A5056969781- 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
- Soil and Unsaturated Flow
- Climate variability and models
- Fire effects on ecosystems
- Species Distribution and Climate Change
- Plant responses to water stress
- Forest Insect Ecology and Management
- Soil Carbon and Nitrogen Dynamics
- Remote Sensing in Agriculture
- Soil erosion and sediment transport
- Healthcare innovation and challenges
- Horticultural and Viticultural Research
- Pasture and Agricultural Systems
- Landslides and related hazards
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Sediment Transport Processes
- Neurogenetic and Muscular Disorders Research
- demographic modeling and climate adaptation
- Leaf Properties and Growth Measurement
- Rangeland and Wildlife Management
Macquarie University
2013-2023
The University of Sydney
2009-2017
University of Technology Sydney
2003-2011
National Centre for Groundwater Research and Training
2010
CO2CRC
2006-2007
Australian National University
2006
Japan External Trade Organization
2005
Abstract. The global hydrological cycle is predicted to become more intense in future climates, with both larger precipitation events and longer times between some regions. Redistribution of may occur within across seasons, the resulting wide fluctuations soil water content (SWC) dramatically affect plants. Though these responses remain poorly understood, recent research this emerging field suggests effects redistributed differ from predictions based on previous drought studies. We review...
Abstract Accurately quantifying evapotranspiration (ET) is essential for modelling regional‐scale ecosystem water balances. This study assembled an ET data set estimated from eddy flux and sapflow measurements 13 ecosystems across a large climatic management gradient the United States, China, Australia. Our objectives were to determine relationships among monthly measured actual (ET), calculated FAO‐56 grass reference (ET o ), precipitation ( P leaf area index (LAI)—one associated key...
Abstract Climate change is highly likely to impact on forest productivity over the next century. The direction and magnitude of are uncertain because many factors changing simultaneously, such as atmospheric composition, temperature, rainfall, land use. Simulation models have been widely used estimate how these interacting might combine alter productivity. Such studies different types with underlying assumptions. To evaluate predictions made by studies, it essential understand type model...
Sudden and widespread forest die-back die-off (e.g. Huang & Anderegg, 2012) increased mortality rates Peng et al., 2011) in many ecosystems across the globe have been linked to drought elevated temperatures (Allen 2010; Fig. 1). These observations caused a focus on physiological mechanisms of drought-induced tree McDowell 2008) studies, both observational manipulative, carried out explain death during from perspective (see Table 1 for examples). While it can be difficult extract common...
Abstract Relatively anisohydric species are predicted to be more predisposed hydraulic failure than relatively isohydric species, as they operate with narrower safety margins. We subjected co‐occurring J uniperus monosperma and P inus edulis trees warming, reduced precipitation, or both, measured their gas exchange responses. found that reductions in stomatal conductance assimilation by heat drought were frequent during moist periods, but these effects not exacerbated the combined treatment....
• The response of nocturnal stomatal conductance (gs,n) to rising atmospheric CO2 concentration ([CO2]) is currently unknown, and may differ from responses daytime (gs,d). Because night-time water fluxes can have a significant impact on landscape budgets, an understanding the effects [CO2] temperature gs,n crucial for predicting under future climates. Here, we examined (280, 400 640 μmol mol−1), (ambient ambient + 4°C) drought gs,n, gs,d in Eucalyptus sideroxylon saplings. g s,n was...
Xylem sap velocity of two dominant tree species, Eucalyptus crebra F. Muell. and Callitris glaucophylla J. Thompson & L.A.S. Johnson, in a native remnant forest eastern Australia was measured winter summer during prolonged (> 12 months) extensive drought. The influence vapour pressure deficit (VPD) solar radiation levels on the determined. Pronounced hysteresis observed both species as function VPD radiation. However, rotation curve clockwise for response to but anti-clockwise levels. A...
Nocturnal fluxes may be a significant factor in the annual water budget of forested ecosystems. Here, we assessed sap flow two co-occurring evergreen species (Eucalyptus parramattensis and Angophora bakeri) temperate woodland for 2 years order to quantify magnitude seasonal nocturnal (En) under different environmental conditions. The showed diurnal relations, demonstrated by curves stomatal conductance, leaf potential. relative influence several microclimatic variables, including wind speed...
Daily and seasonal patterns of tree water use were measured for the two dominant species, Angophora bakeri E.C.Hall (narrow-leaved apple) Eucalyptus sclerophylla (Blakely) L.A.S. Johnson & Blaxell (scribbly gum), in a temperate, open, evergreen woodland using sap flow sensors, along with information about soil, leaf, micro-climatological variables. The aims this work to: (a) validate soil-plant-atmosphere (SPA) model specific site; (b) determine total depth from which uptake must occur to...
Abstract Broad‐scale forest die‐off associated with drought and heat has now been reported from every forested continent, posing a global‐scale challenge to management. Climate‐driven is frequently compounded other drivers of tree mortality, such as altered land use, wildfire, invasive species, making management increasingly complex. Facing similar challenges, rangeland managers have widely adopted the approach developing conceptual models that identify key ecosystem states major types...
Abstract. The terrestrial biosphere regulates climate through carbon, water, and energy exchanges with the atmosphere. Land-surface models estimate plant transpiration, which is actively regulated by stomatal pores, provide projections essential for understanding Earth's carbon water resources. Empirical evidence from 204 species suggests that significant amounts of are lost leaves at night, though land-surface typically reduce conductance to nearly zero night. Here, we test sensitivity...
Childhood cancer can have short- and long-term impacts on parents' finances employment. It is important to understand how families adjust the financial employment changes caused by childhood cancer, ongoing after treatment completion, which need more targeted support. Qualitative research necessary facilitate an in-depth understanding of capture complex nuanced experiences perspectives.We interviewed 56 parents survivors (M = 2.13 years completion; 89% mothers) using vocational impact...
Leaf area index (LAI) is one of the most important variables required for modelling growth and water use forests. Functional–structural plant models these to represent physiological processes in 3-D tree representations. Accuracy depends on accurate estimation LAI at stand scales validation purposes. A recent method estimate from digital images (LAID) uses image capture gap fraction analysis (Macfarlane et al. 2007b) upward-looking photographs canopy LAID (cover photography). After...
Abstract A soil–plant–atmosphere model was used to estimate gross primary productivity (GPP) and evapotranspiration (ET) of a tropical savanna in Australia. This paper describes modifications required simulate the substantial C4 grass understory together with C3 trees. The further improved include seasonal distribution leaf area foliar nitrogen through 10 canopy layers. Model outputs were compared 5‐year eddy covariance dataset. Adding photosynthesis component efficiency root‐mean‐squared...
Abstract A modified Jarvis–Stewart model of canopy transpiration ( E c ) was tested over five ecosystems differing in climate, soil type and species composition. The aims this study were to investigate the model's applicability multiple ecosystems; determine whether number parameters could be reduced by assuming that site‐specific responses solar radiation, vapour pressure deficit moisture content vary little between sites; examine convergence behaviour water‐use across sites. This...