A5024075992- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Hydrology and Watershed Management Studies
- Ecology and Vegetation Dynamics Studies
- Plant responses to elevated CO2
- Forest Management and Policy
- Agroforestry and silvopastoral systems
- Fire effects on ecosystems
- Hydrology and Sediment Transport Processes
- Conservation, Biodiversity, and Resource Management
- Economic and Environmental Valuation
- Environmental Conservation and Management
- Climate variability and models
- Horticultural and Viticultural Research
- Forest Insect Ecology and Management
- Irrigation Practices and Water Management
- Groundwater and Watershed Analysis
- Land Use and Ecosystem Services
- Plant and animal studies
- Soil and Unsaturated Flow
- Pasture and Agricultural Systems
- Plant responses to water stress
- Hydrology and Drought Analysis
- Mining and Resource Management
Commonwealth Scientific and Industrial Research Organisation
2011-2025
CSIRO Oceans and Atmosphere
2024
Health Sciences and Nutrition
2012-2024
Royal Berkshire NHS Foundation Trust
2024
CSIRO Land and Water
2014-2022
University of Tasmania
2006-2022
Ecosystem Sciences
2010-2016
Forestry Tasmania
2005-2013
Forestry Research Centre
2011
Government of the Northern Territory
2001
Summary Plant survival during drought requires adequate hydration in living tissues and carbohydrate reserves for maintenance recovery. We hypothesized that tree growth hydraulic strategy determines the intensity duration of ‘physiological drought’, thereby affecting relative contributions loss function depletion mortality. compared patterns rate, water relations, gas exchange dynamics three species subjected to prolonged drought. Two E ucalyptus ( . globulus , smithii ) exhibited high rates...
Understanding how plants are constructed—i.e., key size dimensions and the amount of mass invested in different tissues varies among individuals—is essential for modeling plant growth, carbon stocks, energy fluxes terrestrial biosphere. Allocation patterns can differ through ontogeny, but also coexisting species adapted to environments. While a variety models dealing with biomass allocation exist, we lack synthetic understanding underlying processes. This is partly due suitable data sets...
Australian savannas exhibit marked seasonality in precipitation, with more than 90% of the annual total falling between October and May. The dry season is characterized by declining soil water availability high vapor pressure deficits (up to 2.5 kPa). We used heat pulse technology measure whole-tree transpiration rates on a daily seasonal basis for two dominant eucalypts at site near Darwin, Australia. Contrary expectations, were higher during wet season, largely because increased...
Abstract Accurate ground‐based estimation of the carbon stored in terrestrial ecosystems is critical to quantifying global budget. Allometric models provide cost‐effective methods for biomass prediction. But do such vary with ecoregion or plant functional type? We compiled 15 054 measurements individual tree shrub from across Australia examine generality allometric above‐ground This provided a robust case study because includes ecoregions ranging arid shrublands tropical rainforests, and has...
Increases in drought and temperature stress forest woodland ecosystems are thought to be responsible for the rise episodic mortality events observed globally. However, key climatic drivers common impacts of future extreme droughts on tree survival have not been evaluated. Here, we characterize associated with documented die-off across Australia using standardized indices represent dimensions a range vegetation types. We identify probabilistic threshold an increased risk all sites that...
Drought-induced tree mortality alters forest structure and function, yet our ability to predict when how different species die during drought remains limited. Here, we explore stomatal control tolerance traits influence the duration of stress leading critical levels hydraulic failure. We examined growth physiological responses four woody plant (three angiosperms one conifer) representing a range water-use over course two controlled drought-recovery cycles followed by an extended dry-down. At...
Gas exchange, growth, water transport and carbon (C) metabolism diminish during drought according to their respective sensitivities declining status. The timing of this sequence physiological functions may determine how C relations compromise plant survival. In paper, we test the hypothesis that degree asynchrony between supply (photosynthesis) demand (growth respiration) determines rate magnitude changes in whole-plant non-structural carbohydrates (NSC) drought. Two complementary...
It has been reported that elevated temperature accelerates the time-to-mortality in plants exposed to prolonged drought, while [CO(2)] acts as a mitigating factor because it can reduce stomatal conductance and thereby water loss. We examined interactive effects of on inter-dependent carbon hydraulic characteristics associated with drought-induced mortality Eucalyptus radiata seedlings grown two (400 640 μL L(-1)) (ambient ambient +4 °C) treatments. Seedlings were controlled drying rewatering...
Elevated [CO2] and temperature may alter the drought responses of tree seedling growth, photosynthesis, respiration total non-structural carbohydrate (TNC) status depending on intensity duration. Few studies have addressed these important climatic interactions or their consequences. We grew Eucalyptus globulus Labill. seedlings in two concentrations (400 640 μl l(-1)) temperatures (28/17 32/21 °C) (day/night) a sun-lit glasshouse, them well-watered conditions exposed to treatments having...
Summary Rising levels of atmospheric CO 2 concentration ( C a ) and simultaneous climate change profoundly affect plant physiological performance while challenging our ability to estimate vegetation–atmosphere fluxes. To predict rates water carbon exchange between vegetation the atmosphere, we require formulation for stomatal conductance g s that captures multidimensional response stomata changing environmental conditions. The unified optimization (USO) theory provides with novel conditions...
Substantial uncertainty surrounds our knowledge of tree stem growth, with some the most basic questions, such as when radial growth occurs through daily cycle, still unanswered. We employed high-resolution point dendrometers, sap flow sensors, and developed theory statistical approaches, to devise a novel method separating irreversible from elastic tension-driven osmotically driven changes in bark water content. tested this using data five case study species. Experimental manipulations,...
Abstract Purpose To report the 2-year follow-up of patients with mild-to-moderate knee osteoarthritis (OA) treated genicular artery embolisation (GAE) as part GENESIS study. Materials and methods Forty-six patients, median age = 60 (45–83) underwent GAE using permanent microspheres (100–300 μm). Technical success was defined targeted arteries. Knee Injury Osteoarthritis Outcome Score (KOOS) Visual Analogue Scale (VAS) (0–100 mm) were recorded at baseline, 6 weeks, 3 months, 1, 2 years....
Abstract 1. Using three independent methods (eddy covariance, heat pulse and open‐top chambers), diurnal seasonal measurements of evapotranspiration were made in a wet–dry Eucalypt savanna the Northern Territory, Australia. 2. Total annual dry‐canopy water loss was estimated to be 870 mm understorey contributed 557 this flux. Understorey occurred predominantly during wet season as bare soil evaporation transpiration Sorghum spp., C 4 grass. 3. Annual from trees 313 mm, significantly less...
Daily and seasonal fluxes of carbon dioxide water vapor above a north Australian savanna were recorded over complete dry season–wet season annual cycle using the eddy covariance technique. Wet rates photosynthesis transpiration larger than those measured in dominated by presence grassy understory. As progressed grass understory died, ecosystem assimilation flux declined substantially. By end season, canopy evapotranspiration 20–25% wet values. Assimilation was light saturated but not season....
Climate change is expected to increase both pest insect damage and the occurrence of severe drought. There therefore a need better understand combined effects biotic abiotic on tree growth in order predict multi-factorial effect climate forest ecosystem productivity. Indeed, stress interactions an increasingly important topic that greatly lacks experiments data, it unlikely impact stresses can be extrapolated from outcomes studies focused single stress. We developed original manipulative...
The surge in global efforts to understand the causes and consequences of drought on forest ecosystems has tended focus specific impacts such as mortality. We propose an ecoclimatic framework that takes a broader view ecological relevance water deficits, linking elements exposure resilience cumulative range ecosystem processes. This is underpinned by two hypotheses: (i) deficit can be represented probabilistically used estimate thresholds across different vegetation types or ecosystems; (ii)...
Future climate regimes characterized by rising [CO2], temperatures and associated droughts may differentially affect tree growth physiology. However, the interactive effects of these three factors are complex because elevated [CO2] temperature generate differential physiological responses during drought. To date, on drought-induced mortality remain poorly understood in gymnosperm species that differ stomatal regulation strategies. Water relations carbon dynamics were examined two with...
Savanna communities dominate the wet–dry tropical regions of world and are an important community type in monsoonal northern Australia. As such they have a significant impact on water carbon balance this region. Above 1200-mm isohyet, savanna’s dominated by Eucalyptus miniata–E. tetrodonta open forests. We described detail composition structure as well seasonal patterns leaf area index above-ground biomass E. forests Gunn Point region near Darwin Northern Territory In all, 29 tree species...