Groundwater use by native plants in response to changes in precipitation in an intermountain basin

Kray, Julie A.; Cooper, David J.; Sanderson, John S.

doi:10.1016/j.jaridenv.2012.03.009

Cited by 38 publications

(34 citation statements)

References 39 publications

(71 reference statements)

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“…Three generalities can be identified in the results of stable isotope studies of GDEs. First, multi-species comparisons at a common site generally confirm niche separation (spatially or temporally) in patterns of water uptake, thereby minimising competition for water (Lamontagne et al, 2005;Querejeta et al, 2007;Kray et al, 2012). Second, increased depth-to-groundwater results in a declining proportion of groundwater use (O'Grady et al, 2006), although this can vary amongst different vegetation communities (McLendon et al, 2008).…”

Section: Using Stable Isotopes To Estimate Rates Of Groundwater Usementioning

confidence: 94%

“…Direct evidence that vegetation is using groundwater can be obtained by comparing the stable isotope composition of groundwater, soil water, surface water (if relevant) and xylem water (Thorburn et al, 1993;Zencich et al, 2002;Lamontagne et al, 2005;O'Grady et al, 2006a, b;Kray et al, 2012;Busch et al, 1992;Ehleringer and Dawson, 1992;. This method is very effective in semi-arid regions where groundwater is derived from snowmelt or winter precipitation (which is isotopically lighter than summer precipitation) (Ehleringer and Dawson, 1992;Jobbagy et al, 2011).…”

Section: Stable Isotope Analysismentioning

confidence: 99%

“…Estimates of the proportion of total vegetation water use derived from groundwater can be determined from stable isotope analyses (Querejeta et al, 2007;Maguas et al, 2011;Feikema et al, 2010;Kray et al, 2012;McLendon et al, 2008). Two types of information are required to quantitatively partition ET g from ET.…”

Section: Using Stable Isotopes To Estimate Rates Of Groundwater Usementioning

confidence: 99%

“…Second, increased depth-to-groundwater results in a declining proportion of groundwater use (O'Grady et al, 2006), although this can vary amongst different vegetation communities (McLendon et al, 2008). Finally, as time since last rain increases, the proportion of groundwater used by vegetation usually increases (McLendon et al, 2008), but not always (Kray et al, 2012). Consequently, seasonality of groundwater use may occur when rainfall is highly seasonal and groundwater availability is maintained throughout the dry season (O'Grady et al, 2006).…”

Section: Using Stable Isotopes To Estimate Rates Of Groundwater Usementioning

confidence: 99%

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Groundwater-dependent ecosystems: recent insights from satellite and field-based studies

Eamus

Zolfaghar

Villalobos‐Vega

et al. 2015

Hydrol. Earth Syst. Sci.

128

112

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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 that are required to sustain functioning of GDEs and to guide regulations on groundwater extraction to avoid negative impacts on GDEs.We discuss three methods for identifying GDEs: (1) techniques relying on remotely sensed information; (2) fluctuations in depth-to-groundwater that are associated with diurnal variations in transpiration; and (3) stable isotope analysis of water sources in the transpiration stream.We then discuss several methods for estimating rates of GW use, including direct measurement using sapflux or eddy covariance technologies, estimation of a climate wetness index within a Budyko framework, spatial distribution of evapotranspiration (ET) using remote sensing, groundwater modelling and stable isotopes. Remote sensing methods often rely on direct measurements to calibrate the relationship between vegetation indices and ET. ET from GDEs is also determined using hydrologic models of varying complexity, from the White method to fully coupled, variable saturation models. Combinations of methods are typically employed to obtain clearer insight into the components of groundwater discharge in GDEs, such as the proportional importance of transpiration versus evaporation (e.g. using stable isotopes) or from groundwater versus rainwater sources.Groundwater extraction can have severe consequences for the structure and function of GDEs. In the most extreme cases, phreatophytes experience crown dieback and death following groundwater drawdown. We provide a brief review of two case studies of the impacts of GW extraction and then provide an ecosystem-scale, multiple trait, integrated metric of the impact of differences in groundwater depth on the structure and function of eucalypt forests growing along a natural gradient in depth-to-groundwater. We conclude with a discussion of a depth-to-groundwater threshold in this mesic GDE. Beyond this threshold, significant changes occur in ecosystem structure and function.

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Section: Using Stable Isotopes To Estimate Rates Of Groundwater Usementioning

confidence: 94%

Section: Stable Isotope Analysismentioning

confidence: 99%

Section: Using Stable Isotopes To Estimate Rates Of Groundwater Usementioning

confidence: 99%

Section: Using Stable Isotopes To Estimate Rates Of Groundwater Usementioning

confidence: 99%

See 2 more Smart Citations

Groundwater-dependent ecosystems: recent insights from satellite and field-based studies

Eamus

Zolfaghar

Villalobos‐Vega

et al. 2015

Hydrol. Earth Syst. Sci.

128

112

View full text Add to dashboard Cite

show abstract

“…Direct evidence that vegetation is using groundwater can be obtained by comparing the stable isotope composition of groundwater, soil water, surface water (where relevant) and vegetation xylem water (Kray et al 2012;Lamontagne et al 2005;O'Grady et al 2006;Thorburn et al 1993;Zencich et al 2002;Spałek and ProÁk ow 2011). A direct comparison of periodic measurements was made by Hunt et al (1996) who showed that time integration provided by measurements of isotopic composition was a valuable tool that provide insights not available from non-isotopic techniques.…”

Section: Geochemical Indication Of Gde Status: Tracers and Isotopesmentioning

confidence: 99%

Groundwater Dependent Ecosystems: Classification, Identification Techniques and Threats

Eamus

Springer

et al. 2016

Integrated Groundwater Management

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This chapter begins by briefly discussing the three major classes of groundwater dependent ecosystems (GDEs), namely: (I) GDEs that reside within groundwater (e.g. karsts; stygofauna); (II) GDEs requiring the surface expression of groundwater (e.g. springs; wetlands); and (III) GDEs dependent upon sub-surface availability of groundwater within the rooting depth of vegetation (e.g. woodlands; riparian forests). We then discuss a range of techniques available for identifying the location of GDEs in a landscape, with a primary focus of class III GDEs and a secondary focus of class II GDEs. These techniques include inferential methodologies, using hydrological, geochemical and geomorphological indicators, biotic assemblages, historical documentation, and remote sensing methodologies. Techniques available to quantify groundwater use by GDEs are briefly described, including application of simple modelling tools, remote sensing methods and complex modelling applications. This chapter also outlines the contemporary threats to the persistence of GDEs across the world. This involves a description of the "natural" hydrological attributes relevant to GDEs and the

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Ecology of Phreatophytes

Thomas

2013

Progress in Botany

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Groundwater use by native plants in response to changes in precipitation in an intermountain basin

Cited by 38 publications

References 39 publications

Groundwater-dependent ecosystems: recent insights from satellite and field-based studies

Groundwater-dependent ecosystems: recent insights from satellite and field-based studies

Groundwater Dependent Ecosystems: Classification, Identification Techniques and Threats

Ecology of Phreatophytes

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