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Sub-annual variability in historical water source use by Mediterranean riparian trees

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Sub-annual variability in historical water source use by Mediterranean riparian trees. / Sargeant, Christopher; Singer, Michael David.

In: Ecohydrology, Vol. 9, No. 7, 10.2016, p. 1328-1345.

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Sargeant, C & Singer, MD 2016, 'Sub-annual variability in historical water source use by Mediterranean riparian trees' Ecohydrology, vol. 9, no. 7, pp. 1328-1345. https://doi.org/10.1002/eco.1730

APA

Sargeant, C., & Singer, M. D. (2016). Sub-annual variability in historical water source use by Mediterranean riparian trees. Ecohydrology, 9(7), 1328-1345. https://doi.org/10.1002/eco.1730

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Sargeant C, Singer MD. Sub-annual variability in historical water source use by Mediterranean riparian trees. Ecohydrology. 2016 Oct;9(7):1328-1345. https://doi.org/10.1002/eco.1730

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Sargeant, Christopher ; Singer, Michael David. / Sub-annual variability in historical water source use by Mediterranean riparian trees. In: Ecohydrology. 2016 ; Vol. 9, No. 7. pp. 1328-1345.

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@article{960ec1c7323a46ca997487e6698ac9f8,
title = "Sub-annual variability in historical water source use by Mediterranean riparian trees",
abstract = "The seasonal availability of water within a tree’s rooting zone may be an important determinant for individual tree growth and overall forest health, particularly in riparian corridors of Mediterranean climate zones that are vulnerable to water stress. Here, we present a new method that combines dendro-isotopes and isotope modelling for determining how water source use varies over 10 consecutive growing seasons (2000-2010) for co-occurring species Populus nigra and Fraxinus excelsior, along the Rh{\^o}ne River, south-eastern France. We conducted highly resolved δ18O analysis of cellulose micro-slices within tree rings and back-calculated the δ18O signature of source water available at the time of growth using a biochemical fractionation model. We related these patterns to inferred seasonal hydrologicalpartitioning through comparison with δ18O of waters from the vadose and phreatic zones, precipitation, and streamflow. The shallowly rooted Fraxinus displayed greater sub-annual source water variability, as well as greater isotopic enrichment, reflecting use of precipitation-derived vadose moisture. Its earlywood was formed mainly from winter rainfall(δ18O depleted) whilst the latewood was composed from growing season precipitation (δ18O enriched). In Populus, the sub-annual source water use was relatively depleted, suggesting use of hyporheic water and regional groundwater. From 2007, both species converged in their pattern of water source uptake which was attributed to a decline in phreatic water access for Populus. These results demonstrate that the seasonal variability in source water use can be identified retrospectively, a method which may prove important for anticipating the future consequences of climate-driven changes to the hydrological cycle.",
keywords = "Tree-rings, Cellulose, δ18O, Riparian, Phreatic, Vadose, Floodplain, Hydrology, Climate, Plant-water relations",
author = "Christopher Sargeant and Singer, {Michael David}",
note = "This work was supported financially by a NERC PhD Studentship to CIS, Observatoire Hommes/Milieux Vall{\'e}e du Rh{\^o}ne and the Department of Earth and Environmental Sciences at the University of St. Andrews",
year = "2016",
month = "10",
doi = "10.1002/eco.1730",
language = "English",
volume = "9",
pages = "1328--1345",
journal = "Ecohydrology",
issn = "1936-0592",
publisher = "John Wiley and Sons",
number = "7",

}

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TY - JOUR

T1 - Sub-annual variability in historical water source use by Mediterranean riparian trees

AU - Sargeant, Christopher

AU - Singer, Michael David

N1 - This work was supported financially by a NERC PhD Studentship to CIS, Observatoire Hommes/Milieux Vallée du Rhône and the Department of Earth and Environmental Sciences at the University of St. Andrews

PY - 2016/10

Y1 - 2016/10

N2 - The seasonal availability of water within a tree’s rooting zone may be an important determinant for individual tree growth and overall forest health, particularly in riparian corridors of Mediterranean climate zones that are vulnerable to water stress. Here, we present a new method that combines dendro-isotopes and isotope modelling for determining how water source use varies over 10 consecutive growing seasons (2000-2010) for co-occurring species Populus nigra and Fraxinus excelsior, along the Rhône River, south-eastern France. We conducted highly resolved δ18O analysis of cellulose micro-slices within tree rings and back-calculated the δ18O signature of source water available at the time of growth using a biochemical fractionation model. We related these patterns to inferred seasonal hydrologicalpartitioning through comparison with δ18O of waters from the vadose and phreatic zones, precipitation, and streamflow. The shallowly rooted Fraxinus displayed greater sub-annual source water variability, as well as greater isotopic enrichment, reflecting use of precipitation-derived vadose moisture. Its earlywood was formed mainly from winter rainfall(δ18O depleted) whilst the latewood was composed from growing season precipitation (δ18O enriched). In Populus, the sub-annual source water use was relatively depleted, suggesting use of hyporheic water and regional groundwater. From 2007, both species converged in their pattern of water source uptake which was attributed to a decline in phreatic water access for Populus. These results demonstrate that the seasonal variability in source water use can be identified retrospectively, a method which may prove important for anticipating the future consequences of climate-driven changes to the hydrological cycle.

AB - The seasonal availability of water within a tree’s rooting zone may be an important determinant for individual tree growth and overall forest health, particularly in riparian corridors of Mediterranean climate zones that are vulnerable to water stress. Here, we present a new method that combines dendro-isotopes and isotope modelling for determining how water source use varies over 10 consecutive growing seasons (2000-2010) for co-occurring species Populus nigra and Fraxinus excelsior, along the Rhône River, south-eastern France. We conducted highly resolved δ18O analysis of cellulose micro-slices within tree rings and back-calculated the δ18O signature of source water available at the time of growth using a biochemical fractionation model. We related these patterns to inferred seasonal hydrologicalpartitioning through comparison with δ18O of waters from the vadose and phreatic zones, precipitation, and streamflow. The shallowly rooted Fraxinus displayed greater sub-annual source water variability, as well as greater isotopic enrichment, reflecting use of precipitation-derived vadose moisture. Its earlywood was formed mainly from winter rainfall(δ18O depleted) whilst the latewood was composed from growing season precipitation (δ18O enriched). In Populus, the sub-annual source water use was relatively depleted, suggesting use of hyporheic water and regional groundwater. From 2007, both species converged in their pattern of water source uptake which was attributed to a decline in phreatic water access for Populus. These results demonstrate that the seasonal variability in source water use can be identified retrospectively, a method which may prove important for anticipating the future consequences of climate-driven changes to the hydrological cycle.

KW - Tree-rings

KW - Cellulose

KW - δ18O

KW - Riparian

KW - Phreatic

KW - Vadose

KW - Floodplain

KW - Hydrology

KW - Climate

KW - Plant-water relations

U2 - 10.1002/eco.1730

DO - 10.1002/eco.1730

M3 - Article

VL - 9

SP - 1328

EP - 1345

JO - Ecohydrology

T2 - Ecohydrology

JF - Ecohydrology

SN - 1936-0592

IS - 7

ER -

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