Heterogeneity in vegetation recovery rates post-flash droughts across different ecosystems

Environmental Research Letters, Год журнала: 2024, Номер 19(7), С. 074028 - 074028

Опубликована: Июнь 7, 2024

Abstract Flash droughts, as sub-seasonal phenomena, are characterized by their rapid onset and significant impact on terrestrial ecosystems. However, understanding how vegetation responds to flash droughts the mechanisms governing recovery remains elusive. Here, we analysed response of productivity identified most relevant drivers controlling using two soil moisture datasets (ERA5-land Global Land Data Assimilation System) satellite-based proxies (gross primary productivity, solar-induced chlorophyll fluorescence). Our results show that South China Northeast stand out hotspots for with higher frequency speed. Notably, although in cropland is relatively low, speed very high, a median 10.9% per pentad. Most ecosystems can recover normal state within 25 d. Vegetation shallow roots, such grassland, rapidly droughts. Ecosystems generally exhibit extended time increasing plant rooting depth. The rate from mainly controlled physiology (decline upon exposure drought) modulated drought characteristics, especially severity forests grassland. This study provides valuable insights into underlying responses

Язык: Английский

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Characteristics, water quality, health risks and sources of heavy metals of Qu River Basin

Journal of Geochemical Exploration, Год журнала: 2025, Номер 271, С. 107676 - 107676

Опубликована: Янв. 12, 2025

Язык: Английский

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Quantifying future water and energy security in the source area of the western route of China’s South-to-North water diversion project within the context of climatic and societal changes

Journal of Hydrology Regional Studies, Год журнала: 2023, Номер 47, С. 101443 - 101443

Опубликована: Июнь 1, 2023

Yalong River Basin (YLRB), China. The YLRB was selected to investigate the impacts of climatic and societal changes on water energy security in water-diverting area China's South-to-North diversion project (SNWD-W). future runoff hydropower generation were projected using Watergap hydrological model (WGHM) under different Representative Concentration Pathway (RCP) scenarios withdrawals predicted based shared socio-economic pathways (SSPs). results show that display significant increasing decreasing trends RCP8.5 RCP2.6, respectively. stress index (WSI) is increase by about 30%, but it still lower than 0.2 even combined with SNWD-W project. change − 0.87–4.75% 0.44–6.10% RCP2.6 without diversion, slight increment caused climate cannot offset substantial decrement especially maximum transfer amount scenario, which highlights tradeoffs between mitigation water-receiving loss area. Our provide a valuable reference for resources administration design scheme SNWD-W.

Язык: Английский

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Multiscale Nonlinear Response of Extreme Meteorological–Hydrothermal Events in the Upper Reaches of the Yangtze River

Ecohydrology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

ABSTRACT Under the backdrop of climate warming, outbreak short‐term extreme heat events can easily lead to irreversible changes in aquatic ecosystems. Delving into their intrinsic driving mechanisms and nonlinear characteristics is key preventing natural disasters. This study, focusing on upper Yangtze River as research area, constructs a joint copula function model analyze occurrence probability return period meteorological events. Through bivariate cross–wavelet transform method, study explores multiscale dynamic response relationships phase meteorological–hydrothermal River. Furthermore, multifractal responses for was established. The results indicate that high‐heat tend occur more frequently severely, with duration–kurtosis likely coincide within 2‐year period, well high‐intensity low‐frequency duration–severity occurring simultaneously. Overall, before 2005, high‐hydrothermal exhibited lagging behind changes, which then shifted from lag lead. three scenarios change, exhibit clear relationship. Apart duration, severity kurtosis all show significant relationships.

Язык: Английский

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Divergent Trends of Open Surface Water Body Area of River and Lake Dominated Regions in the Yangtze River Basin from 1986 to 2022

Remote Sensing, Год журнала: 2025, Номер 17(6), С. 1008 - 1008

Опубликована: Март 13, 2025

Anthropogenic and climatic stresses threaten water security across the Yangtze River Basin (YZRB), which safeguards population economic development that is responsible for nearly half China’s GDP. Understanding trends drivers of open surface in YZRB crucial yet remains poorly investigated. This study proposes a new method to eliminate shadow impacts on extraction, achieving 96% accuracy, develops long-term dataset from 1986 2022 using Landsat imagery Google Earth Engine platform. Trends area changes were analyzed source region, typical river lake dominated regions YZRB, partial least squares regression was used attribute major anthropogenic change. The results show generally increased by 39.88%, with divergent regions. Source both exhibited notable growths 49.43% 37.01%, respectively. Increases region comes lakes rivers, driven increasing temperature precipitation permafrost regions, while increases come permanent induced construction mega dams. Changes body are mainly influenced seasonal varied trends. Poyang Dongting have decreasing area, 3354.24 2168.82 km2 1504.79 850.47 km2, respectively, attributed impoundment Three Gorges Reservoir alterations patterns. While Tai Lake experienced an increase 2003 due expanded bodies, it followed decline after urbanization. We therefore suggest systematically optimizing reservoir dispatching land–water configurations balance economic, societal, environmental benefits.

Язык: Английский

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From fragmentation to consolidation: An integrated approach for multidimensional analysis of water security in Langat River Basin, Malaysia

Environmental Science & Policy, Год журнала: 2025, Номер 169, С. 104067 - 104067

Опубликована: Апрель 25, 2025

Язык: Английский

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Quantifying the Regulation Capacity of the Three Gorges Reservoir on Extreme Hydrological Events and Its Impact on Flow Regime in a Changing Climate

Water Resources Research, Год журнала: 2024, Номер 60(6)

Опубликована: Июнь 1, 2024

Abstract The Three Gorges Reservoir (TGR) is one of the world's largest hydropower projects and plays an important role in water resources management Yangtze River. For sake disaster prevention catchment management, it crucial to understand regulation capacity TGR on extreme hydrological events its impact flow regime a changing climate. This study obtains historical inflows from 1961 2019 uses distributed model simulate future 2021 2070. These data are adopted drive machine learning‐based operation obtain simulated outflow with operation, which then compared natural without assess TGR. results indicate that average flood peaks total flooding days period could have been reduced by 29.2% 53.4% relative declines drought indicators including duration intensity were generally less than 10%. Faced more severe future, still expected alleviate floods droughts, but cannot bring them down levels. will also evolve climate, potentially altering habitats river ecosystems. proposes feasible methods for simulating large reservoirs quantifying regime, provides insights integrated watershed upper River basin.

Язык: Английский

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Per- and Poly-Fluoroalkyl Substances, and Organophosphate Flame Retardants in the Upper Yangtze River: Occurrence, Spatiotemporal Distribution, and Risk Assessment

Toxics, Год журнала: 2025, Номер 13(2), С. 116 - 116

Опубликована: Фев. 1, 2025

Contaminants of Emerging Concern (CECs), including per- and polyfluoroalkyl substances (PFASs) organophosphate flame retardants (OPFRs), have raised global concerns due to their persistence, bioaccumulation potential, toxicity. This study presents a comprehensive investigation the occurrence, spatiotemporal distribution, potential sources, ecological human health risks associated with 18 PFASs 9 OPFRs in surface waters upper Yangtze River, China. The water samples were collected from main stream five major tributaries (Min, Jinsha, Tuo, Jialing, Wu Rivers) 2022 2023. total concentration ranged 16.07 927.19 ng/L, 17.36 190.42 respectively, consistently higher observed compared tributaries. Ultra-short-chain (e.g., TFMS) halogenated TCPP) predominant compounds, likely originating industrial discharges, wastewater effluents, other anthropogenic sources. Ecological risk assessments indicated low-to-moderate at most sampling sites, near discharge points. Human evaluations suggested negligible non-carcinogenic but identified carcinogenic OPFR exposure for adults specific locations, particularly Leshan city. highlights importance understanding fate impacts provides valuable insights developing targeted pollution control strategies management measures.

Язык: Английский

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Inferring causal associations in hydrological systems: a comparison of methods

Stochastic Environmental Research and Risk Assessment, Год журнала: 2025, Номер unknown

Опубликована: Апрель 16, 2025

Язык: Английский

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Comparison of vegetation responses to diverse water sources in the Yangtze River Basin: Insights from meteorological, hydrological, and agricultural drought

Ecological Indicators, Год журнала: 2025, Номер 175, С. 113524 - 113524

Опубликована: Апрель 26, 2025

Язык: Английский

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