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Continuous in situ measurements of water stable isotopes in soils, tree trunk and root xylem: Field approval

Kuehnhammer, Kathrin and Dahlmann, Adrian and Iraheta, Alberto and Gerchow, Malkin and Birkel, Christian and Marshall, John D and Beyer, Matthias (2022). Continuous in situ measurements of water stable isotopes in soils, tree trunk and root xylem: Field approval. Rapid Communications in Mass Spectrometry. 36 :5 , e9232
[Research article]

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Abstract

Rationale New methods to measure stable isotopes of soil and tree water directly in the field enable us to increase the temporal resolution of obtained data and advance our knowledge on the dynamics of soil and plant water fluxes. Only few field applications exist. However, these are needed to further improve novel methods and hence exploit their full potential. Methods We tested the borehole equilibration method in the field and collected in situ and destructive samples of stable isotopes of soil, trunk and root xylem water over a 2.5-month experiment in a tropical dry forest under natural abundance conditions and following labelled irrigation. Water from destructive samples was extracted using cryogenic vacuum extraction. Isotope ratios were determined with IRIS instruments using cavity ring-down spectroscopy both in the field and in the laboratory. Results In general, timelines of both methods agreed well for both soil and xylem samples. Irrigation labelled with heavy hydrogen isotopes clearly impacted the isotope composition of soil water and one of the two studied tree species. Inter-method deviations increased in consequence of labelling, which revealed their different capabilities to cover spatial and temporal heterogeneities. Conclusions We applied the novel borehole equilibration method in a remote field location. Our experiment reinforced the potential of this in situ method for measuring xylem water isotopes in both tree trunks and roots and confirmed the reliability of gas permeable soil probes. However, in situ xylem measurements should be further developed to reduce the uncertainty within the range of natural abundance and hence enable their full potential.

Authors/Creators:Kuehnhammer, Kathrin and Dahlmann, Adrian and Iraheta, Alberto and Gerchow, Malkin and Birkel, Christian and Marshall, John D and Beyer, Matthias
Title:Continuous in situ measurements of water stable isotopes in soils, tree trunk and root xylem: Field approval
Series Name/Journal:Rapid Communications in Mass Spectrometry
Year of publishing :2022
Volume:36
Number:5
Article number:e9232
Number of Pages:19
Publisher:WILEY
ISSN:0951-4198
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
URN:NBN:urn:nbn:se:slu:epsilon-p-116348
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116348
Additional ID:
Type of IDID
DOI10.1002/rcm.9232
Web of Science (WoS)000759654400004
ID Code:27293
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:10 Mar 2022 17:25
Metadata Last Modified:10 Mar 2022 17:31

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