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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Empirical and process-based models predict enhanced beech growth in European mountains under climate change scenarios: A multimodel approach

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 888, P. 164123 - 164123

Published: May 13, 2023

Language: Английский

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Unenriched xylem water contribution during cellulose synthesis influenced by atmospheric demand governs the intra‐annual tree‐ring δ¹⁸O signature

New Phytologist, Journal Year: 2023, Volume and Issue: 240(5), P. 1743 - 1757

Published: Sept. 27, 2023

The oxygen isotope composition (δ18 O) of tree-ring cellulose is used to evaluate tree physiological responses climate, but their interpretation still limited due the complexity fractionation pathways. We assessed relative contribution seasonal needle and xylem water δ18 O variations intra-annual signature larch trees at two sites with contrasting soil availability in Swiss Alps. combined biweekly measurements water, twig cellulose, xylogenesis analysis, mechanistic structural equation modeling. Intra-annual values resembled source mean levels better than O. Large parts rings were formed under high proportional exchange unenriched (pex ). Maximum pex achieved August imprinted on sections 50-75% ring. High associated periods atmospheric evaporative demand (VPD). While VPD governed variability, we estimated a Péclet effect both sites. Due variable , has strong influence over large variations, potentially masking signals coming from needle-level processes.

Language: Английский

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

Ecohydrology, Journal Year: 2024, Volume and Issue: 17(2)

Published: Jan. 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.

Language: Английский

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Snow-melt water: An important water source for Picea crassifolia in Qilian Mountains

Journal of Hydrology, Journal Year: 2022, Volume and Issue: 613, P. 128441 - 128441

Published: Sept. 13, 2022

Language: Английский

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