Inferring the seasonal origins of the plant (Cinnamomum camphora) and soil water from precipitation by stable isotope techniques in the East Asian monsoon region

Journal of Hydrology Regional Studies, Год журнала: 2024, Номер 52, С. 101690 - 101690

Опубликована: Фев. 3, 2024

From 2017 to 2019, xylem and leaf samples of Cinnamomum camphora were sampled soil water at 0–100 cm depth 65 times simultaneously in a typical East Asian monsoon region. The seasonal origin plant from precipitation was inferred based on the stable isotope techniques, including evaporation line slope (SEL) estimations index (SOI) calculation. regression SEL close theoretical SELs estimated Craig–Gordon model, but showed higher than SELs, this may be due seasonality isotopes evaporative fractionation. fractionation-compensated isotopic values calculated different types close, with differences within 2.4‰ for δ18O 20.0‰ δ2H each other, uncertainty low enough calculation SOI. SOI results that summer more prevalent water, winter recharge runoff when evapotranspiration demand is weak. Overall, sampling method have potential infer over relatively long period.

Язык: Английский

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Assessing the impact of drought on water cycling in urban trees via in-situ isotopic monitoring of plant xylem water

Journal of Hydrology, Год журнала: 2024, Номер 633, С. 131020 - 131020

Опубликована: Март 6, 2024

Urban trees are an integral part of sustainable cities. They regulate the local microclimate and enhance urban water cycle. Increasing periods drought can impair by affecting their uptake, transpiration growth patterns. In this study, we used a multi-proxy approach to assess how non-irrigated react changing supply throughout full vegetative period 2022 including major in Berlin, Germany. Our work focused on individual mature green space; examining daily mean in-situ isotopes plant xylem (δxyl) while also monitoring vegetation dynamics via sap flow, stem increments, LAI, as well groundwater, soil moisture at different depths. The was characterised spring with average precipitation inputs, followed extremely dry from July until mid-August, then gradual rewetting end August October. At beginning growing period, changes ecohydrological investigated maple birch were high increases size but decreasing moisture. spring, δxyl signatures both trees, effect more marked hinting dependence species specific-storage effects distinct start transpiration. During summer, stress apparent fluxes monitored reduction growth, midday potential Yet flow rates relatively stable tree maintained. We noted midsummer enrichment species. Most importantly, measured isotopically range deep waters groundwater implying that deeper sources sustaining trees' during drought. detected fractionation δxyl, which is possibly induced heterogenous uptake strategies biochemical processes xylem, CH4 transport. results suggest rely internal storage conclude shrubs shallow root development would be vulnerable summers particular threat future accelerated summer droughts combined insufficient autumn causing layers out.

Язык: Английский

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Species and biosynthetic effects cause uncorrelated variation in oxygen and hydrogen isotope compositions of plant organic compounds

Geochimica et Cosmochimica Acta, Год журнала: 2023, Номер 352, С. 1 - 13

Опубликована: Апрель 26, 2023

Strong variation in plant organic compound δ2H and δ18O values such as leaf waxes or cellulose among species is commonly observed; however, the extent to which this isotopic driven by water biochemical isotope effects relatively unknown. Therefore, we compared (cellulose - δ18O, n-alkanes – δ2H) across 192 grown a botanical garden assess covariation of (1) between elements given compound, (2) different (organic) compounds element, (3) growing seasons. Our results suggest that are likely not strong driver for observed species, may also be true values. Furthermore, even though correlation appears transferred compounds, explanatory power strongly diminished (R2 < 0.04). This indicates additional fractionation leads substantial possibly species. Moreover, low n-alkane = 0.06) suggests pathways associated with accompanied effects. Lastly, appeared sensitive environmental differences seasons, while model-predicted source climate were negligible years. By contrast, pattern was highly conserved two forcing on equal compounds. conclude (and δ18O) seasons more rather than water. should considered application reconstruct past climate, where invariable often assumed. Alternatively, could further developed into tool extract metabolic information.

Язык: Английский

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A Fully Coupled Numerical Solution of Water, Vapor, Heat, and Water Stable Isotope Transport in Soil

Water Resources Research, Год журнала: 2025, Номер 61(1)

Опубликована: Янв. 1, 2025

Abstract Modeling water stable isotope transport in soil is crucial to sharpen our understanding of cycles terrestrial ecosystems. Although several models for have been developed, many rely on a semi‐coupled numerical approach, solving only after obtaining solutions from and heat equations. However, this approach may increase instability errors model. Here, we developed an algorithm that solves one‐dimensional water, heat, equations with fully coupled method (MOIST). Our results showed MOIST more under various spatial temporal discretization than has good agreement semi‐analytical transport. We also validated long‐term measurements lysimeter study three scenarios hydraulic parameters calibrated by HYDRUS‐1D the first two last scenario. In scenario 1, overall NSE , KGE MAE simulated δ 18 O 0.47, 0.58, 0.92‰, respectively, compared 0.31, 0.60, 1.00‰ HYDRUS‐1D; 2, these indices were 0.33, 0.52, 1.04‰, 0.19, 1.15‰ 3, exhibited highest (0.48) (0.76), smallest (0.90) among all scenarios. These findings indicate better performance simulating flow simplified ecosystems HYDRUS‐1D, suggesting great potential furthering understandings ecohydrological processes

Язык: Английский

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Key role of ambient temperature in modulating leaf water isotopic enrichment seasonality in a humid subtropical climate

Agricultural and Forest Meteorology, Год журнала: 2025, Номер 368, С. 110561 - 110561

Опубликована: Апрель 14, 2025

Язык: Английский

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Mapping leaf water isotopes across China using precipitation isotope and climate data

Journal of Hydrology, Год журнала: 2025, Номер unknown, С. 133545 - 133545

Опубликована: Май 1, 2025

Язык: Английский

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Organic contamination detection for isotopic analysis of water by laser spectroscopy

Rapid Communications in Mass Spectrometry, Год журнала: 2021, Номер 35(15)

Опубликована: Май 3, 2021

Rationale Hydrogen and oxygen stable isotope ratios (δ 2 H, δ 17 O, 18 O values) are commonly used tracers of water. These can be measured by ratio infrared spectroscopy (IRIS). However, IRIS approaches prone to errors induced organic compounds present in plant, soil, natural water samples. A novel approach using O‐excess values has shown promise for flagging spectrally contaminated plant samples during analysis. systematic assessment this system is needed prove it useful. Methods Errors methanol ethanol mixtures on mass spectrometry (IRMS) results were evaluated. For analyses both liquid‐ vapour‐mode (via direct vapour equilibration) methods used. The compared with known reference determine the contamination. In addition, contamination detection was tested. This a post‐processing tool liquid triple‐isotope analyses, utilizing calculated flag Results Organic significant results, not seen IRMS results. Methanol caused larger than ethanol. from vapour‐IRIS had those liquid‐IRIS analyses. identified driven error at levels where became unacceptably erroneous. samples, mix erroneous correct occurred method. Our indicate that more problematic contaminant data corruption. method therefore useful quality control. Conclusions highly sensitive detecting narrowband (methanol) analysis modes IRIS.

Язык: Английский

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Study on recharge source and influence mechanism of plant water in the Three-River Headwaters Region, China

Journal of Hydrology, Год журнала: 2023, Номер 618, С. 129180 - 129180

Опубликована: Янв. 28, 2023

Язык: Английский

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A bioavailable strontium (87Sr/86Sr) isoscape for Aotearoa New Zealand: Implications for food forensics and biosecurity

PLoS ONE, Год журнала: 2022, Номер 17(3), С. e0264458 - e0264458

Опубликована: Март 16, 2022

As people, animals and materials are transported across increasingly large distances in a globalized world, threats to our biosecurity food security rising. Aotearoa New Zealand is an island nation with many endemic species, strong local agricultural industry, need protect these from pest threats, as well the economy fraudulent commodities. Mitigation of such much more effective if their origins pathways for entry understood. We propose that this may be addressed using strontium isotope analysis both pests products. Bioavailable radiogenic isotopes ubiquitous markers provenance used trace origin plants products, but currently baseline map lacking, preventing use technique. Here, we have improved existing methodology develop regional bioavailable isoscape best available geospatial datasets Aotearoa. The explains 53% variation (R 2 = 0.53 RMSE 0.00098) region, which primary drivers underlying geology, soil pH, aerosol deposition (dust sea salt). tested potential model determine cow milk produced Predictions (n 33) highlighted all locations share similar 87 Sr/ 86 Sr values, closest predictions averaging 7.05 km away true place origin. These results demonstrate tracing locally products Accordingly, it could certify Aotearoa’s while also helping new detections were breeding populations or not, raise awareness imported illegal

Язык: Английский

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Toward a Closure of Catchment Mass Balance: Insight on the Missing Link From a Vegetated Lysimeter

Water Resources Research, Год журнала: 2022, Номер 58(4)

Опубликована: Март 25, 2022

Abstract Plant transpiration plays a significant role in the terrestrial cycles, but spatiotemporal origins of water used by plant remains highly uncertain. Therefore, missing link to fully characterize mass balance, for any control volume including vegetated surfaces, is identifying and quantifying key factors that age plants. Here, we bring together an age‐based ( tran ‐SAS) physically based (HYDRUS‐1D) model contrasting information gleaned from soil, drainage, xylem samples at stand scale. In particular, focus on relative advection, dispersion, root distribution uptake drainage. We suggest interplay advective dispersive forces, subsumed local Péclet number, drives composition drainage even case extreme rates. The vegetation influence mainly exerted diversifying subsurface transport pathways resulting large dispersivity spatial heterogeneity soil hydraulic parameters. introduce uniform‐equivalent length show its ratio effective size storage controls selection uptakes. Our results are suggestive route forward toward general toolbox upscale balance closures catchments embedding diverse assemblages.

Язык: Английский

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