Spatial and temporal patterns of soil water storage and vegetation water use in humid northern catchments

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Abstract

Using stable isotope data from soil and vegetation xylem samples across a range of landscape positions, this study provides preliminary insights into spatial patterns and temporal dynamics of soil-plant water interactions in a humid, low-energy northern environment. Our analysis showed that evaporative fractionation affected the isotopic signatures in soil water at shallow depths but was less marked than previously observed in other environments. By comparing the temporal dynamics of stable isotopes in soil water mainly held at suctions around and below field capacity, we found that these waters are not clearly separated. The study inferred that vegetation water sources at all sites were relatively constant, and most likely to be in the upper profile close to the soil/atmosphere interface. The data analyses also suggested that both vegetation type and landscape position, including soil type, may have a strong influence on local water uptake patterns, although more work is needed to explicitly identify water sources and understand the effect of plant physiological processes on xylem isotopic water signatures.
Original languageEnglish
Pages (from-to)486-493
Number of pages8
JournalScience of the Total Environment
Volume595
Early online date2 May 2017
DOIs
Publication statusPublished - 1 Oct 2017

Fingerprint

water storage
Catchments
water use
soil water
catchment
Soils
Water
vegetation
xylem
stable isotope
water
Isotopes
soil
field capacity
water uptake
suction
vegetation type
soil type
fractionation
Fractionation

Keywords

  • vegetation water use
  • soil water storage
  • isotopes

Cite this

@article{2095bf5dcda941c987c533cbca7387a7,
title = "Spatial and temporal patterns of soil water storage and vegetation water use in humid northern catchments",
abstract = "Using stable isotope data from soil and vegetation xylem samples across a range of landscape positions, this study provides preliminary insights into spatial patterns and temporal dynamics of soil-plant water interactions in a humid, low-energy northern environment. Our analysis showed that evaporative fractionation affected the isotopic signatures in soil water at shallow depths but was less marked than previously observed in other environments. By comparing the temporal dynamics of stable isotopes in soil water mainly held at suctions around and below field capacity, we found that these waters are not clearly separated. The study inferred that vegetation water sources at all sites were relatively constant, and most likely to be in the upper profile close to the soil/atmosphere interface. The data analyses also suggested that both vegetation type and landscape position, including soil type, may have a strong influence on local water uptake patterns, although more work is needed to explicitly identify water sources and understand the effect of plant physiological processes on xylem isotopic water signatures.",
keywords = "vegetation water use, soil water storage, isotopes",
author = "Josie Geris and Doerthe Tetzlaff and McDonnell, {Jeffrey J.} and Chris Soulsby",
note = "We are thankful for the assistance of Audrey Innes (University of Aberdeen) and Kim Janzen (University of Saskatchewan) with soil and vegetation laboratory sample preparation and analyses. We would like to thank the European Research Council (ERC, project GA 335910 VeWa) for funding. The comments from two reviewers greatly improved an earlier version of the manuscript, for which we are highly grateful.",
year = "2017",
month = "10",
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doi = "10.1016/j.scitotenv.2017.03.275",
language = "English",
volume = "595",
pages = "486--493",
journal = "Science of the Total Environment",
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TY - JOUR

T1 - Spatial and temporal patterns of soil water storage and vegetation water use in humid northern catchments

AU - Geris, Josie

AU - Tetzlaff, Doerthe

AU - McDonnell, Jeffrey J.

AU - Soulsby, Chris

N1 - We are thankful for the assistance of Audrey Innes (University of Aberdeen) and Kim Janzen (University of Saskatchewan) with soil and vegetation laboratory sample preparation and analyses. We would like to thank the European Research Council (ERC, project GA 335910 VeWa) for funding. The comments from two reviewers greatly improved an earlier version of the manuscript, for which we are highly grateful.

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Using stable isotope data from soil and vegetation xylem samples across a range of landscape positions, this study provides preliminary insights into spatial patterns and temporal dynamics of soil-plant water interactions in a humid, low-energy northern environment. Our analysis showed that evaporative fractionation affected the isotopic signatures in soil water at shallow depths but was less marked than previously observed in other environments. By comparing the temporal dynamics of stable isotopes in soil water mainly held at suctions around and below field capacity, we found that these waters are not clearly separated. The study inferred that vegetation water sources at all sites were relatively constant, and most likely to be in the upper profile close to the soil/atmosphere interface. The data analyses also suggested that both vegetation type and landscape position, including soil type, may have a strong influence on local water uptake patterns, although more work is needed to explicitly identify water sources and understand the effect of plant physiological processes on xylem isotopic water signatures.

AB - Using stable isotope data from soil and vegetation xylem samples across a range of landscape positions, this study provides preliminary insights into spatial patterns and temporal dynamics of soil-plant water interactions in a humid, low-energy northern environment. Our analysis showed that evaporative fractionation affected the isotopic signatures in soil water at shallow depths but was less marked than previously observed in other environments. By comparing the temporal dynamics of stable isotopes in soil water mainly held at suctions around and below field capacity, we found that these waters are not clearly separated. The study inferred that vegetation water sources at all sites were relatively constant, and most likely to be in the upper profile close to the soil/atmosphere interface. The data analyses also suggested that both vegetation type and landscape position, including soil type, may have a strong influence on local water uptake patterns, although more work is needed to explicitly identify water sources and understand the effect of plant physiological processes on xylem isotopic water signatures.

KW - vegetation water use

KW - soil water storage

KW - isotopes

U2 - 10.1016/j.scitotenv.2017.03.275

DO - 10.1016/j.scitotenv.2017.03.275

M3 - Article

VL - 595

SP - 486

EP - 493

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -