The influence of hydrometeorological factors on tree growth in mountainous watersheds of the Qilian mountains in China

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Апрель 23, 2025

To examine the influence of hydrometeorological factors on forest ecosystems, this study focused growth response Qinghai spruce (Picea crassifolia Kom.) to factors, such as soil moisture, relative humidity, vapor pressure deficit, temperature, precipitation and wind speed, in a mountainous watershed. The Dayekou watershed, which is situated Qilian Mountains, was used increase stem diameter based daily-monthly fluctuations, cumulative growth, expansion parameters. diameters six dominant trees (categorized three classes) were recorded using Dendrometer DRL26 tree monitor combined with monitoring data. statistically analyzed. results indicated that daily fluctuation exhibited parabolic pattern, could be divided into stages: contraction (from 10:00 21:00), expanding 21:00 5:00 following day), 11:00 day). monthly also trend, initial (May), rapid (June-July) slow (August-October). At 40 cm depth, water content, air atmospheric all showed positive correlations (P < 0.01), while saturated differential, photosynthetically active radiation negative 0.01). Our demonstrated at depth had highest impact spruce's diameter. Changes these due potential climate change will affect future.

Язык: Английский

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Partitioning the Causes of Spatial Variation in Transpiration of Larch (Larix gmelinii var. principis-rupprechtii (Mayr) Pilg) Plantations Between Lower and Upper Positions on a Semiarid Slope in Northwest China

Forests, Год журнала: 2025, Номер 16(5), С. 767 - 767

Опубликована: Апрель 30, 2025

This study aimed to understand the difference in forest transpiration (T) between slope positions and separate contributions of main influencing factors improve accuracy estimation at scale by up-scaling results measured plot scale, especially semiarid regions with significant soil moisture differences along positions. Two plots larch plantation were established, one lower position another upper a northwest-facing area Liupan Mountains northwest China. The sap flow velocity (JS, mL·cm−2·min−1) sample trees, meteorological parameters open field, water potential root zone (0–60 cm) monitored simultaneously growing season (from July September) 2015. However, only data 59 selected effective days used, after excluding rainfall missing data. Based on relative (the ratio instantaneous its daily peak value), impacts terrain shading varying quantitatively disentangled. reduction JS plot, attributed shading, exhibited positive linear correlation solar radiation intensity. Conversely, demonstrated quadratic functional relationship differential two plots. Subsequently, employing whereby is equivalent product sapwood area, we conducted quantitative analysis potential, their interaction disparity total was 41.91 mm slightly higher than that (37.38 mm), indicating small (4.53 mm) due offsetting effects multiple factors. When taking as reference, increased for 16.40 mm, while three decreased 6.61, 2.86, 2.40 respectively, making net increase 4.53 mm. pilot under given conditions location, soil, climate, vegetation, stand slopes are follows: (soil potential) > structure (sapwood area) (terrain shading) all All these should be considered accurate prediction through from measurement regions.

Язык: Английский

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One year of high-frequency monitoring of groundwater physico-chemical parameters in the Weierbach experimental catchment, Luxembourg

Earth system science data, Год журнала: 2025, Номер 17(5), С. 2217 - 2229

Опубликована: Май 27, 2025

Abstract. The critical zone (CZ) is the skin of Earth, where rock, water, air, and life interact, playing a pivotal role in sustaining ecological processes life-supporting resources. Understanding these interactions, especially forested headwater catchments, essential to manage water resources, predict environmental responses, assess human impacts. Here, we present novel dataset from Weierbach experimental catchment Luxembourg, derived year-long high-frequency monitoring campaign focused on groundwater physico-chemical parameters. Through rigorous data collection quality control, parameters such as electrical conductivity, dissolved oxygen, oxidation–reduction potential, pH were measured, providing insights into CZ's hydrological biogeochemical dynamics. Although 1-year offers valuable observations, it represents an initial step toward understanding long-term patterns. highlight interaction between redox reactions, pH, seasonal variability, although interpretations are limited by temporal scope study. By offering detailed snapshot response variations, this contributes addressing key gaps CZ research serves foundation for advancing our hydro-biogeochemical at scale. Despite observation period, provides that can be integrated with efforts. Researchers practitioners use refine models, inform land management decisions, improve biogeochemistry catchment. available https://doi.org/10.5281/zenodo.10869166 (Hissler et al., 2024).

Язык: Английский

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Discharge, Groundwater Gradients, and Streambed Micro‐Topography Control the Temporal Dynamics of Transient Storage in a Headwater Reach

Water Resources Research, Год журнала: 2023, Номер 59(7)

Опубликована: Июнь 26, 2023

Abstract Contradictory interpretations of transient storage modeling (TSM) results past studies hamper the understanding how hydrologic conditions control solute transport in streams. To address this issue, we conduct 30 instantaneous tracer experiments Weierbach stream, Luxembourg. Using an iterative approach, calibrate TSM parameters and assess their identifiability across various conditions. Near‐stream groundwater monitoring wells LIDAR scans streambed are used to evaluate area hyporheic zone submerged sediments for each experiment. Our findings show that increasing discharge enhances interaction requiring more samples obtain identifiable results. also indicate at study site is influenced by in‐stream exchange processes during low discharge, likely due zone's large extent relatively water level compared size slate fragments on streambed. However, as increases, zones become part advective channel lower localized stream losses adjacent suggests a decrease storage. The obtained were utilized generate hydrograph illustrating dynamic evolution with varying providing insights into expected influence different prior experiments. Overall, our role helps estimate accurately.

Язык: Английский

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Water use of co‐occurring loblolly (Pinus taeda) and shortleaf (Pinus echinata) in a loblolly pine plantation in the Piedmont

JAWRA Journal of the American Water Resources Association, Год журнала: 2024, Номер 60(4), С. 897 - 911

Опубликована: Июнь 14, 2024

Abstract Measuring water use in co‐occurring loblolly pine ( Pinus taeda L.) and shortleaf echinata Mill.) enhances our understanding of their competitive aids refining watershed budget model parameters. This study was conducted a 12‐ha forested headwater catchment the Piedmont North Carolina, southeastern U.S., from 2018 to 2019 (pre‐thinning) 2020 (post‐thinning). Sap flux density J s ), species‐level transpiration T watershed‐level w ) were quantified. Water efficiency (WUE) pines compared, alongside an investigation into how both species' responded atmospheric vapor pressure deficit (VPD). Loblolly had 19%–36% higher than pine. Daily for ranged 15.0 29.0 L/day while 3.0 6.8 L/day. The significantly when compared likely due canopy position growth rates former. WUE, defined by annual tree biomass per use, not different between two. species nonlinearly VPD, with being more sensitive variable. Species‐specific should be considered quantifying developing reliable models predict effects forest management practices on resources.

Язык: Английский

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Snowmelt and subsurface heterogeneity control tree water sources in a subalpine forest

Ecohydrology, Год журнала: 2024, Номер 17(7)

Опубликована: Июль 17, 2024

Abstract In high mountain areas, snowmelt water is a key—yet fading—hydrological resource, but its importance for soil recharge and tree root uptake understudied. these environments, heterogeneous terrains enhance highly variable availability of groundwater resources that can be accessed by plants. We conducted tracer‐based study on subalpine forest in the Italian Alps. investigated isotopic composition ( 2 H 18 O) snowmelt, precipitation, spring water, water—at different locations depths—and xylem twigs taken from alpine larch, Swiss stone pine alpenrose plants during bi‐weekly field campaigns (growing seasons 2020 2021). Mixing models based δ O revealed large contribution to particularly early summer. depths using sap flow records date back end‐member signatures. found flexible use shallow deeper plants, with more likely used larger trees late Results data were combined geophysical observations subsurface structure develop conceptual model about exploitation depending their location (shallow slope vs. saturated area). Our highlights relevance high‐elevation terrestrial ecosystems, where substrates shape at and, turn,

Язык: Английский

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Modeling habitat suitability of Quercus castaneifolia in the Hyrcanian forest: a comprehensive integration of environmental factors for conservation insights

Biodiversity and Conservation, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 17, 2024

Язык: Английский

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Comparing hydrological responses across catchments using a new soil water content metric

Hydrological Processes, Год журнала: 2023, Номер 37(10)

Опубликована: Окт. 1, 2023

Abstract Soil water content (SWC) is a fundamental variable involved in several hydrological processes governing catchment functioning. Comparative analysis of different catchments based on SWC data therefore beneficial to infer driving factors response. Here, we explored the use high‐temporal resolution three forested (2.4–60 ha) European climates characterize responses during wet and dry conditions. The investigated systems include Ressi, Italy, with humid temperate climate, Weierbach, Luxembourg, semi‐oceanic Can Vila, Spain, Mediterranean climate. We introduced new metric defined as difference between seasonal mean at relatively shallow deep soil layer. classified distinct states: similar two layers, higher deeper layer, In most site, frequently found depths which was associated high runoff ratios. Despite precipitation amounts Vila patterns were very both catchments. across entire profile conditions, whereas evaporation resulted layer This led ratios conditions low consistently compared irrespective season, suggesting an important role hydraulic redistribution vertical movement this site. Our approach provides easy useful method assess differences behaviour solely data. As datasets are increasingly collected available, opens possibility for further analyses comparisons sites around globe contrasted physiographic climate characteristics.

Язык: Английский

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Chronic warming and dry soils limit carbon uptake and growth despite a longer growing season in beech and oak

PLANT PHYSIOLOGY, Год журнала: 2023, Номер 194(2), С. 741 - 757

Опубликована: Окт. 24, 2023

Abstract Progressively warmer and drier climatic conditions impact tree phenology carbon cycling with large consequences for forest balance. However, it remains unclear how individual impacts of warming soils differ from their combined effects species interactions modulate responses. Using mesocosms, we assessed the multiyear continuous air lower soil moisture alone or in combination on phenology, leaf-level photosynthesis, nonstructural carbohydrate concentrations, aboveground growth young European beech (Fagus sylvatica L.) Downy oak (Quercus pubescens Willd.) trees. We further tested (in monocultures mixtures) modulated these effects. Warming prolonged growing season both but reduced oak. In contrast, did not assimilation species. Combined single Under conditions, performances were enhanced mixtures compared to monocultures. Our work revealed that higher temperature have contrasting vs. growth, former being driven by latter moisture. Furthermore, showed a compensation negative chronic heat drought interactions.

Язык: Английский

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Exploring tracer information in a small stream to improve parameter identifiability and enhance the process interpretation in transient storage models

Hydrology and earth system sciences, Год журнала: 2022, Номер 26(23), С. 6003 - 6028

Опубликована: Дек. 2, 2022

Abstract. The transport of solutes in river networks is controlled by the interplay processes such as in-stream solute and exchange water between stream channel dead zones, sediments, adjacent groundwater bodies. Transient storage models (TSMs) are a powerful tool for testing hypotheses related to streams. However, model parameters often do not show univocal increase performances certain parameter range (i.e. they non-identifiable), leading an unclear understanding controlling In this study, we increased identifiability set tracer breakthrough experiments combining global analysis dynamic iterative approach. We compared our results inverse modelling approaches (OTIS-P) commonly used random sampling approach TSMs (OTIS-MCAT). Compared OTIS-P, informed about entire feasible range. Our clearly improved standard OTIS-MCAT application, due progressive reduction investigated with iteration. Non-identifiable led retention times zone flow differences up 4 2 orders magnitude identifiable respectively. clear metrics obtained from proposed classic also resulted contrasting interpretations hydrologic headwater western Luxembourg. Thus, outcomes point risks interpreting TSM when even one non-identifiable. showed that coupling TSMs. results, was effective at obtaining higher accuracy evaluated metrics, which advancing hydrological control transport.

Язык: Английский

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