Maceo Carrillo Martinet, Enrique R. Vivoni, James Cleverly, J. R. Thibault, Jennifer F. Schuetz, Clifford N. Dahm,
This study utilizes 7 years of continuously monitored groundwater‐level data from four sites along the Río Grande riparian corridor in central New Mexico to calculate evapotranspiration from groundwater and assess impacts of understory vegetation removal during a restoration project. Diurnal groundwater fluctuation measurements were used to compare the well‐known White method for estimating evapotranspiration from groundwater ( ET g ) to colocated measurements of total riparian evapotranspiration ( ET ) ...
Tópico(s): Plant Water Relations and Carbon Dynamics
2009 - Wiley | Water Resources Research
James Cleverly, Clifford N. Dahm, J. R. Thibault, David Gilroy, Julie Coonrod,
Tópico(s): Hydrology and Watershed Management Studies
2002 - Elsevier BV | Journal of Arid Environments
Clifford N. Dahm, James Cleverly, Julia E. Allred Coonrod, J. R. Thibault, D. E. McDonnell, David Gilroy,
1. Evapotranspiration (ET) is a major source of water depletion from riverine systems in arid and semiarid climates. Water budgets have produced estimates of total depletions from riparian vegetation ET for a 320‐km reach of the Middle Rio Grande, New Mexico, U.S.A., that have ranged from 20 to 50% of total depletions from the river. 2. Tower‐based micrometeorological measurements of riparian zone ET throughout the growing season using three‐dimensional eddy covariance provided high quality estimates ...
Tópico(s): Hydrology and Sediment Transport Processes
2002 - Wiley | Freshwater Biology
Georgianne W. Moore, James Cleverly, M. K. Owens,
Tamarix chinensis Lour., which is common throughout the southwestern USA, is a phreatophytic riparian tree capable of high water use. We investigated temporal congruence between daily total evapotranspiration (E) estimated from stem sap flux (Js) measurements (Esf) and eddy covariance (Ecv), both seasonally and immediately following rain events, and used measurements of leaf-level gas exchange, stem water content and diurnal changes in leaf water potential to track drivers of transpiration. In one study, ...
Tópico(s): Hydrology and Sediment Transport Processes
2008 - Oxford University Press | Tree Physiology
James Cleverly, Clifford N. Dahm, J. R. Thibault, D. E. McDonnell, Julie Coonrod,
Abstract During the previous decade, the south‐western United States has faced declining water resources and escalating forest fires due to long‐term regional drought. Competing demands for water resources require a careful accounting of the basin water budget. Water lost to the atmosphere through riparian evapotranspiration (ET) is believed to rank in the top third of water budget depletions. To better manage depletions in a large river system, patterns of riparian ET must be better understood. ...
Tópico(s): Hydrology and Watershed Management Studies
2006 - Wiley | Hydrological Processes
Pamela L. Nagler, Russell L. Scott, Craig L. Westenburg, James Cleverly, Ed Glenn, Alfredo Huete,
We combined remote sensing and in-situ measurements to estimate evapotranspiration (ET) from riparian vegetation over large reaches of western U.S. rivers and ET by individual plant types. ET measured from nine flux towers (eddy covariance and Bowen ratio) established in plant communities dominated by five major plant types on the Middle Rio Grande, Upper San Pedro River, and Lower Colorado River was strongly correlated with Enhanced Vegetation Index (EVI) values from the Moderate Resolution Imaging ...
Tópico(s): Hydrology and Watershed Management Studies
2005 - Elsevier BV | Remote Sensing of Environment
Patrick B. Shafroth, James Cleverly, Tom L. Dudley, John‐Paul Taylor, Charles van Riper, Edwin P. Weeks, James N. Stuart,
Tópico(s): Hydrology and Watershed Management Studies
2005 - Springer Science+Business Media | Environmental Management
Pamela L. Nagler, James Cleverly, Edward P. Glenn, D. J. Lampkin, Alfredo Huete, Zhengming Wan,
A vegetation index (VI) model for predicting evapotranspiration (ET) from data from the Moderate Resolution Imaging Spectrometer (MODIS) on the EOS-1 Terra satellite and ground meteorological data was developed for riparian vegetation along the Middle Rio Grande River in New Mexico. Ground ET measurements obtained from eddy covariance towers at four riparian sites were correlated with MODIS VIs, MODIS land surface temperatures (LSTs), and ground micrometeorological data over four years. Sites included ...
Tópico(s): Urban Heat Island Mitigation
2004 - Elsevier BV | Remote Sensing of Environment
Randall J. Donohue, Iain H. Hume, Michael L. Roderick, Tim R. McVicar, Jason Beringer, Lindsay B. Hutley, John Gallant, Jenet Austin, Eva van Gorsel, James Cleverly, Wayne S. Meyer, Stefan K. Arndt,
Vegetation captures carbon from the atmosphere through photosynthesis, the rate of which varies across space, through time and is determined by both physical and biological factors. Methods for estimating photosynthesis (A) vary in their complexity and in which driving processes they capture. Whilst the effect of diffuse shortwave irradiance on A is well understood, few models have explicitly incorporated the diffuse effect into estimates of A. Here we present the DIFFUSE model, a simple, generic, ...
Tópico(s): Remote Sensing and LiDAR Applications
2014 - Elsevier BV | Remote Sensing of Environment
Liang He, James Cleverly, Chao Chen, Xiaoya Yang, Jun Li, Wenzhao Liu, Qiang Yu,
Crop production and water use in rainfed cropland are vulnerable to climate change. This study was to quantify diverse responses of winter wheat ( Triticum aestivum L.) yield and water use to climate change on the Loess Plateau (LP) under different combinations of climatic variables. The crop model APSIM was validated against field experimental data and applied to calculate yield and water use at 18 sites on the LP during 1961 to 2010. The coefficient of variation of yield ranged from 12 to 66%, in ...
Tópico(s): Plant responses to elevated CO2
2014 - Wiley | Agronomy Journal
Sepideh Zolfaghar, Randol Villalobos‐Vega, James Cleverly, Melanie Zeppel, Rizwana Rumman, Derek Eamus,
Although it is well documented that access to groundwater can help plants survive drought in arid and semiarid areas, there have been few studies in mesic environments that have evaluated variation of vegetation characteristics across a naturally occurring gradient in depth-to-groundwater (DGW). The aim of this study was to determine whether differences in groundwater depth influence structural attributes and productivity of remnant woodlands in south-eastern Australia. The study area was located ...
Tópico(s): Tree-ring climate responses
2014 - CSIRO Publishing | Australian Journal of Botany
Hao Shi, Longhui Li, Derek Eamus, James Cleverly, Alfredo Huete, Jason Beringer, Qiang Yu, Eva van Gorsel, Lindsay B. Hutley,
The sensitivity of ecosystem gross primary production (GPP) to availability of water and photosynthetically active radiation (PAR) differs among biomes. Here we investigated variations of ecosystem light-use-efficiency (eLUE: GPP/PAR) and water-use-efficiency (eWUE: GPP/evapotranspiration) among seven Australian eddy covariance sites with differing annual precipitation, species composition and temperature. Changes to both eLUE and eWUE were primarily correlated with atmospheric vapor pressure deficit ( ...
Tópico(s): Ecology and Vegetation Dynamics Studies
2014 - IOP Publishing | Environmental Research Letters
Xuanlong Ma, Alfredo Huete, Qiang Yu, Natalia Restrepo‐Coupé, Jason Beringer, Lindsay B. Hutley, Kasturi Devi Kanniah, James Cleverly, Derek Eamus,
Tópico(s): Plant Water Relations and Carbon Dynamics
2014 - Elsevier BV | Remote Sensing of Environment
Chao Chen, Derek Eamus, James Cleverly, N. Boulain, Peter G. Cook, Lu Zhang, Lei Cheng, Qiang Yu,
For efficient and sustainable utilisation of limited groundwater resources, improved understanding of how vegetation water-use responds to climate variation and the corresponding controls on recharge is essential. This study investigated these responses using a modelling approach. The biophysically based model WAVES was calibrated and validated with more than two years of field experimental data conducted in Mulga (Acacia aneura) in arid central Australia. The validated model was then applied to ...
Tópico(s): Soil and Unsaturated Flow
2014 - Elsevier BV | Journal of Hydrology
James Cleverly, N. Boulain, Randol Villalobos‐Vega, Nicole Grant, Ralph Faux, Cameron Wood, Peter G. Cook, Qiang Yu, Andrea Leigh, Derek Eamus,
Vast areas in the interior of Australia are exposed to regular but infrequent periods of heavy rainfall, interspersed with long periods at high temperatures, but little is known of the carbon budget of these remote areas or how they respond to extreme precipitation. In this study, we applied three methods to partition net ecosystem photosynthesis into gross primary production (GPP) and ecosystem respiration (R e ) during two years of contrasting rainfall. The first year was wet (>250 mm above average ...
Tópico(s): Pasture and Agricultural Systems
2013 - Wiley | Journal of Geophysical Research Biogeosciences
James Cleverly, Chao Chen, N. Boulain, Randol Villalobos‐Vega, Ralph Faux, Nicole Grant, Qiang Yu, Derek Eamus,
Abstract Accurate prediction of evapotranspiration E depends upon representative characterization of meteorological conditions in the boundary layer. Drag and bulk transfer coefficient schemes for estimating aerodynamic resistance to vapor transfer were compared over a semiarid natural woodland ecosystem in central Australia. Aerodynamic resistance was overestimated from the drag coefficient, resulting in limited E at intermediate values of vapor pressure deficit. Large vertical humidity gradients ...
Tópico(s): Climate variability and models
2013 - American Meteorological Society | Journal of Hydrometeorology
Derek Eamus, N. Boulain, James Cleverly, David D. Breshears,
Abstract Drought‐induced tree mortality is occurring across all forested continents and is expected to increase worldwide during the coming century. Regional‐scale forest die‐off influences terrestrial albedo, carbon and water budgets, and land‐surface energy partitioning. Although increased temperatures during drought are widely identified as a critical contributor to exacerbated tree mortality associated with “global‐change‐type drought”, corresponding changes in vapor pressure deficit ( D ) have rarely ...
Tópico(s): Tree-ring climate responses
2013 - Wiley | Ecology and Evolution
Derek Eamus, James Cleverly, N. Boulain, Nicole Grant, Ralph Faux, Randol Villalobos‐Vega,
The study of landscape gas exchange in arid and semi-arid regions is less common than those of more mesic environments, despite their large geographical extent, their importance to regional climate, their socioeconomic values and the carbon and water balances of such regions. In this study we used eddy covariance measurements to examine net ecosystem exchange and water fluxes of a landscape dominated by a N-fixing tree (Acacia aneura; Mulga) as a function of soil moisture content, vapour pressure ...
Tópico(s): Climate variability and models
2013 - Elsevier BV | Agricultural and Forest Meteorology
Xuanlong Ma, Alfredo Huete, Qiang Yu, Natalia Restrepo‐Coupé, Kevin Davies, Mark Broich, P. Ratana, Jason Beringer, Lindsay B. Hutley, James Cleverly, N. Boulain, Derek Eamus,
The phenology of a landscape is a key parameter in climate and biogeochemical cycle models and its correct representation is central to the accurate simulation of carbon, water and energy exchange between the land surface and the atmosphere. Whereas biogeographic phenological patterns and shifts have received much attention in temperate ecosystems, much less is known about the phenology of savannas, despite their sensitivity to climate change and their coverage of approximately one eighth of the ...
Tópico(s): Ecology and Vegetation Dynamics Studies
2013 - Elsevier BV | Remote Sensing of Environment
Nadia S. Santini, James Cleverly, Rolf Faux, Catherine Lestrange, Rizwana Rumman, Derek Eamus,
Species with low density of intact branches are likely to have higher growth rates than species with high density of intact branches, but at the cost of a lower water-use efficiency and larger sensitivity to xylem embolism. The hydraulic niche separation theory proposes that species co-exist by having a range of traits to allow differential access to resources within heterogeneous environments. Here, we examined variation in branch xylem anatomy and foliar carbon stable isotopes (δ13C) as a measure ...
Tópico(s): Hydrology and Sediment Transport Processes
2015 - Springer Science+Business Media | Trees
Derek Eamus, Sepideh Zolfaghar, Randol Villalobos‐Vega, James Cleverly, Alfredo Huete,
Abstract. Groundwater-dependent ecosystems (GDEs) are at risk globally due to unsustainable levels of groundwater extraction, especially in arid and semi-arid regions. In this review, we examine recent developments in the ecohydrology of GDEs with a focus on three knowledge gaps: (1) how do we locate GDEs, (2) how much water is transpired from shallow aquifers by GDEs and (3) what are the responses of GDEs to excessive groundwater extraction? The answers to these questions will determine water allocations ...
Tópico(s): Hydrology and Drought Analysis
2015 - Copernicus Publications | Hydrology and earth system sciences
Sepideh Zolfaghar, Randol Villalobos‐Vega, James Cleverly, Derek Eamus,
The importance of groundwater resources in arid and semi-arid areas for plant survival is well documented. However, there have been few studies examining the importance and impacts of groundwater availability in mesic environments. The aim of this study was to determine how depth-to-groundwater (DGW) impacts on leaf water relations, leaf structure and branch xylem vulnerability to embolism in a mesic environment. We hypothesize that increasing DGW results in increased resistance to drought stress ...
Tópico(s): Horticultural and Viticultural Research
2015 - Oxford University Press | Tree Physiology
Margaret Shanafield, Peter G. Cook, H. A. Gutiérrez‐Jurado, Ralph Faux, James Cleverly, Derek Eamus,
Evaporative losses typically play a substantial role in the water balances of arid regions. However, they are often poorly understood due to low flux rates and difficulty in direct measurement. We compared six field methods to quantify groundwater discharge due to evaporative and evapotranspirative fluxes from Stirling Swamp, a playa in central Australia; Bowen ratio–energy balance (BREB), maximum entropy production (MEP), chloride and stable isotope profiling, change in groundwater level, and 14C ...
Tópico(s): Hydrology and Watershed Management Studies
2015 - Elsevier BV | Journal of Hydrology
Derek Eamus, Alfredo Huete, James Cleverly, Rachael H. Nolan, Xuanlong Ma, Tonantzin Tarín, Nadia S. Santini,
Mulga, comprised of a complex of closely related Acacia spp., grades from a low open forest to tall shrublands in tropical and sub-tropical arid and semi-arid regions of Australia and experiences warm-to-hot annual temperatures and a pronounced dry season. This short synthesis of current knowledge briefly outlines the causes of the extreme variability in rainfall characteristic of much of central Australia, and then discusses the patterns and drivers of variability in carbon and water fluxes of ...
Tópico(s): Hydrology and Sediment Transport Processes
2016 - IOP Publishing | Environmental Research Letters
Jason Beringer, Lindsay B. Hutley, Ian McHugh, Stefan K. Arndt, David I. Campbell, Helen Cleugh, James Cleverly, Víctor Resco de Dios, Derek Eamus, Bradley J. Evans, Cäcilia Ewenz, Peter Grace, Anne Griebel, Vanessa Haverd, Nina Hinko‐Najera, Alfredo Huete, Peter Isaac, Kasturi Devi Kanniah, R. Leuning, Michael J. Liddell, Craig Macfarlane, Wayne S. Meyer, Caitlin E. Moore, Elise Pendall, Alison Phillips, R. Phillips, Suzanne M. Prober, Natalia Restrepo‐Coupé, Susanna Rutledge-Jonker, Ivan Schroder, Richard Silberstein, Patricia Southall, Mei Sun Yee, Nigel Tapper, Eva van Gorsel, Camilla Vote, Jeffrey P. Walker, Tim Wardlaw,
Abstract. OzFlux is the regional Australian and New Zealand flux tower network that aims to provide a continental-scale national research facility to monitor and assess trends, and improve predictions, of Australia's terrestrial biosphere and climate. This paper describes the evolution, design, and current status of OzFlux as well as provides an overview of data processing. We analyse measurements from all sites within the Australian portion of the OzFlux network and two sites from New Zealand. ...
Tópico(s): Climate variability and models
2016 - Copernicus Publications | Biogeosciences
James Cleverly, Derek Eamus, Natalia Restrepo‐Coupé, Chao Chen, Wouter H. Maes, Longhui Li, Ralph Faux, Nadia S. Santini, Rizwana Rumman, Qiang Yu, Alfredo Huete,
The Earth's Critical Zone, where physical, chemical and biological systems interact, extends from the top of the canopy to the underlying bedrock. In this study, we investigated soil moisture controls on phenology and productivity of an Acacia woodland in semi-arid central Australia. Situated on an extensive sand plain with negligible runoff and drainage, the carry-over of soil moisture content (θ) in the rhizosphere enabled the delay of phenology and productivity across seasons, until conditions ...
Tópico(s): Tree Root and Stability Studies
2016 - Elsevier BV | The Science of The Total Environment
Chiara Holgate, Richard de Jeu, Albert I. J. M. van Dijk, Y.Y Liu, Luigi J. Renzullo, Vinodkumar, Imtiaz Dharssi, Robert Parinussa, Robin van der Schalie, Anouk Gevaert, Jeffrey P. Walker, David McJannet, James Cleverly, Vanessa Haverd, Cathy M. Trudinger, Peter Briggs,
This study compared surface soil moisture from 11 separate remote sensing and modelled products across Australia in a common framework. The comparison was based on a correlation analysis between soil moisture products and in situ data collated from three separate ground-based networks: OzFlux, OzNet and CosmOz. The correlation analysis was performed using both original data sets and temporal anomalies, and was supported by examination of the time series plots. The interrelationships between the ...
Tópico(s): Hydrology and Watershed Management Studies
2016 - Elsevier BV | Remote Sensing of Environment
James Cleverly, Derek Eamus, Eva van Gorsel, Chao Chen, Rizwana Rumman, Qunying Luo, Natalia Restrepo‐Coupé, Longhui Li, Natascha Kljun, Ralph Faux, Qiang Yu, Alfredo Huete,
Global carbon balances are increasingly affected by large fluctuations in productivity occurring throughout semiarid regions. Recent analyses found a large C uptake anomaly in 2011 in arid and semiarid regions of the southern hemisphere. Consequently, we compared C and water fluxes of two distinct woody ecosystems (a Mulga (Acacia) woodland and a Corymbia savanna) between August 2012 and August 2014 in semiarid central Australia, demonstrating that the 2011 anomaly was short-lived in both ecosystems. ...
Tópico(s): Hydrology and Watershed Management Studies
2016 - Elsevier BV | Agricultural and Forest Meteorology
Hao Shi, Longhui Li, Derek Eamus, Alfredo Huete, James Cleverly, Xin Tian, Qiang Yu, Shaoqiang Wang, Leonardo Montagnani, Vincenzo Magliulo, Eyal Rotenberg, Marian Pavelka, Arnaud Carrara,
Terrestrial ecosystem gross primary production (GPP) is the largest component in the global carbon cycle. The enhanced vegetation index (EVI) has been proven to be strongly correlated with annual GPP within several biomes. However, the annual GPP-EVI relationship and associated environmental regulations have not yet been comprehensively investigated across biomes at the global scale. Here we explored relationships between annual integrated EVI (iEVI) and annual GPP observed at 155 flux sites, where ...
Tópico(s): Climate variability and models
2016 - Elsevier BV | Ecological Indicators
Anne Griebel, Lauren T. Bennett, Daniel Metzen, James Cleverly, George Burba, Stefan K. Arndt,
Tópico(s): Climate variability and models
2016 - Elsevier BV | Agricultural and Forest Meteorology