Mineral mediated isotope fractionation of soil water

Gaj, Marcel; Kaufhold, Stephan; Koeniger, Paul; Beyer, Matthias; Weiler, Markus; Himmelsbach, Thomas

doi:10.1002/rcm.7787

Cited by 79 publications

(110 citation statements)

References 41 publications

(58 reference statements)

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“…This equation can be rearranged to calculate the amount of soil water (Equation ) and the isotopic composition of soil water (Equation ), respectively:

{amount}_{soil water} = \frac{{amount}_{Mix} \times italici . italicc ._{Mix} - {amount}_{spike} \times italici . italicc ._{spike}}{italici . italicc ._{soil water}}

italici . italicc ._{soil water} = \frac{{amount}_{Mix} \times italici . italicc ._{Mix} - {amount}_{spike} \times italici . italicc ._{spike}}{italicamount ._{soil water}}

Underlying the above calculation is the approximation that the water remaining in the soil after oven drying has the same isotopic composition as the water extracted from fresh soil, an assumption which is expected to be false, but necessary, as no other better information on its isotopic composition is available. Due to this approximation, the result of this calculation is not precise.…”

Section: Methodssupporting

confidence: 92%

“…It is unclear whether the exchange effect is in fact only due to exchange with residual soil water, or perhaps also due to exchange with the soil matrix (clay minerals, organic matter). Our results indicate that the amount of exchange is different for O and H which would indicate that matrix effects (which always only act for one element) are in play.…”

Section: Discussionmentioning

confidence: 99%

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Effects of soil‐bound water exchange on the recovery of spike water by cryogenic water extraction

Thielemann

Gerjets

Dyckmans

2019

Rapid Comm Mass Spectrometry

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Rationale The effects that alter the isotopic composition of water added to soil samples that have been oven‐dried previously are not fully understood. Methods Oven‐dried clay‐rich soil was repeatedly rewetted with two waters of strongly differing isotopic composition. This approach allowed the determination of the amount and the isotopic composition of soil‐bound water that exchanges with spike water after rewetting. Results After oven drying, 1.8% and 1.4% water (gravimetric content) exchanged with the added spike water, for δ2H and δ18O values, respectively. The isotopic composition of this soil residual water was depleted by 89.7 mUr and 5.42 mUr relative to the water extracted from field‐fresh soil for H and O, respectively. The cryogenic extraction method was more efficient than oven drying in terms of water removal from soil. Conclusions Our results show that the isotopic difference between extractable (mobile) water and non‐extractable (soil‐bound) water explains the isotopic effects observed in spike water experiments. This difference, however, can also lead to a considerable isotopic offset between extractable and total soil water.

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“…This equation can be rearranged to calculate the amount of soil water (Equation ) and the isotopic composition of soil water (Equation ), respectively:

{amount}_{soil water} = \frac{{amount}_{Mix} \times italici . italicc ._{Mix} - {amount}_{spike} \times italici . italicc ._{spike}}{italici . italicc ._{soil water}}

italici . italicc ._{soil water} = \frac{{amount}_{Mix} \times italici . italicc ._{Mix} - {amount}_{spike} \times italici . italicc ._{spike}}{italicamount ._{soil water}}

Section: Methodssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Effects of soil‐bound water exchange on the recovery of spike water by cryogenic water extraction

Thielemann

Gerjets

Dyckmans

2019

Rapid Comm Mass Spectrometry

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“…This accordance indicates that δ soil reflected water pools available for RWU for a wide range of Ψ. Additionally, δ soil below 20 cm depth and deionised water used for initial saturation agreed well before phase II. Therefore, no measurable tension‐ and texture‐mediated isotopic effect (Orlowski et al , , ; Gaj et al , ) was found in this study. For the soil used in the present experiment, this also contradicts the recently controversially discussed hypothesis of two water worlds (McDonnell, ) that explains observed differences between plant and stream water isotopic compositions by conceptualising the co‐existence of two isotopically distinct water pools, one available for RWU and one available for soil water flow.…”

Section: Resultscontrasting

confidence: 55%

Investigating the root plasticity response of Centaurea jacea to soil water availability changes from isotopic analysis

et al. 2020

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Summary Root water uptake is a key ecohydrological process for which a physically based understanding has been developed in the past decades. However, due to methodological constraints, knowledge gaps remain about the plastic response of whole plant root systems to a rapidly changing environment. We designed a laboratory system for nondestructive monitoring of stable isotopic composition in plant transpiration of a herbaceous species (Centaurea jacea) and of soil water across depths, taking advantage of newly developed in situ methods. Daily root water uptake profiles were obtained using a statistical Bayesian multisource mixing model. Fast shifts in the isotopic composition of both soil and transpiration water could be observed with the setup and translated into dynamic and pronounced shifts of the root water uptake profile, even in well watered conditions. The incorporation of plant physiological and soil physical information into statistical modelling improved the model output. A simple exercise of water balance closure underlined the nonunique relationship between root water uptake profile on the one hand, and water content and root distribution profiles on the other, illustrating the continuous adaption of the plant water uptake as a function of its root hydraulic architecture and soil water availability during the experiment.

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“…These effects include water isotopologue organization and partitioning at interfaces with organic material adsorbed to soil particle surfaces (Chen, Auerswald, & Schnyder, 2016), or around cations adsorbed to the clay particle surfaces (Oerter et al, 2014), or by the soil mineral particles themselves (Gaj et al, 2017). These effects include water isotopologue organization and partitioning at interfaces with organic material adsorbed to soil particle surfaces (Chen, Auerswald, & Schnyder, 2016), or around cations adsorbed to the clay particle surfaces (Oerter et al, 2014), or by the soil mineral particles themselves (Gaj et al, 2017).…”

Section: Soil and Xylem Water δ 2 H And δ 18 O Valuesmentioning

confidence: 99%

In situ monitoring of H and O stable isotopes in soil water reveals ecohydrologic dynamics in managed soil systems

2017

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The water cycle in urban and hydrologically managed settings is subject to perturbations that are dynamic on small spatial and temporal scales; the effects of which may be especially profound in soils. We deploy a membrane inlet-based laser spectroscopy system in conjunction with soil moisture and temperature sensors to monitor soil water dynamics and H and O stable isotope ratios (δ 2 H and δ 18 O values) in a seasonally irrigated urban-landscaped garden soil over the course of 9 months between the cessation of irrigation in the autumn and the onset of irrigation through the summer. We find that soil water δ 2 H and δ 18 O values predominately reflect seasonal precipitation and irrigation inputs. A comparison of total soil water by cryogenic extraction and mobile soil water measured by in situ water vapor probes reveals that initial infiltration events after long periods of soil drying (the autumn season in this case) emplace water into the soil matrix that is not easily replaced by, or mixed with, successive pulses of infiltrating soil water.Tree stem xylem water H and O stable isotope composition did not match that of available water sources. These findings suggest that partitioning of soil water into mobile and immobile "pools" and resulting ecohydrologic separation may occur in engineered and hydrologically managed soils and not be limited to natural settings. The laser spectroscopy method detailed here has potential to yield insights in a variety of critical zone and vadose zone studies, potential that is heightened by the simplicity and portability of the system.

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Mineral mediated isotope fractionation of soil water

Cited by 79 publications

References 41 publications

Effects of soil‐bound water exchange on the recovery of spike water by cryogenic water extraction

Effects of soil‐bound water exchange on the recovery of spike water by cryogenic water extraction

Investigating the root plasticity response of Centaurea jacea to soil water availability changes from isotopic analysis

In situ monitoring of H and O stable isotopes in soil water reveals ecohydrologic dynamics in managed soil systems

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