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Title: Little vertical and circumferential variations in stem xylem water Δ2H and Δ18O in three tree species

Abstract

Vertical and circumferential patterns of xylem water isotope signatures in large trees are rarely characterized but may influence interpretation of water source investigations and soil/xylem water isotope offsets. Furthermore, to examine vertical and circumferential variation in xylem water δ2H and δ18O, we collected xylem tissue at 5 heights (0, 1, 4, 7 and 10 m) from three replicate trees of three species with contrasting xylem anatomy, two angiosperms (Liquidambar styraciflua and Quercus nigra) and one gymnosperm (Pinus taeda). Concurrently, we also determined δ2H and δ18O of groundwater, soil water, and recent precipitation. On a different day, we collected circumferential samples at 1 m from the same trees to test for sectorality effects. Water from stem and soil samples were cryogenically extracted and analyzed for δ2H and δ18O. Mean xylem water δ2H and δ18O were significantly different between species, both vertically and circumferentially. We did not find significant (p = 0.05) systematic variation in δ2H or δ18O with height. We found no significant evidence for sectorality effects on δ2H, δ18O. Variances of vertical synoptic xylem water δ2H or δ18O were similar between species, 7.2–10.4‰ for δ2H and 0.58–0.81‰ for δ18O. Circumferential variances were also similar between species, 4.0–6.0 for δ2H andmore » 0.37–0.44 for δ18O. A mixing model showed that sweetgum, water oak and loblolly pine, were drawing most of their water from deep soil from 45 to 190 cm (84.7, 68.4 and 53.2%, respectively) however, soil water-excess values indicate δ2H fractionation effects on these estimates. Dual isotope mixing model evaluation with single and multiple sample configurations showed that source water estimates were not affected by within tree variability of xylem water signatures. Xylem water δ2H and δ18O variability with height or circumference, was 3.2 and 2.7 times less than between tree variation because of transient temporal and spatial processes and is, therefore, not likely to affect interpretations of water sourcing in these three species.« less

Authors:
ORCiD logo [1];  [2];  [2];  [3];  [3]
  1. The Jones Center at Ichauway, Newton, GA (United States); University of Georgia, Athens, GA (United States); University of Georgia, Aiken, SC (United States)
  2. University of Georgia, Athens, GA (United States)
  3. University of Georgia, Athens, GA (United States); University of Georgia, Aiken, SC (United States)
Publication Date:
Research Org.:
Savannah River Ecology Laboratory, Aiken, SC (United States)
Sponsoring Org.:
USDOE; USDA National Institute of Food and Agriculture, Agriculture and Food Research Initiative
OSTI Identifier:
2228455
Grant/Contract Number:  
EM0005228; EM0004391; EM0003622; 2013-67009-21405; 2013-67009-25148; 2019-67019-29906
Resource Type:
Accepted Manuscript
Journal Name:
Trees
Additional Journal Information:
Journal Volume: 37; Journal Issue: 5; Journal ID: ISSN 0931-1890
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Isotope hydrology; Xylem anatomy; Isotope fractionation; Within tree isotope variability; Ecohydrology

Citation Formats

Younger, Seth E., Monda, L. G., Jackson, C. R., Blake, J., and Aubrey, D. P. Little vertical and circumferential variations in stem xylem water Δ2H and Δ18O in three tree species. United States: N. p., 2023. Web. doi:10.1007/s00468-023-02431-3.
Younger, Seth E., Monda, L. G., Jackson, C. R., Blake, J., & Aubrey, D. P. Little vertical and circumferential variations in stem xylem water Δ2H and Δ18O in three tree species. United States. https://doi.org/10.1007/s00468-023-02431-3
Younger, Seth E., Monda, L. G., Jackson, C. R., Blake, J., and Aubrey, D. P. Sun . "Little vertical and circumferential variations in stem xylem water Δ2H and Δ18O in three tree species". United States. https://doi.org/10.1007/s00468-023-02431-3.
@article{osti_2228455,
title = {Little vertical and circumferential variations in stem xylem water Δ2H and Δ18O in three tree species},
author = {Younger, Seth E. and Monda, L. G. and Jackson, C. R. and Blake, J. and Aubrey, D. P.},
abstractNote = {Vertical and circumferential patterns of xylem water isotope signatures in large trees are rarely characterized but may influence interpretation of water source investigations and soil/xylem water isotope offsets. Furthermore, to examine vertical and circumferential variation in xylem water δ2H and δ18O, we collected xylem tissue at 5 heights (0, 1, 4, 7 and 10 m) from three replicate trees of three species with contrasting xylem anatomy, two angiosperms (Liquidambar styraciflua and Quercus nigra) and one gymnosperm (Pinus taeda). Concurrently, we also determined δ2H and δ18O of groundwater, soil water, and recent precipitation. On a different day, we collected circumferential samples at 1 m from the same trees to test for sectorality effects. Water from stem and soil samples were cryogenically extracted and analyzed for δ2H and δ18O. Mean xylem water δ2H and δ18O were significantly different between species, both vertically and circumferentially. We did not find significant (p = 0.05) systematic variation in δ2H or δ18O with height. We found no significant evidence for sectorality effects on δ2H, δ18O. Variances of vertical synoptic xylem water δ2H or δ18O were similar between species, 7.2–10.4‰ for δ2H and 0.58–0.81‰ for δ18O. Circumferential variances were also similar between species, 4.0–6.0 for δ2H and 0.37–0.44 for δ18O. A mixing model showed that sweetgum, water oak and loblolly pine, were drawing most of their water from deep soil from 45 to 190 cm (84.7, 68.4 and 53.2%, respectively) however, soil water-excess values indicate δ2H fractionation effects on these estimates. Dual isotope mixing model evaluation with single and multiple sample configurations showed that source water estimates were not affected by within tree variability of xylem water signatures. Xylem water δ2H and δ18O variability with height or circumference, was 3.2 and 2.7 times less than between tree variation because of transient temporal and spatial processes and is, therefore, not likely to affect interpretations of water sourcing in these three species.},
doi = {10.1007/s00468-023-02431-3},
journal = {Trees},
number = 5,
volume = 37,
place = {United States},
year = {Sun Jul 16 00:00:00 EDT 2023},
month = {Sun Jul 16 00:00:00 EDT 2023}
}

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