Prevalence and magnitude of groundwater use by vegetation: A global stable isotope meta-analysis

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Prevalence and magnitude of groundwater use by vegetation : A global stable isotope meta-analysis. / Evaristo, Jaivime; McDonnell, Jeffrey J.

In: Scientific Reports, Vol. 7, 44110, 10.03.2017.

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@article{83bf3a1d8e824320bfc960158783008d,
title = "Prevalence and magnitude of groundwater use by vegetation: A global stable isotope meta-analysis",
abstract = "The role of groundwater as a resource in sustaining terrestrial vegetation is widely recognized. But the global prevalence and magnitude of groundwater use by vegetation is unknown. Here we perform a meta-analysis of plant xylem water stable isotope (δ2H and δ18O, n = 7367) information from 138 published papers - representing 251 genera, and 414 species of angiosperms (n = 376) and gymnosperms (n = 38). We show that the prevalence of groundwater use by vegetation (defined as the number of samples out of a universe of plant samples reported to have groundwater contribution to xylem water) is 37{\%} (95{\%} confidence interval, 28-46{\%}). This is across 162 sites and 12 terrestrial biomes (89{\%} of heterogeneity explained; Q-value = 1235; P < 0.0001). However, the magnitude of groundwater source contribution to the xylem water mixture (defined as the proportion of groundwater contribution in xylem water) is limited to 23{\%} (95{\%} CI, 20-26{\%}; 95{\%} prediction interval, 3-77{\%}). Spatial analysis shows that the magnitude of groundwater source contribution increases with aridity. Our results suggest that while groundwater influence is globally prevalent, its proportional contribution to the total terrestrial transpiration is limited.",
author = "Jaivime Evaristo and McDonnell, {Jeffrey J.}",
year = "2017",
month = "3",
day = "10",
doi = "10.1038/srep44110",
language = "English",
volume = "7",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",

}

RIS

TY - JOUR

T1 - Prevalence and magnitude of groundwater use by vegetation

T2 - A global stable isotope meta-analysis

AU - Evaristo, Jaivime

AU - McDonnell, Jeffrey J.

PY - 2017/3/10

Y1 - 2017/3/10

N2 - The role of groundwater as a resource in sustaining terrestrial vegetation is widely recognized. But the global prevalence and magnitude of groundwater use by vegetation is unknown. Here we perform a meta-analysis of plant xylem water stable isotope (δ2H and δ18O, n = 7367) information from 138 published papers - representing 251 genera, and 414 species of angiosperms (n = 376) and gymnosperms (n = 38). We show that the prevalence of groundwater use by vegetation (defined as the number of samples out of a universe of plant samples reported to have groundwater contribution to xylem water) is 37% (95% confidence interval, 28-46%). This is across 162 sites and 12 terrestrial biomes (89% of heterogeneity explained; Q-value = 1235; P < 0.0001). However, the magnitude of groundwater source contribution to the xylem water mixture (defined as the proportion of groundwater contribution in xylem water) is limited to 23% (95% CI, 20-26%; 95% prediction interval, 3-77%). Spatial analysis shows that the magnitude of groundwater source contribution increases with aridity. Our results suggest that while groundwater influence is globally prevalent, its proportional contribution to the total terrestrial transpiration is limited.

AB - The role of groundwater as a resource in sustaining terrestrial vegetation is widely recognized. But the global prevalence and magnitude of groundwater use by vegetation is unknown. Here we perform a meta-analysis of plant xylem water stable isotope (δ2H and δ18O, n = 7367) information from 138 published papers - representing 251 genera, and 414 species of angiosperms (n = 376) and gymnosperms (n = 38). We show that the prevalence of groundwater use by vegetation (defined as the number of samples out of a universe of plant samples reported to have groundwater contribution to xylem water) is 37% (95% confidence interval, 28-46%). This is across 162 sites and 12 terrestrial biomes (89% of heterogeneity explained; Q-value = 1235; P < 0.0001). However, the magnitude of groundwater source contribution to the xylem water mixture (defined as the proportion of groundwater contribution in xylem water) is limited to 23% (95% CI, 20-26%; 95% prediction interval, 3-77%). Spatial analysis shows that the magnitude of groundwater source contribution increases with aridity. Our results suggest that while groundwater influence is globally prevalent, its proportional contribution to the total terrestrial transpiration is limited.

UR - http://www.scopus.com/inward/record.url?scp=85014969815&partnerID=8YFLogxK

U2 - 10.1038/srep44110

DO - 10.1038/srep44110

M3 - Article

C2 - 28281644

AN - SCOPUS:85014969815

VL - 7

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 44110

ER -