A5075693696- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Plant responses to water stress
- Hydrology and Sediment Transport Processes
- Plant Diversity and Evolution
- Plant and animal studies
- Horticultural and Viticultural Research
- Irrigation Practices and Water Management
- Coastal wetland ecosystem dynamics
- Tree Root and Stability Studies
- Cephalopods and Marine Biology
- Terahertz technology and applications
- Plant Parasitism and Resistance
- Peatlands and Wetlands Ecology
- Plant Reproductive Biology
- Entomological Studies and Ecology
- Plant and Fungal Species Descriptions
- Flood Risk Assessment and Management
- Leaf Properties and Growth Measurement
- Economic and Environmental Valuation
- Ecology and Vegetation Dynamics Studies
- Constructed Wetlands for Wastewater Treatment
- Rangeland Management and Livestock Ecology
- Plant responses to elevated CO2
Western Sydney University
2017-2024
Oak Ridge National Laboratory
2020-2024
University of York
2008
Leaf water potential (ψ
Abstract The iso/anisohydric continuum describes how plants regulate leaf water potential and is commonly used to classify species drought response strategies. However, strategies comprise more than just this continuum, incorporating a suite of stomatal hydraulic traits. Using common garden experiment, we compared contrasted four metrics describe use strategy during in 10 eucalyptus comprising major ecosystems eastern Australia. We examined the degree which these were aligned with key traits...
Abstract Globally, forests are facing an increasing risk of mass tree mortality events associated with extreme droughts and higher temperatures. Hydraulic dysfunction is considered a key mechanism drought‐triggered dieback. By leveraging the climate breadth Australian landscape national network research sites (Terrestrial Ecosystem Research Network), we conducted continental‐scale study physiological hydraulic traits 33 native species from contrasting environments to disentangle complexities...
Abstract The mechanisms by which woody plants recover xylem hydraulic capacity after drought stress are not well understood, particularly with regard to the role of embolism refilling. We evaluated recovery in young Eucalyptus saligna exposed cycles and rewatering. Plants were moderate severe treatments, monitored at time intervals from 24 h 6 months percentage loss vessels due (PLV) was quantified each point using microcomputed tomography stem water potential (Ψ x ) canopy transpiration ( E...
Plant hydraulic traits influence the capacity of species to grow and survive in water-limited environments, but their comparative study at a common site has been limited. The primary aim this was determine whether selective pressures on originating drought-prone environments constrain among related grown under conditions.Leaf tissue water relations, xylem anatomy, stomatal behaviour vulnerability drought-induced embolism were measured six Eucalyptus growing garden these current climate range...
X-ray microtomography (microCT) is becoming a valuable noninvasive tool for advancing our understanding of plant-water relations. Laboratory-based microCT systems are more affordable and provide better access than synchrotron facilities. However, some come at the cost comparably lower signal quality spatial resolution In this study, we evaluated laboratory-based imaging as to nondestructively analyse hydraulic vulnerability drought-induced embolism in woody plant species. We analysed...
Land-use intensification is a central element in proposed strategies to address global food security. One rationale for accepting the negative consequences of land-use farmland biodiversity that it could 'spare' further expansion agriculture into remaining natural habitats. However, many regions world only habitats can be spared are fragments within landscapes dominated by agriculture. Therefore, land-sparing arguments hinge on having low spillover effects adjacent protected areas, otherwise...
Drought stress can result in significant impairment of the plant hydraulic system via blockage xylem conduits by gas emboli. Recovery after drought is an essential component survival but still a poorly understood process. In this study, we examined capacity woody species from two genera (Eucalyptus and Quercus) to refill embolized vessels during cycle recovery. Observations were made on intact plants Eucalyptus calmudulensis, E. grandis, saligna Quercus palustris using X-ray microtomography....
Summary Hydraulic failure of the plant vascular system is a principal cause forest die‐off under drought. Accurate quantification this process essential to our understanding physiological mechanisms underpinning mortality. Imaging techniques increasingly are applied estimate xylem cavitation resistance. These allow for in situ measurement embolism formation real time, although benefits and trade‐offs associated with different have not been evaluated detail. Here we compare two imaging...
Vapour pressure deficit (D) is projected to increase in the future as temperature rises. In response increased D, stomatal conductance (gs) and photosynthesis (A) are reduced, which may result significant reductions terrestrial carbon, water energy fluxes. It thus important for gas exchange models capture observed responses of gs A with increasing D. We tested a series coupled A-gs against leaf measurements from Cumberland Plain Woodland (Australia), where D regularly exceeds 2 kPa can reach...
Abstract In this paper we describe a non-invasive method of measuring leaf water content using THz radiation and combine with psychrometry for determination pressure–volume relationships. contrast to prior investigations measure plant status, the reported exploits differential absorption characteristic at multiple frequencies within leaves determine absolute in real-time. By combining system psychrometer, curves were generated completely automated fashion tissue relations parameters...
Abstract Increasing severity and frequency of drought is predicted for large portions the terrestrial biosphere, with major impacts already documented in wet tropical forests. Using a 4‐year rainfall exclusion experiment Daintree Rainforest northeast Australia, we examined canopy tree responses to reduced precipitation soil water availability by quantifying seasonal changes plant hydraulic carbon traits 11 species between control treatments. Even volumetric content upper 1 m treatment, found...
Root vulnerability to cavitation is challenging measure and under-represented in current datasets. This gap limits the precision of models used predict plant responses drought because roots comprise critical interface between soil. In this study, we measured drought-induced woody stems five tree species (Acacia aneura, Cedrus deodara, Eucalyptus crebra, Eucalytus saligna, Quercus palustris) with a wide range xylem anatomies. X-ray microtomography was visualize accumulation embolism intact...
Mistletoes are important co-contributors to tree mortality globally, particularly during droughts. In Australia, mistletoe distributions expanding in temperate woodlands, while their hosts have experienced unprecedented heat and drought stress recent years. We investigated whether the excessive water use of mistletoes increased probability xylem emboli a mature woodland record that was compounded by multiple heatwaves. continuously recorded transpiration ($T_{SLA}$) infected uninfected...
Selecting suitable nature reserves is a continuing challenge in conservation, particularly for target groups that are time-consuming to survey, species rich, and extinction prone. One such group the parasitoid Hymenoptera, which have been excluded from conservation planning. If basic characteristics of habitats or vegetation could be used as reliable surrogates specific taxa, this would greatly facilitate appropriate reserve selection. We identified range potential habitat indicators...
Plant hydraulic theory states that leaf and stem vulnerability to embolism is coordinated within individual plants. The segmentation hypothesis (HVSH) predicts higher in leaves protect the from failure, preserving xylem, which generally more metabolically expensive slower regenerate than tissues. However, studies designed test HVSH have reported wide ranges (VS), patterns with environment been elusive. In this study, we tested phylogenetically constrained tree species contrasting ecosystems...
The mechanisms by which woody plants recover xylem hydraulic capacity after drought stress are not well understood, particularly with regard to the role of embolism refilling. We evaluated recovery in young Eucalyptus saligna exposed cycles and rewatering. Plants were moderate severe treatments, monitored at time intervals from 24 hrs 6 months percentage loss vessels due (PLV) was quantified each point using micro-computed tomography stem water potential (Ψx) whole plant transpiration...