Hydrogeomorphic control on tree growth responses in the Elton area of the Cheshire Saltfield, UK

Lageard, Jonathan G. A.; Drew, Ian B.

doi:10.1016/j.geomorph.2007.05.017

Cited by 12 publications

(10 citation statements)

References 30 publications

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“…Longer-term trends in depth-to-groundwater have impacted dendrochronologies in both directions, toward lower growth rates with groundwater extraction (Lageard and Drew, 2008) and toward increasing growth rates with decreasing depth-to-groundwater, except in response to root anoxia arising from flooding (Bogino and Jobbagy, 2011). However, specific responses depend upon depth-togroundwater and individual differences amongst functional types; for example, riparian cottonwood trees (P. fremontii) responded to rewetting with growth that was larger and faster than the response of co-occurring willow (S. exigua), a smallstature, thicket-forming shrub that is restricted to streamside areas with very shallow groundwater (Scurlock, 1998;Rood et al, 2011).…”

Section: Effects Of Groundwater On Growth and Dendrochronological Traitsmentioning

confidence: 99%

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

Eamus

Zolfaghar

Villalobos‐Vega

et al. 2015

Hydrol. Earth Syst. Sci.

132

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: Effects Of Groundwater On Growth and Dendrochronological Traitsmentioning

confidence: 99%

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

Eamus

Zolfaghar

Villalobos‐Vega

et al. 2015

Hydrol. Earth Syst. Sci.

132

112

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“…Floodplain forests are among the most threatened ecosystems because of their extensive conversion into agricultural or urban lands [5]. These forests reflect the human footprint on hydroecological dynamics including the modification of river dynamics through dam building [6]. In floodplain forests, dieback and tree mortality episodes have been attributed to sudden hydrological deteriorations caused by soil water drainages [4].…”

Section: Introductionmentioning

confidence: 99%

Drought Decreases Growth and Increases Mortality of Coexisting Native and Introduced Tree Species in a Temperate Floodplain Forest

Colangelo

Camarero

Ripullone

et al. 2018

Forests

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Forest dieback and mortality events induced by drought stress are widely reported. However, few studies have jointly examined the role played by drought on growth and mortality in tree species inhabiting floodplain forests. Here, we focused on mortality events occurring since the early 2000s on large areas in a floodplain forest located within the Ticino regional park in Northwest Italy, where affected native (pedunculate oak, Quercus robur L.) and introduced tree species (black locust, Robinia pseudoacacia L.) coexist. We related growth with climate data and drought severity to discern if these species were similarly affected by drought. Then, we: (i) evaluated the presence of pathogens of the genus Phytophthora in recently dead oak trees since this was the most affected species and pathogens are often associated with oak decline cases; and (ii) compared xylem vessel diameter and tree-ring C isotope discrimination (δ 13 C) to highlight differences in water-use strategies between living and dead trees in both species. The radial growth of living and dead trees started diverging in the 1970s, although only after warm-drought periods occurred during 1990s did this divergence become significant. Growth of trees that died responded more negatively to drought than in the case of living trees. Moreover, trees that died formed smaller xylem vessels in the past than living trees and also showed more negative δ 13 C values in both tree species, indicating a higher intrinsic water-use efficiency in living than in dead trees. The pathogen Phytophthora cinnamomi Rands was only detected in one recently dead tree, suggesting that it is unlikely that dead oaks were predisposed to drought damage by the pathogen. We conclude that a climate shift from wet to warm-dry summer conditions in the early 1990s triggered forest dieback and induced mortality in both tree species. Temperate floodplain forests are susceptible to drought-induced dieback. The drought-sensitivity of both species could lead to successional shifts driven by a reduction of N inputs through N-fixing by black locust and the replacement of oak by drought-tolerant species.

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“…drainage, floods, pumping of water or dilution) on the growth of coniferous species, less on broadleaved species (Becker et al, 1996;Choi et al,. 2007;Dang and Lieffers, 1989;Freléchoux et al, 2000;Douda et al, 2009;Linderholm 1999;Linderholm and Leine 2004;Lageard and Drew 2008).…”

Section: Introductionmentioning

confidence: 99%

Growth responses of sessile oak to climate and hydrological regime in the Zbytka Nature Reserve, Czech Republic

Čejková

Poláková

2012

Geochronometria

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Abstract:Complex of Nature reservation Zbytka is the rest of various fen vegetation in the northeast part of the Czech Republic. It represents an important spring area which provides high quality potable water for more than 150 000 inhabitants. Waterworks utilization was started in the 1960s and the change of land-use practices has had a strong effect on the ecosystem. Oak chronology has been showing different tree growth trends since the start of the waterworks utilization. Also the occurrences of negative pointer years differ markedly before and after initiation of pumping underground water. Dendroclimatological analyses primarily revealed a close relationship between the temperature and tree growth -positive influence of spring and summer temperature. The period 1983-1992 of maximum artesian water pumping is expressed as higher tree-ring increments, but linear model analyses showed that the growth reaction of oak is not due to simple causality between temperature and underground water level. The radial increments reacted positively to the combination of high temperature during the vegetation season and low or, the contrary, high depth of underground water level. No direct relationship was detected between tree growth and fluctuation of underground water level; despite of the results dendrochronological data may be useful in historical ground water modelling studies. Results are also crucial for conflict of interests between nature preservation and potable water supply.

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Hydrogeomorphic control on tree growth responses in the Elton area of the Cheshire Saltfield, UK

Cited by 12 publications

References 30 publications

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

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

Drought Decreases Growth and Increases Mortality of Coexisting Native and Introduced Tree Species in a Temperate Floodplain Forest

Growth responses of sessile oak to climate and hydrological regime in the Zbytka Nature Reserve, Czech Republic

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