Publisher: Springer Science and Business Media LLC
Date: 29-12-2016
Phosphorus uptake and toxicity is delimited by mycorrhizal symbiosis in P-sensitive Eucalyptus marginata but not in P-tolerant Acacia celastrifolia
Publisher: Cold Spring Harbor Laboratory
Date: 28-09-2021
DOI: 10.1101/2021.09.28.462111
Abstract: Many plant species from regions with ancient, highly-weathered nutrient-depleted soils have specialised adaptations for acquiring P and are sensitive to excess P-supply. Mycorrhizal associations may regulate P-uptake at high external P-concentrations, potentially reducing P-toxicity. We predicted that excess P-application will negatively impact species from the nutrient-depleted jarrah forest of Western Australia and that mycorrhizal inoculation will reduce P-toxicity by regulating P-uptake. For seedlings of the N 2 -fixing legume Acacia celastrifolia and the tree species Eucalyptus marginata , we measured growth at P-concentrations of 0 to 90 mg kg −1 soil and in relation to inoculation with the arbuscular mycorrhizal fungus (AMF) Rhizophagus irregularis . Non-inoculated A . celastrifolia maintained leaf P-concentrations at mg g −1 dry mass (DM) across the range of external P-concentrations. However, for non-inoculated E . marginata , as external P-concentrations increased leaf P also increased, reaching mg g −1 DM at 30 mg P kg −1 soil. A . celastrifolia DM increased with increasing external P-concentrations, while E . marginata DM was maximal at 15 mg P kg −1 soil, declining at higher external P concentrations. Neither DM nor leaf P of A . celastrifolia were affected by inoculation with AMF. For E . marginata , even at 90 mg P kg −1 soil, inoculation with AMF resulted in leaf P remaining mg g −1 DM, and DM being maintained. These data strengthen the evidence base that AMF may not only facilitate P-uptake at low external P-concentrations, but are also important for moderating P-uptake at elevated external P-concentrations and maintaining plant P concentrations within a relatively narrow concentration range.
Soil carbon and litter development along a reconstructed biodiverse forest chronosequence of South-Western Australia
Publisher: Springer Science and Business Media LLC
Date: 19-09-2010
Freezing skeletal muscle tissue does not affect its decomposition in soil: Evidence from temporal changes in tissue mass, microbial activity and soil chemistry based on excised samples
Publisher: Elsevier BV
Date: 2009
DOI: 10.1016/J.FORSCIINT.2008.08.013
Abstract: The study of decaying organisms and death assemblages is referred to as forensic taphonomy, or more simply the study of graves. This field is dominated by the fields of entomology, anthropology and archaeology. Forensic taphonomy also includes the study of the ecology and chemistry of the burial environment. Studies in forensic taphonomy often require the use of analogues for human cadavers or their component parts. These might include animal cadavers or skeletal muscle tissue. However, sufficient supplies of cadavers or analogues may require periodic freezing of test material prior to experimental inhumation in the soil. This study was carried out to ascertain the effect of freezing on skeletal muscle tissue prior to inhumation and decomposition in a soil environment under controlled laboratory conditions. Changes in soil chemistry were also measured. In order to test the impact of freezing, skeletal muscle tissue (Sus scrofa) was frozen (-20 degrees C) or refrigerated (4 degrees C). Portions of skeletal muscle tissue (approximately 1.5 g) were interred in microcosms (72 mm diameter x 120 mm height) containing sieved (2mm) soil (sand) adjusted to 50% water holding capacity. The experiment had three treatments: control with no skeletal muscle tissue, microcosms containing frozen skeletal muscle tissue and those containing refrigerated tissue. The microcosms were destructively harvested at sequential periods of 2, 4, 6, 8, 12, 16, 23, 30 and 37 days after interment of skeletal muscle tissue. These harvests were replicated 6 times for each treatment. Microbial activity (carbon dioxide respiration) was monitored throughout the experiment. At harvest the skeletal muscle tissue was removed and the detritosphere soil was s led for chemical analysis. Freezing was found to have no significant impact on decomposition or soil chemistry compared to unfrozen s les in the current study using skeletal muscle tissue. However, the interment of skeletal muscle tissue had a significant impact on the microbial activity (carbon dioxide respiration) and chemistry of the surrounding soil including: pH, electroconductivity, ammonium, nitrate, phosphate and potassium. This is the first laboratory controlled study to measure changes in inorganic chemistry in soil associated with the decomposition of skeletal muscle tissue in combination with microbial activity.
The role of root exuded low molecular weight organic anions in facilitating petroleum hydrocarbon degradation: Current knowledge and future directions
Publisher: Elsevier BV
Date: 02-2014
DOI: 10.1016/J.SCITOTENV.2013.11.050
Abstract: Rhizoremediation is a bioremediation technique whereby enhanced microbial degradation of organic contaminants occurs within the plant root zone (rhizosphere). It is considered an effective and affordable 'green technology' for remediating soils contaminated with petroleum hydrocarbons (PHCs). This paper critically reviews the potential role of root exuded compounds in rhizoremediation, with emphasis on commonly exuded low molecular weight aliphatic organic acid anions (carboxylates). The extent to which remediation is achieved shows wide disparity among plant species. Therefore, plant selection is crucial for the advancement and widespread adoption of this technology. Root exudation is speculated to be one of the predominant factors leading to microbial changes in the rhizosphere and thus the potential driver behind enhanced petroleum biodegradation. Carboxylates can form a significant component of the root exudate mixture and are hypothesised to enhance petroleum biodegradation by: i) providing an easily degradable energy source ii) increasing phosphorus supply and/or iii) enhancing the contaminant bioavailability. These differing hypotheses, which are not mutually exclusive, require further investigation to progress our understanding of plant-microbe interactions with the aim to improve plant species selection and the efficacy of rhizoremediation.
Phosphorus supply affects seedling growth of mycorrhizal but not cluster-root forming jarrah-forest species
Publisher: Springer Science and Business Media LLC
Date: 31-01-2022
DOI: 10.1007/S11104-021-05268-2
Abstract: Fertiliser is often used to kick-start ecological restoration despite growing evidence of the potentially negative impacts on plant ersity. Jarrah ( Eucalyptus marginata ) forest species growing on nutrient (especially phosphorus) impoverished soils in southwestern Australia have a suite of adaptations for phosphorus (P) acquisition, including the formation of cluster roots, and associations with mycorrhizal fungi. Here we investigated how escalating P supply, along with a stoichiometric adjustment of nitrogen (N) supply, impacted the growth and nutrition of a wide range of jarrah forest seedlings. In a pot experiment, we measured seedling biomass and nutritional responses of 12 jarrah forest species to a gradient of P supply in relation to N supply, and for the mycorrhizal species, inoculation with arbuscular mycorrhizal fungi. Three cluster-root forming species did not respond to increasing P, probably because they were reliant on seed P. Generally, mycorrhizal species showed a positive biomass response to increasing P when N was available. Mycorrhizas benefited seedling growth at low P (9 mg P added per kg of jarrah forest soil) when N was also available, and were parasitic to seedling growth at high P (243 mg P/ kg soil) without additional N. These results highlight importance of P and N supply in determining the nature of the symbiosis between plants and mycorrhizal fungi. Since P supply has the potential to reduce plant growth, for a range of species, our results suggest careful consideration of fertiliser amounts for ecological restoration of ecosystems adapted to nutrient poor soils.
Ecological implications of pedogenesis and geochemistry of ultramafic soils in Kinabalu Park (Malaysia)
Publisher: Elsevier BV
Date: 2018
Spatial structuring of arbuscular mycorrhizal communities in benchmark and modified temperate eucalypt woodlands
Publisher: Springer Science and Business Media LLC
Date: 06-2015
DOI: 10.1007/S00572-014-0587-2
Abstract: Arbuscular mycorrhizal fungi (AMF) are crucial to the functioning of the plant-soil system, but little is known about the spatial structuring of AMF communities across landscapes modified by agriculture. AMF community composition was characterized across four sites in the highly cleared south-western Australian wheatbelt that were originally dominated by forb-rich eucalypt woodlands. Environmentally induced spatial structuring in AMF composition was examined at four scales: the regional scale associated with location, the site scale associated with past management (benchmark woodlands with no agricultural management history, livestock grazing, recent revegetation), the patch scale associated with trees and canopy gaps, and the fine scale associated with the herbaceous plant species beneath which soils were sourced. Field-collected soils were cultured in trap pots then, AMF composition was determined by identifying spores and through ITS1 sequencing. Structuring was strongest at site scales, where composition was strongly related to prior management and associated changes in soil phosphorus. The two fields were dominated by the genera Funneliformis and Paraglomus, with little convergence back to woodland composition after revegetation. The two benchmark woodlands were characterized by Ambispora gerdemannii and taxa from Gigasporaceae. Their AMF communities were strongly structured at patch scales associated with trees and gaps, in turn most strongly related to soil N. By contrast, there were few patterns at fine scales related to different herbaceous plant species, or at regional scales associated with the 175 km distance between benchmark woodlands. Important areas for future investigation are to identify the circumstances in which recolonization by woodland AMF may be limited by fungal propagule availability, reduced plant ersity and/or altered chemistry in agricultural soils.
Applied phosphorus has long-term impacts on vegetation responses in restored jarrah forest
Publisher: Australian Centre for Geomechanics, Perth
Date: 2019
Citrate and malonate increase microbial activity and alter microbial community composition in uncontaminated and diesel-contaminated soil microcosms
Publisher: Copernicus GmbH
Date: 21-09-2016
Abstract: Abstract. Petroleum hydrocarbons (PHCs) are among the most prevalent sources of environmental contamination. It has been hypothesized that plant root exudation of low molecular weight organic acid anions (carboxylates) may aid degradation of PHCs by stimulating heterotrophic microbial activity. To test their potential implication for bioremediation, we applied two commonly exuded carboxylates (citrate and malonate) to uncontaminated and diesel-contaminated microcosms (10 000 mg kg−1 aged 40 days) and determined their impact on the microbial community and PHC degradation. Every 48 h for 18 days, soil received 5 µmol g−1 of (i) citrate, (ii) malonate, (iii) citrate + malonate or (iv) water. Microbial activity was measured daily as the flux of CO2. After 18 days, changes in the microbial community were assessed by a community-level physiological profile (CLPP) and 16S rRNA bacterial community profiles determined by denaturing gradient gel electrophoresis (DGGE). Saturated PHCs remaining in the soil were assessed by gas chromatography–mass spectrometry (GC-MS). Cumulative soil respiration increased 4- to 6-fold with the addition of carboxylates, while diesel contamination resulted in a small, but similar, increase across all carboxylate treatments. The addition of carboxylates resulted in distinct changes to the microbial community in both contaminated and uncontaminated soils but only a small increase in the biodegradation of saturated PHCs as measured by the n-C17 : pristane biomarker. We conclude that while the addition of citrate and malonate had little direct effect on the biodegradation of saturated hydrocarbons present in diesel, their effect on the microbial community leads us to suggest further studies using a variety of soils and organic acids, and linked to in situ studies of plants, to investigate the role of carboxylates in microbial community dynamics.
Decomposition Studies Using Animal Models in Contrasting Environments: Evidence from Temporal Changes in Soil Chemistry and Microbial Activity
Publisher: Springer Netherlands
Date: 2009
Microbial community analysis of human decomposition on soil
Publisher: Springer Netherlands
Date: 2009
Delimiting soil chemistry thresholds for nickel hyperaccumulator plants in Sabah (Malaysia)
Publisher: Springer Science and Business Media LLC
Date: 24-02-2016
Putting the P in Ptilotus: a phosphorus-accumulating herb native to Australia
Publisher: Oxford University Press (OUP)
Date: 12-02-2009
DOI: 10.1093/AOB/MCP021
Effect of plant root symbionts on performance of native woody species in competition with an invasive grass in multispecies microcosms
Publisher: Wiley
Date: 02-08-2018
DOI: 10.1002/ECE3.4397
A novel plant-fungus symbiosis benefits the host without forming mycorrhizal structures
Publisher: Wiley
Date: 27-11-2014
DOI: 10.1111/NPH.12600
Abstract: Most terrestrial plants form mutually beneficial symbioses with specific soil‐borne fungi known as mycorrhiza. In a typical mycorrhizal association, fungal hyphae colonize plant roots, explore the soil beyond the rhizosphere and provide host plants with nutrients that might be chemically or physically inaccessible to root systems. Here, we combined nutritional, radioisotopic ( 33 P) and genetic approaches to describe a plant growth promoting symbiosis between the basidiomycete fungus Austroboletus occidentalis and jarrah ( Eucalyptus marginata ), which has quite different characteristics. We show that the fungal partner does not colonize plant roots hyphae are localized to the rhizosphere soil and vicinity and consequently do not transfer nutrients located beyond the rhizosphere. Transcript profiling of two high‐affinity phosphate (Pi) transporter genes ( Em PHT 1 and Em PHT 1 ) and hyphal‐mediated 33 Pi uptake suggest that the Pi uptake shifts from an epidermal to a hyphal pathway in ectomycorrhizal plants ( Scleroderma sp.), similar to arbuscular mycorrhizal symbioses, whereas A. occidentalis benefits its host indirectly. The enhanced rhizosphere carboxylates are linked to growth and nutritional benefits in the novel symbiosis. This work is a starting point for detailed mechanistic studies on other basidiomycete–woody plant relationships, where a continuum between heterotrophic rhizosphere fungi and plant beneficial symbioses is likely to exist.
The development of soil organic matter in restored biodiverse Jarrah forests of South-Western Australia as determined by ASE and GCMS
Publisher: Springer Science and Business Media LLC
Date: 12-02-2011
DOI: 10.1007/S11356-010-0433-9
Abstract: Soil organic matter (SOM) is known to increase with time as landscapes recover after a major disturbance however, little is known about the evolution of the chemistry of SOM in reconstructed ecosystems. In this study, we assessed the development of SOM chemistry in a chronosequence (space for time substitution) of restored Jarrah forest sites in Western Australia. Replicated s les were taken at the surface of the mineral soil as well as deeper in the profile at sites of 1, 3, 6, 9, 12, and 17 years of age. A molecular approach was developed to distinguish and quantify numerous in idual compounds in SOM. This used accelerated solvent extraction in conjunction with gas chromatography mass spectrometry. A novel multivariate statistical approach was used to assess changes in accelerated solvent extraction (ASE)-gas chromatography-mass spectrometry (GCMS) spectra. This enabled us to track SOM developmental trajectories with restoration time. Results showed total carbon concentrations approached that of native forests soils by 17 years of restoration. Using the relate protocol in PRIMER, we demonstrated an overall linear relationship with site age at both depths, indicating that changes in SOM chemistry were occurring. The surface soils were seen to approach native molecular compositions while the deeper soil retained a more stable chemical signature, suggesting litter from the developing erse plant community has altered SOM near the surface. Our new approach for assessing SOM development, combining ASE-GCMS with illuminating multivariate statistical analysis, holds great promise to more fully develop ASE for the characterisation of SOM.
Correction to: Rethinking soil water repellency and its management (Plant Ecology, (2019), 220, 10, (977-984), 10.1007/s11258-019-00967-4)
Publisher: Springer Science and Business Media LLC
Date: 03-12-2020
Organic phosphorus in the terrestrial environment: a perspective on the state of the art and future priorities
Publisher: Springer Science and Business Media LLC
Date: 06-10-2010
Seedling response to phosphate addition and inoculation with arbuscular mycorrhizas and the implications for old-field restoration in Western Australia
Publisher: Elsevier BV
Date: 09-2007
Global patterns of plant root colonization intensity by mycorrhizal fungi explained by climate and soil chemistry
Publisher: Wiley
Date: 08-01-2015
DOI: 10.1111/GEB.12272
Human Versus Animal: Contrasting Decomposition Dynamics of Mammalian Analogues in Experimental Taphonomy
Publisher: Wiley
Date: 28-03-2013
Abstract: Taphonomic studies regularly employ animal analogues for human decomposition due to ethical restrictions relating to the use of human tissue. However, the validity of using animal analogues in soil decomposition studies is still questioned. This study compared the decomposition of skeletal muscle tissues (SMTs) from human (Homo sapiens), pork (Sus scrofa), beef (Bos taurus), and lamb (Ovis aries) interred in soil microcosms. Fixed interval s les were collected from the SMT for microbial activity and mass tissue loss determination s les were also taken from the underlying soil for pH, electrical conductivity, and nutrient (potassium, phosphate, ammonium, and nitrate) analysis. The overall patterns of nutrient fluxes and chemical changes in nonhuman SMT and the underlying soil followed that of human SMT. Ovine tissue was the most similar to human tissue in many of the measured parameters. Although no single analogue was a precise predictor of human decomposition in soil, all models offered close approximations in decomposition dynamics.
Structural plasticity in root-fungal symbioses: Diverse interactions lead to improved plant fitness
Publisher: PeerJ
Date: 04-12-2018
DOI: 10.7717/PEERJ.6030
Abstract: Root-fungal symbioses such as mycorrhizas and endophytes are key components of terrestrial ecosystems. Diverse in trophy habits (obligate, facultative or hemi-biotrophs) and symbiotic relations (from mutualism to parasitism), these associations also show great variability in their root colonization and nutritional strategies. Specialized interface structures such as arbuscules and Hartig nets are formed by certain associations while others are restricted to non-specialized intercellular or intracellular hyphae in roots. In either case, there are documented ex les of active nutrient exchange, reinforcing the fact that specialized structures used to define specific mycorrhizal associations are not essential for reciprocal exchange of nutrients and plant growth promotion. In feremycorrhiza (with Austroboletus occidentalis and eucalypts), the fungal partner markedly enhances plant growth and nutrient acquisition without colonizing roots, emphasizing that a conventional focus on structural form of associations may have resulted in important functional components of rhizospheres being overlooked. In support of this viewpoint, mycobiome studies using the state-of-the-art DNA sequencing technologies have unearthed much more complexity in root-fungal relationships than those discovered using the traditional morphology-based approaches. In this review, we explore the existing literature and most recent findings surrounding structure, functioning, and ecology of root-fungal symbiosis, which highlight the fact that plant fitness can be altered by taxonomically/ecologically erse fungal symbionts regardless of root colonization and interface specialization. Furthermore, transition from saprotrophy to biotrophy seems to be a common event that occurs in erse fungal lineages (consisting of root endophytes, soil saprotrophs, wood decayers etc.), and which may be accompanied by development of specialized interface structures and/or mycorrhiza-like effects on plant growth and nutrition.
Phosphorus fertilisation and large legume species affect jarrah forest restoration after bauxite mining
Publisher: Elsevier BV
Date: 10-2015
Variation in seedling growth of 11 perennial legumes in response to phosphorus supply
Publisher: Springer Science and Business Media LLC
Date: 04-07-2010
Next generation restoration metrics: Using soil eDNA bacterial community data to measure trajectories towards rehabilitation targets
Publisher: Cold Spring Harbor Laboratory
Date: 13-08-2021
DOI: 10.1101/2021.08.12.456018
Abstract: In post-mining rehabilitation, successful mine closure planning requires specific, measurable, achievable, relevant and time-bound (SMART) completion criteria, such as returning ecological communities to match a target level of similarity to reference sites. Soil microbiota are fundamentally linked to the restoration of degraded ecosystems, helping to underpin ecological functions and plant communities. High-throughput sequencing of soil eDNA to characterise these communities offers promise to help monitor and predict ecological progress towards reference states. Here we demonstrate a novel methodology for monitoring and evaluating ecological restoration using three long-term ( 25 year) case study post-mining rehabilitation soil eDNA-based bacterial community datasets. Specifically, we developed rehabilitation trajectory assessments based on similarity to reference data from restoration chronosequence datasets. Recognising that many alternative options for microbiota data processing have potential to influence these assessments, we comprehensively examined the influence of standard versus compositional data analyses, different ecological distance measures, sequence grouping approaches, eliminating rare taxa, and the potential for excessive spatial autocorrelation to impact on results. Our approach reduces the complexity of information that often overwhelms ecologically-relevant patterns in microbiota studies, and enables prediction of recovery time, with explicit inclusion of uncertainty in assessments. We offer a step change in the development of quantitative microbiota-based SMART metrics for measuring rehabilitation success. Our approach may also have wider applications where restorative processes facilitate the shift of microbiota towards reference states.
Contrasting responses to drought stress in herbaceous perennial legumes
Publisher: Springer Science and Business Media LLC
Date: 15-07-2011
Sensitivity of jarrah (Eucalyptus marginata) to phosphate, phosphite, and arsenate pulses as influenced by fungal symbiotic associations
Publisher: Springer Science and Business Media LLC
Date: 26-01-0660
Rhizosphere 3: where plants meet soils down-under
Publisher: Springer Science and Business Media LLC
Date: 14-08-2012
Carbon trading for phosphorus gain: the balance between rhizosphere carboxylates and arbuscular mycorrhizal symbiosis in plant phosphorus acquisition
Publisher: Wiley
Date: 21-06-2012
DOI: 10.1111/J.1365-3040.2012.02547.X
Abstract: Two key plant adaptations for phosphorus (P) acquisition are carboxylate exudation into the rhizosphere and mycorrhizal symbioses. These target different soil P resources, presumably with different plant carbon costs. We examined the effect of inoculation with arbuscular mycorrhizal fungi (AMF) on amount of rhizosphere carboxylates and plant P uptake for 10 species of low-P adapted Kennedia grown for 23 weeks in low-P sand. Inoculation decreased carboxylates in some species (up to 50%), decreased plant dry weight (21%) and increased plant P content (23%). There was a positive logarithmic relationship between plant P content and the amount of rhizosphere citric acid for inoculated and uninoculated plants. Causality was indicated by experiments using sand where little citric acid was lost from the soil solution over 2 h and citric acid at low concentrations desorbed P into the soil solution. Senesced leaf P concentration was often low and P-resorption efficiencies reached >90%. In conclusion, we propose that mycorrhizally mediated resource partitioning occurred because inoculation reduced rhizosphere carboxylates, but increased plant P uptake. Hence, presumably, the proportion of plant P acquired from strongly sorbed sources decreased with inoculation, while the proportion from labile inorganic P increased. Implications for plant fitness under field conditions now require investigation.
Hydrocarbon biodegradation and soil microbial community response to repeated oil exposure
Publisher: Elsevier BV
Date: 03-2009
OzFACE: the Australian savanna free air CO2 enrichment facility and its relevance to carbon-cycling issues in a tropical savanna
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/BT04140
Abstract: A free air CO2 enrichment (FACE) facility has recently been constructed in a tropical savanna in north-eastern Queensland, Australia. The system has a novel and cost-effective design and uses an industrial source of pure CO2 piped directly to the site. We describe the design details of this facility and assess the likely contribution it will make towards advancing our understanding of the direct impacts of rising atmospheric CO2 on savannas. These include addressing uncertainties about future shifts in the tree–grass balance and associated changes in carbon stocks, responses of C4 grasses in dry tropical environments, potential sequestration of soil carbon, and the modifications of CO2 responses by moisture and nutrient interactions. Tropical regions have been poorly represented in climate change research, and the work at the OzFACE facility will complement existing and ongoing FACE studies at temperate latitudes.
Enduring effects of large legumes and phosphorus fertiliser on jarrah forest restoration 15 years after bauxite mining
Publisher: Elsevier BV
Date: 04-2019
Commensalism in an agroecosystem: hydraulic redistribution by deep-rooted legumes improves survival of a droughted shallow-rooted legume companion
Publisher: Wiley
Date: 18-01-2013
DOI: 10.1111/PPL.12020
Abstract: We investigated commensalism of water use among annual shallow-rooted and perennial deep-rooted pasture legumes by examining the effect of hydraulic lift by Cullen pallidum (N.T.Burb.) J.W.Grimes and Medicago sativa on growth, survival and nutrient uptake of Trifolium subterraneum L. A vertically split-root design allowed separate control of soil water in top and bottom soil. Thirty-five days after watering ceased in the top tube, but soil remained at field capacity in the bottom tube, an increase in shallow soil water content by hydraulic lift was 5.6 and 5.9 g kg(-1) soil overnight for C. pallidum and M. sativa, respectively. Trifolium subterraneum in this treatment maintained higher leaf water potentials (with M. sativa) or exhibited a slower decline (with C. pallidum) than without companion perennial plants and shoot biomass of T. subterraneum was 56% (with C. pallidum) and 67% (with M. sativa) of that when both top and bottom tubes were at field capacity. Uptake of rubidium (a potassium analog) and phosphorus by T. subterraneum was not facilitated by hydraulic lift. Interestingly, phosphorus content was threefold greater, and shoot biomass 1.5-3.3-fold greater when T. subterraneum was interplanted with C. pallidum compared with M. sativa, although dry weight of C. pallidum was much greater than that of M. sativa. This study showed that interplanting with deep-rooted perennial legumes has benefited the survival of T. subterraneum.
Pronounced surface stratification of soil phosphorus, potassium and sulfur under pastures upstream of a eutrophic wetland and estuarine system
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/SR16144
Abstract: High concentrations of nutrients in surface soil present a risk of nutrient movement into waterways through surface water pathways and leaching. Phosphorus (P) is of particular concern because of its role in aquatic system eutrophication. We measured nutrients under annual pastures on a beef farm and a dairy farm in the Peel–Harvey catchment, Western Australia. Soils were s led in 10-mm increments to 100mm depth in March, June and September. Plant litter contained approximately 300–550mg kg–1 Colwell-extractable P. Extractable soil P was strongly stratified, being approximately 100–225mg kg–1 (dairy) and 50–110mg kg–1 (beef) in the top 10mm and mg kg–1 at 40–50mm depth. Total P and extractable potassium were also highly stratified, whereas sulfur was less strongly stratified. Shoot nutrient concentrations indicated that nitrogen was often limiting and sulfur was sometimes limiting for pasture growth: concentrations of P were often much greater than required for adequate growth ( mg g–1). We conclude that high P concentrations at the soil surface and in litter and shoots are a source of risk for movement of P from farms into waterways in the Peel–Harvey catchment.
Mechanisms linking fungal conditioning of leaf litter to detritivore feeding activity
Publisher: Elsevier BV
Date: 02-2016
Nutrient enrichment diminishes plant diversity and density, and alters long-term ecological trajectories, in a biodiverse forest restoration
Publisher: Elsevier BV
Date: 07-2021
The benefits of fertiliser application on tree growth are transient in restored jarrah forest
Publisher: Elsevier BV
Date: 09-2021
Moderating mycorrhizas: arbuscular mycorrhizas modify rhizosphere chemistry and maintain plant phosphorus status within narrow boundaries
Publisher: Wiley
Date: 25-10-2013
DOI: 10.1111/PCE.12207
Abstract: Pastures often experience a pulse of phosphorus (P) when fertilized. We examined the role of arbuscular mycorrhizal fungi (AMF) in the uptake of P from a pulse. Five legumes (Kennedia prostrata, Cullen australasicum, Bituminaria bituminosa, Medicago sativa and Trifolium subterraneum) were grown in a moderate P, sterilized field soil, either with (+AMF) or without (-AMF) addition of unsterilized field soil. After 9-10 weeks, half the pots received 15 mg P kg(-1) of soil. One week later, we measured: shoot and root dry weights percentage of root length colonized by AMF plant P, nitrogen and manganese (Mn) concentrations and rhizosphere carboxylates, pH and plant-available P. The P pulse raised root P concentration by a similar amount in uncolonized and colonized plants, but shoot P concentration increased by 143% in uncolonized plants and 53% in colonized plants. Inoculation with AMF decreased the amount of rhizosphere carboxylates by 52%, raised rhizosphere pH by ∼0.2-0.7 pH units and lowered shoot Mn concentration by 38%. We conclude that AMF are not simply a means for plants to enhance P uptake when P is limiting, but also act to maintain shoot P within narrow boundaries and can affect nutrient uptake through their influence on rhizosphere chemistry.
Ecto- and arbuscular mycorrhizal symbiosis can induce tolerance to toxic pulses of phosphorus in jarrah (Eucalyptus marginata) seedlings
Publisher: Springer Science and Business Media LLC
Date: 02-03-2014
Dual mycorrhizal associations of jarrah (Eucalyptus marginata) in a nurse-pot system
Publisher: CSIRO Publishing
Date: 2012
DOI: 10.1071/BT12152
Abstract: Jarrah (Eucalyptus marginata Donn ex Sm.) plants, like many other eucalypts, can form symbiotic associations with both arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) fungi. To study this tripartite relationship we developed a novel nurse-pot system to allow us to investigate the extent and temporal colonisation dynamics of jarrah by two AM species (Rhizophagus irregularis (Błaszk., Wubet, Renker & Buscot) C. Walker & A. Schüßler comb. nov. and Scutellospora calospora Nicol. & Gerd.) and two putative ECM species (Austroboletus occidentalis Watling & N.M. Greg. and Scleroderma sp.) and their potential effects on jarrah growth and nutrition. Our nurse-pot system, using jarrah as both the nurse plant and test plant, was developed to establish extraradical hyphal networks of both AM and ECM fungi that act as single or dual inoculum for test plants. Mycorrhizal colonisation was described and quantified, and growth and nutritional effects measured and analysed. Mycorrhizal colonisation increased with time for the test seedlings exposed to hyphae networks from S. calospora and Scleroderma sp. The nurse-pot system was effective at initiating colonisation of functioning AM or (putative) ECM systems separately but the ECM symbiosis was inhibited where a dual AM + ECM inoculum (R. irregularis and Scleroderma sp.) was present. The presence of S. calospora, A. occidentalis and Scleroderma sp. in idually significantly increased the shoot biomass of seedlings compared with non-mycorrhizal controls. The two AM isolates had different physiological effects on jarrah plants. S. calospora improved growth and micronutrient uptake of jarrah seedlings whereas no positive response was observed with R. irregularis. In addition, as an interesting observation, the non-responsive AM fungus R. irregularis suppressed the ECM symbiosis in dually inoculated plants where ECM structures, positive growth response and nutritional effects were absent. When inoculated in idually, ECM isolates dominated the growth response and uptake of P and other nutrients in this dual symbiotic plant. Despite the positive growth response in the A. occidentalis treatment, ECM structures were not observed in either nurse or test seedlings. From the effects of A. occidentalis on jarrah we hypothesise that this fungus forms a functional mycorrhizal-type partnership even without forming archetypal structures in and on the root.
Do arbuscular mycorrhizas or heterotrophic soil microbes contribute toward plant acquisition of a pulse of mineral phosphate?
Publisher: Springer Science and Business Media LLC
Date: 20-07-2013
Phosphorus dynamics in a tropical forest soil restored after strip mining
Publisher: Springer Science and Business Media LLC
Date: 23-05-2018
Terrestrial exposure of oilfield flowline additives diminish soil structural stability and remediative microbial function
Publisher: Elsevier BV
Date: 10-2011
DOI: 10.1016/J.ENVPOL.2011.05.023
Abstract: Onshore oil production pipelines are major installations in the petroleum industry, stretching many thousands of kilometres worldwide which also contain flowline additives. The current study focuses on the effect of the flowline additives on soil physico-chemical and biological properties and quantified the impact using resilience and resistance indices. Our findings are the first to highlight deleterious effect of flowline additives by altering some fundamental soil properties, including a complete loss of structural integrity of the impacted soil and a reduced capacity to degrade hydrocarbons mainly due to: (i) phosphonate salts (in scale inhibitor) prevented accumulation of scale in pipelines but also disrupted soil physical structure (ii) glutaraldehyde (in biocides) which repressed microbial activity in the pipeline and reduced hydrocarbon degradation in soil upon environmental exposure (iii) the combinatory effects of these two chemicals synergistically caused severe soil structural collapse and disruption of microbial degradation of petroleum hydrocarbons.
Celebrating 60 years of
Publisher: CSIRO Publishing
Date: 14-11-2022
DOI: 10.1071/SR22223
Abstract: An editorial to celebrate the 60th anniversary of the Soil Research journal.
Rethinking soil water repellency and its management
Publisher: Springer Science and Business Media LLC
Date: 29-08-2019
The where, when and what of phosphorus fertilisation for seedling establishment in a biodiverse jarrah forest restoration after bauxite mining in Western Australia
Publisher: Elsevier BV
Date: 06-2020
Soil phosphorus supply affects nodulation and N:P ratio in 11 perennial legume seedlings
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/CP11229
Abstract: Developing new perennial pasture legumes for low-P soils is a priority for Australian Mediterranean agro-ecosystems, where soil P availability is naturally low. As legumes tend to require higher P inputs than non-legumes, the ability of these plants to fix N2 under varying soil P levels must be determined. Therefore, the objective of this study was to investigate the influence of soil P supply on plant N status and nodule formation in 11 perennial legumes, including some novel pasture species. We investigated the effect of applying soil P, ranging from 0 to 384 μg P/g dry soil, on plant N status and nodulation in a glasshouse. Without exogenous P supply, shoot N concentration and N : P ratio were higher than at 6 μg P/g soil. Shoot N concentration and N : P ratio then changed little with further increase in P supply. There was a close positive correlation between the number of nodules and shoot P concentration in 7 of the 11 species. Total nodule dry weight and the percentage of plant dry weight that consisted of nodules increased when P supply increased from 6 to 48 μg P/g. Without exogenous P addition, N : P ratios partitioned into a two-group distribution, with species having a N : P ratio of either or g/g. We suggest that plants with a high N : P ratio may take up N from the soil constitutively, while those with a low N : P ratio may regulate their N uptake in relation to internal P concentration. The flexibility of the novel pasture legumes in this study to adjust their leaf N concentrations under different levels of soil P supplements other published evidence of good growth and high P uptake and P-use efficiency under low soil P supply and suggests their potential as pasture plants in low-P soils in Australian Mediterranean agro-ecosystems warrants further attention.
Sequential hydrocarbon biodegradation in a soil from arid coastal Australia, treated with oil under laboratory controlled conditions
Publisher: Elsevier BV
Date: 09-2008
Root distributions of Australian herbaceous perennial legumes in response to phosphorus placement
Publisher: CSIRO Publishing
Date: 2006
DOI: 10.1071/FP06176
Abstract: Many Australian plant species have specific root adaptations for growth in phosphorus-impoverished soils, and are often sensitive to high external P concentrations. The growth responses of native Australian legumes in agricultural soils with elevated P availability in the surface horizons are unknown. The aim of these experiments was to test the hypothesis that increased P concentration in surface soil would reduce root proliferation at depth in native legumes. The effect of P placement on root distribution was assessed for two Australian legumes, Kennedia prorepens F. Muell. and Lotus australis Andrews, and the exotic Medicago sativa L. Three treatments were established in a low-P loam soil: amendment of 0.15 g mono-calcium phosphate in either (i) the top 50 mm (120 µg P g–1) or (ii) the top 500 mm (12 µg P g–1) of soil, and an unamended control. In the unamended soil M. sativa was shallow rooted, with 58% of the root length of in the top 50 mm. K. prorepens and L. australis had a more even distribution down the pot length, with only 4 and 22% of their roots in the 0–50 mm pot section, respectively. When exposed to amendment of P in the top 50 mm, root length in the top 50 mm increased 4-fold for K. prorepens and 10-fold for M. sativa, although the pattern of root distribution did not change for M. sativa. L. australis was relatively unresponsive to P additions and had an even distribution of roots down the pot. Shoot P concentrations differed according to species but not treatment (K. prorepens 2.1 mg g–1, L. australis 2.4 mg g–1, M. sativa 3.2 mg g–1). Total shoot P content was higher for K. prorepens than for the other species in all treatments. In a second experiment, mono-ester phosphatases were analysed from 1-mm slices of soil collected directly adjacent to the rhizosphere. All species exuded phosphatases into the rhizosphere, but addition of P to soil reduced phosphatase activity only for K. prorepens. Overall, high P concentration in the surface soil altered root distribution, but did not reduce root proliferation at depth. Furthermore, the Australian herbaceous perennial legumes had root distributions that enhanced P acquisition from low-P soils.
Just Add Water and Salt: the Optimisation of Petrogenic Hydrocarbon Biodegradation in Soils from Semi-arid Barrow Island, Western Australia
Publisher: Springer Science and Business Media LLC
Date: 18-08-2010
Rooting theories of plant community ecology in microbial interactions
Publisher: Elsevier BV
Date: 08-2010
Physiological and morphological adaptations of herbaceous perennial legumes allow differential access to sources of varyingly soluble phosphate
Publisher: Wiley
Date: 08-11-2015
DOI: 10.1111/PPL.12297
Abstract: The aim of this study was to investigate the capacity of three perennial legume species to access sources of varyingly soluble phosphorus (P) and their associated morphological and physiological adaptations. Two Australian native legumes with pasture potential (Cullen australasicum and Kennedia prostrata) and Medicago sativa cv. SARDI 10 were grown in sand under two P levels (6 and 40 µg P g(-1) ) supplied as Ca(H2 PO4 )2 ·H2 O (Ca-P, highly soluble, used in many fertilizers) or as one of three sparingly soluble forms: Ca10 (OH)2 (PO4 )6 (apatite-P, found in relatively young soils major constituent of rock phosphate), C6 H6 O24 P6 Na12 (inositol-P, the most common form of organic P in soil) and FePO4 (Fe-P, a poorly-available inorganic source of P). All species grew well with soluble P. When 6 µg P g(-1) was supplied as sparingly soluble P, plant dry weight (DW) and P uptake were very low for C. australasicum and M. sativa (0.1-0.4 g DW) with the exception of M. sativa supplied with apatite-P (1.5 g). In contrast, K. prostrata grew well with inositol-P (1.0 g) and Fe-P (0.7 g), and even better with apatite-P (1.7 g), similar to that with Ca-P (1.9 g). Phosphorus uptake at 6 µg P g(-1) was highly correlated with total root length, total rhizosphere carboxylate content and total rhizosphere acid phosphatase (EC 3.1.3.2) activity. These findings provide strong indications that there are opportunities to utilize local Australian legumes in low P pasture systems to access sparingly soluble soil P and increase perennial legume productivity, ersity and sustainability.
Soil conditioning and plant-soil feedbacks in a modified forest ecosystem are soil-context dependent
Publisher: Springer Science and Business Media LLC
Date: 28-01-2015
Related Organisations
No related organisations have been discovered for Mark Tibbett.
Related Funding Activities
Linkage Projects - Grant ID: LP0668380
Start Date: 03-2006
End Date: 03-2009
Amount: $225,834.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0669515
Start Date: 12-2006
End Date: 12-2009
Amount: $239,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP110200961
Start Date: 10-2011
End Date: 03-2015
Amount: $300,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE0989071
Start Date: 01-2009
End Date: 07-2012
Amount: $600,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0668931
Start Date: 09-2006
End Date: 12-2010
Amount: $337,296.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE0775650
Start Date: 2007
End Date: 12-2008
Amount: $170,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP110201130
Start Date: 06-2012
End Date: 12-2015
Amount: $419,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP120200808
Start Date: 01-2013
End Date: 12-2015
Amount: $390,000.00
Funder: Australian Research Council
View Funded Activity