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

Hydrological Processes, Год журнала: 2023, Номер 37(1)

Опубликована: Янв. 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.

Язык: Английский

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The natural abundance of stable water isotopes method may overestimate deep-layer soil water use by trees

Hydrology and earth system sciences, Год журнала: 2023, Номер 27(1), С. 123 - 137

Опубликована: Янв. 4, 2023

Abstract. Stable water isotopes have been used extensively to study the use strategy of plants in various ecosystems. In deep vadose zone (DVZ) regions, rooting depth trees can reach several meters tens meters. However, existence roots soils does not necessarily mean occurrence root uptake, which usually occurs at a particular time during growing season. Therefore, quantifying contribution deep-layer soil (DLSW) DVZ regions using natural abundance stable may be accurate because this method assumes that always extract shallow- and water. We propose multi-step for addressing issue. First, isotopic labeling layers identifies whether absorb DLSW determines layer depths from derive their source. Next, we calculate sources based on determined above quantify trees. also compared results with method. The 11- 17-year-old apple were taken as examples analyses China's Loess Plateau. Isotopic showed uptake 11-year-old reached 300 cm blossom young fruit (BYF) stage only 100 swelling (FSW) stage, whereas consumed 0–320 layer. Overall, absorbed most (>140 cm) BYF more these than throughout addition, overestimated DLSW, especially 320–500 Our findings highlight determining helps regions.

Язык: Английский

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Tree‐ and stand‐scale variability of xylem water stable isotope signatures in mature beech, oak and spruce

Ecohydrology, Год журнала: 2024, Номер 17(2)

Опубликована: Янв. 17, 2024

Abstract In ecohydrology, water isotopologues are used to assess potential sources of root uptake by comparing xylem signatures with source signatures. Such comparisons affected the variability and uncertainty isotope plant sources. The tree‐scale stand‐scale variabilities in stem often unknown but important for sampling design estimation assessing tree uptake. Here, we quantified beech, oak spruce trees a mature forest on Swiss plateau. For water, sub‐daily replicates different cardinal directions showed no systematic differences, found differences height. observed at heights along suggests that residence times within need be considered, their effects compartments (stem, branches, leaves). Further, concerning hydrogen signatures, height‐ species‐specific offsets (SW‐excess δ 2 H). Stem water's was similar magnitude its smaller than branch bulk soil around each tree. Xylem from cores close ground, therefore, can give more precise estimate isotopic signal most recent facilitate accurate attribution.

Язык: Английский

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Vapour pressure deficit and solar radiation are the major drivers of transpiration in montane tropical secondary forests in eastern Madagascar

Agricultural and Forest Meteorology, Год журнала: 2022, Номер 326, С. 109159 - 109159

Опубликована: Сен. 26, 2022

Язык: Английский

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Illuminating isotopic offset between bulk soil water and xylem water under different soil water conditions

Agricultural and Forest Meteorology, Год журнала: 2022, Номер 325, С. 109150 - 109150

Опубликована: Сен. 2, 2022

Язык: Английский

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Evidence for variations in cryogenic extraction deuterium biases of plant xylem water across foundational northeastern US trees

Hydrological Processes, Год журнала: 2024, Номер 38(2)

Опубликована: Фев. 1, 2024

Abstract Measurements of oxygen and hydrogen isotopes in plant xylem water ( 2 H, 18 O) have helped to redefine conceptual numerical models the hydrological cycle understand how plants compete for subsurface water. Recent experiments shown that Cryogenic Vacuum Extraction (CVE) can result a δ H bias. We tested if CVE H‐biases varied significantly across seven foundational northeastern US forest trees with series tree core rehydration experiments. Our analysis demonstrated were well predicted by sample gravimetric content species identity. show species‐level H‐bias corrections substantially different understandings uptake transpiration versus uncorrected data or generic bias corrections. This research demonstrates an urgent need critical evaluation extraction. In absence stronger understanding H‐biases, we recommend observations should not be used studies.

Язык: Английский

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Analyzing water uptake of apple trees using isotopic techniques in the Shandong Peninsula, China

Journal of Hydrology Regional Studies, Год журнала: 2025, Номер 57, С. 102153 - 102153

Опубликована: Янв. 5, 2025

Язык: Английский

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Injected Tracer Reveals Differences in Water Transport Rate, Residence Times and Mixing Dynamics in Tree Species of Contrasting Water Management Strategies

Hydrological Processes, Год журнала: 2025, Номер 39(3)

Опубликована: Фев. 26, 2025

ABSTRACT Studies have shown that water can reside inside trees for up to several months, but how the duration of long‐term stored relates species‐specific management strategies is not known. We studied residence time, tracer velocity, and internal mixing in two tree species with differing by injecting deuterated into Douglas fir ( Pseudotsuga menziesii ) trembling aspen Populus tremuloides then monitoring concentration daily leaves weeks postinjection. In a companion study, we injected collected at subdaily timescales explore patterns arrival canopy leaves. For first experiment, hypothesised would remain both days longer time more isohydric trees. explored if arrive sharp peak, or be spread out over time. The resided 7–11 species. Interestingly, reached sooner yet remained compared fir, which exhibited pulses breakthrough canopies. Surprisingly, aspens occurred distinct pulses, separated 1–2 days. Combined, results from experiments suggest may flow simple ‘in‐up‐and‐out’ (i.e., piston flow) ways complex reservoirs paths occur some

Язык: Английский

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Sub‐Daily Variations in Tree Xylem Water Isotopic Compositions in a Temperate Northeastern US Forest

Hydrological Processes, Год журнала: 2025, Номер 39(4)

Опубликована: Апрель 1, 2025

ABSTRACT Sampling of stable isotopes in plant xylem water (δ 2 H, δ 18 O) has become a ubiquitous technique to study spatiotemporal variations the taken up by roots; however, open questions remain concerning most appropriate time day sample trees obtain representative isotopic values XYLEM ). We sampled oak and maple prior solar midday (i.e., recommended sampling window) then again after outside across 4 months. The paired root mean squared difference between AM PM O ranged from 1.00‰ 1.16‰ for maples 0.23‰ 2.55‰ oaks all dates. Xylem seasonal origin index (SOI) derived samples were significantly different, though both SOI estimates supported conclusion that reflected summer precipitation on conclude is significant consideration design campaigns; our findings also support flexibility collection field sites where during optimal challenging.

Язык: Английский

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Ephemeral connectivity between trees and groundwater in a temperate forest in China

Journal of Hydrology, Год журнала: 2022, Номер 610, С. 127887 - 127887

Опубликована: Апрель 30, 2022

Язык: Английский

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