Drought reduces water uptake in beech from the drying topsoil, but no compensatory uptake occurs from deeper soil layers

New Phytologist, Journal Year: 2021, Volume and Issue: 233(1), P. 194 - 206

Published: Oct. 7, 2021

The intensity and frequency of droughts events are projected to increase in future with expected adverse effects for forests. Thus, information on the dynamics tree water uptake from different soil layers during after drought is crucial. We applied an situ isotopologue monitoring system determine oxygen isotope composition xylem European beech a 2-h resolution together measurements content, transpiration deficit. Using Bayesian mixing model, we inferred relative absolute contribution four use. Beech took up more than 50% its uppermost 5 cm layer at beginning 2018 drought, but then reduced drying topsoil by 84%. trees were not able quantitatively compensate restricted availability additional deeper layers, which related fine root depth distribution. Absolute was restored pre-drought levels within 3 wk rewetting. These patterns help explain both sensitivity high recovery potential release.

Language: Английский

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Toward a common methodological framework for the sampling, extraction, and isotopic analysis of water in the Critical Zone to study vegetation water use

Wiley Interdisciplinary Reviews Water, Journal Year: 2024, Volume and Issue: 11(4)

Published: March 5, 2024

Abstract The analysis of the stable isotopic composition hydrogen and oxygen in water samples from soils plants can help to identify sources vegetation uptake. This approach requires that heterogeneous nature plant soil matrices is carefully accounted for during experimental design, sample collection, extraction analyses. comparability shortcomings different methods extracting analyzing have been discussed specialized literature. Yet, despite insightful comparisons benchmarking methodologies laboratories worldwide, community still lacks a roadmap guide extraction, analyses, many practical issues potential users remain unresolved: example, which (soil or plant) pool(s) does extracted represent? These constitute hurdle implementation by newcomers. Here, we summarize discussions led framework COST Action WATSON (“WATer isotopeS critical zONe: groundwater recharge transpiration”—CA19120). We provide guidelines (1) sampling material analysis, (2) laboratory situ (3) measurements composition. highlight importance considering process chain as whole, design minimize biased estimates relative contribution conclude acknowledging some limitations this methodology advice on collection key environmental parameters prior article categorized under: Science Water > Hydrological Processes Environmental Change Extremes

Language: Английский

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On the urgent need for standardization in isotope‐based ecohydrological investigations

Hydrological Processes, Journal Year: 2022, Volume and Issue: 36(10)

Published: Sept. 12, 2022

Abstract Ecohydrological investigations commonly use the stable isotopes of water (hydrogen and oxygen) as conservative ecosystem tracers. This approach requires accessing analysing from plant soil matrices. Generally, there are six steps involved to retrieve hydrogen oxygen isotope values these matrices: (1) sampling, (2) sample storage transport, (3) extraction, (4) pre‐analysis processing, (5) isotopic analysis, (6) post‐processing correction. At each step, cumulative errors can be introduced which sum non‐trivial magnitudes. These impact subsequent interpretations about cycling partitioning through soil–plant‐atmosphere continuum. steps, multiple possible options select resulting in tens thousands combinations used by researchers go samples data. In a newly emerging field, so many create interpretive confusion major issues with data comparability. points need for development shared standardized approaches. Here we critically examine state process chain, reflecting on associated provide suggestions move our community towards standardization. Assessing this ‘process chain’ will help us see problem its entirety facilitate action agreed upon

Language: Английский

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Flushing or mixing? Stable water isotopes reveal differences in arctic forest and peatland soil water seasonality

Hydrological Processes, Journal Year: 2023, Volume and Issue: 37(1)

Published: Jan. 1, 2023

Abstract Understanding the relative importance of different water sources that replenish soil storage is necessary to assess vulnerability sub‐arctic areas changes in climate and altered rain snow conditions, reflected timing magnitude infiltration. We examine spatiotemporal variability seasonal origin at soil‐vegetation interface Pallas catchment, located northern Finland. The field study was conducted from May 2019 June 2020 over two snowmelt seasons one summer growing season. sampled cores up a 1‐m depth stem dominant tree species four sites forests forested peatlands for stable isotopes. Seasonal rainfall variation late events were well identifiable well‐drained soils areas, while this input signal heavily attenuated wetter, peatland areas. Spatiotemporal forest similar, whereas controlled by extent hydrologic connectivity adjoining pools. A mixture both winter precipitation present during entire period, mineral showed an ephemeral response got nearly fully flushed twice hydrological year. Meltwater after early spring but became displaced isotopically enriched summer. evolution pools not dynamics offset between isotopic signals less pronounced peatlands. This data set uncovered high depth‐resolution, quantifying replenishing sustaining conditions.

Language: Английский

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Partitioned Soil Water Balance and Its Link With Water Uptake Strategy Under Apple Trees in the Loess‐Covered Region

Water Resources Research, Journal Year: 2022, Volume and Issue: 59(1)

Published: Dec. 20, 2022

Abstract It is important, but challenging, to partition soil water balance (SWB) understand the impacts of afforestation on hydrological processes. This study will investigate partitioning SWB by combining stable and radioactive isotopes quantify effects afforestation, analyze mechanism which changes through identifying uptake strategies apple trees 18 26 years old (A18 A26). Compared reference farmland, orchards significantly increased evapotranspiration (ET) 5%–10%, in turn decreased storage deep drainage 5%–14% 50%–95%, respectively. Further, ET showed that tree planting transpiration 15%–28% evaporation 17%–30%. The above change appeared be closely related plant strategies. shifted their source from shallow (0–2 m) soils (below 2 m), utilizing approximately 62% late growing season. In particular, 23% may come older than 50 years. tended extract more deeper (45% for A26 vs. 38% A18). Therefore, deficit was cumulative root uptake. methods provides technical support similar studies, findings are helpful better processes thick loess deposition.

Language: Английский

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Progress and challenges in dual‐ and triple‐isotope (δ¹⁸O, δ²H, Δ¹⁷O) analyses of environmental waters: An international assessment of laboratory performance

Rapid Communications in Mass Spectrometry, Journal Year: 2021, Volume and Issue: 35(24)

Published: Sept. 7, 2021

Rationale Stable isotope analyses of environmental waters ( δ 2 H, 18 O) are an important assay in hydrology and research with rising interest 17 O, which requires ultra‐precise assays. We evaluated six test water samples for 281 laboratory submissions measuring H O along a subset analyzing Δ by laser spectrometry ratio mass (IRMS). Methods Six were distributed to laboratories spanning wide range natural O. One sample was blind duplicate reproducibility claims analytical precision. Results showed that ca 83% the produced acceptable results within 0.2‰ (mUr) 1.6‰ benchmark values, respectively. However, 17% gave questionable unacceptable results. A revealed many reported overly optimistic precision, could not replicate their claimed For dual‐inlet IRMS using quantitative conversion accurate highly precise, but ranged 200 per meg (μUr) each sample, 70% unable complicating factor is lack certified primary reference Conclusions No single or combination factors identifiable poor good performance, underperformance came from issues like data normalization including inadequate memory drift corrections, compromised working materials underperforming instrumentation. recommend include high low value controls known composition run. Progress extraordinary proof performance would benefit development adoptable systematic advanced processing procedures correct drift.

Language: Английский

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Links of apple tree water uptake strategies with precipitation and soil water dynamics in the deep loess deposits

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 623, P. 129829 - 129829

Published: June 20, 2023

Language: Английский

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Improved Methods for High Precision Isotope‐Ratio Infrared Laser Spectroscopy of Ecohydrological Waters With Organic Contaminants

Rapid Communications in Mass Spectrometry, Journal Year: 2025, Volume and Issue: 39(14)

Published: April 21, 2025

ABSTRACT Rationale Applications of high‐precision isotope analysis ecohydrological water samples such as soil and plant waters with infrared (IR) laser spectrometry have been hampered by spectral interferences volatile organic compounds. Methods In this study, three methods were tested to remove methanol (MeOH) and/or ethanol (EtOH) added for δ 2 H, 18 O, 17 O‐excess Picarro L2140‐i: microcombustion module (MCM), pre‐treatment solid‐phase extraction (SPE), simple MeOH/EtOH combustion (SMEC) method. Results The MCM was not able combust the alcohols high concentrations. Hydrophilic–lipophilic balanced (HLB) SPE could adsorb at low concentrations (e.g., 0.1% EtOH). However, its adsorption capacity be readily exhausted, adsorbed on adsorbents co‐elutes mix a sample water. SMEC can successfully highly concentrated (0.5% MeOH 1% EtOH) 450–500 °C, but alcohol oxygen exchange O significantly increase values (up 6–7‰) decrease 110 per meg) in presence catalyst. combination post‐analysis corrections data (δ H O) method O‐excess) reach accuracy precision ≤3 ≤2 ‰ H), ≤0.2 ≤0.3‰ O), ≤20 ≤47 meg ( O‐excess), respectively. Conclusions A strategy combining two is proposed contaminated samples: O‐excess). improved study provide sufficient waters, which contribute fields ecohydrology agricultural sciences.

Language: Английский

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Two common pitfalls in the analysis of water‐stable isotopologues with cryogenic vacuum extraction and cavity ring‐down spectroscopy

Analytical Science Advances, Journal Year: 2024, Volume and Issue: 5(3-4)

Published: Jan. 25, 2024

Water stable isotopologue analysis is widely used to disentangle ecohydrological processes. Yet, there are increasing reports of measurement uncertainties for established and emerging methods, such as cryogenic vacuum extraction (CVE) or cavity ring-down spectroscopy (CRDS). With this study, we investigate two pitfalls, that potentially contribute in water-stable research. To fractionation sources CVE, extracted pure water known isotopic composition with cotton, glass wool without cover compared the results non-extracted reference samples. characterise dependency δ

Language: Английский

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Triple oxygen isotope variability of precipitation in a tropical mountainous region

Geochimica et Cosmochimica Acta, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 1, 2024

Language: Английский

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