Loss and recovery of vegetation productivity in response to extreme drought during 2022 across China DOI Creative Commons
Meng Li, Rui Cui,

L. Wang X.X. Bu

et al.

Ecological Indicators, Journal Year: 2024, Volume and Issue: 166, P. 112358 - 112358

Published: July 22, 2024

Extreme droughts can severely impact terrestrial vegetation productivity. In the summer of 2022, approximately 32.7% China's land area experienced extreme drought conditions, marked by reduced rainfall both in terms amount and intensity, prolonged consecutive dry days, minimal rainy accompanied heat waves. While previous studies have reported productivity losses over half vegetated areas how recover from remains to be clarified. this study, we utilized Enhanced Vegetation Index (EVI), Gross Primary Productivity (GPP) meteorological data evaluate extent pace change loss 2022 post-drought recovery 2023. We also assessed contributions seven variables two drought-related variations regions affected using machine-learning techniques. Our findings revealed that, average EVI GPP were 2.3% 8.0% lower, respectively, compared baseline period 2018 2021. Soil water content (SWC) emerged as primary factor contributing decline EVI/GPP, followed number days for vapor pressure deficit GPP. 2023, observed a significant recovery, with increasing 2.6% rising 14.9% within study 2022. SWC played dominant role displayed non-linear response SWC. Additionally, identified threshold effect on recovery; once increased above certain threshold, would largely rapidly. Furthermore, intensity second most important factors influencing GPP, respectively. underscores significance soil moisture seasonality plant growth.

Language: Английский

Revealing the Exacerbated Drought Stress Impacts on Regional Vegetation Ecosystems in Karst Areas with Vegetation Indices: A Case Study of Guilin, China DOI Open Access

Zijian Gao,

Wen He,

Yuefeng Yao

et al.

Sustainability, Journal Year: 2025, Volume and Issue: 17(3), P. 1308 - 1308

Published: Feb. 6, 2025

Global warming has exacerbated the impact of regional drought on vegetation ecosystems, especially in typical karst areas with fragile ecosystems that are more severely affected by drought. However, response mechanisms to stress still uncertain. With summer 2022, we examined spatiotemporal patterns a World Heritage site, Guilin, China, and revealed impacts various indices. Firstly, analyzed characteristics from 2000 utilizing temperature dryness index (TVDI), highlighting intra-annual variability 2022. Additionally, compared responses different types non-karst explored within same year three indices, namely, Normalized Difference Vegetation Index (NDVI), Leaf Area (LAI), Gross Primary Production (GPP) areas. The results showed started July persisted August November at moderate severe levels (with September), eventually easing December. Karst exhibited (TVDI = 0.76), which significantly impacted than those Different also experienced greater indices increased early- mid-stages (July September) baseline (2020–2021), mainly due increase decreased late stage (October November), primarily decrease areas, indicating topography ecosystems. Since LAI GPP similar changing TVDI, showing particularly strong alignment, they can be used reveal We emphasize importance monitoring climate-induced droughts enhancing their resilience future climatic challenges,

Language: Английский

Citations

0
Why Did the Extreme Drought in the Yangtze River Basin in 2022 Break the 2019 Record? DOI Creative Commons
Linwei Jiang, Wenhao Gao, K. J. Zhu

et al.

Earth and Space Science, Journal Year: 2025, Volume and Issue: 12(3)

Published: March 1, 2025

Abstract This study employs a multi‐faceted approach combining meteorological (Standardized Precipitation‐Evapotranspiration Index (SPEI)), agricultural (Soil Moisture (SM) percentiles), and land‐atmosphere moisture balance principles to comparatively analyze two unprecedented extreme drought events in the traditionally humid Yangtze River Basin during summer autumn of 2019 2022. The results reveal that, although both droughts persisted for roughly 2 months, 2022 event exhibited more abrupt onset greater intensity. Soil levels plummeted below 5%, surpassing severity marking it as most severe regional on record. daily SPEI calculations effectively tracked progression droughts, demonstrating strong correlation with fluctuations SM. followed traditional pattern, developing gradually primarily driven by prolonged precipitation deficits. In contrast, was characterized flash drought, triggered heatwaves under pre‐existing wetter condition, which induced positive feedback loop among high temperatures, increased evaporation, reduced rapid reduction SM further decreased soil heat capacity, exacerbating daytime temperature. budget analysis shows 2019, persistent deficiency stemmed from wind divergence obstructing supply, leading periods local dryness gradual buildup drought. 2022, heat‐induced elevated Evapotranspiration (ET) exacerbated loss, intensifying causing develop rapidly. Moreover, were significantly influenced position strength Western Pacific subtropical (WPSH).

Language: Английский

Citations

0
Dietary Tea Polyphenols Alleviate Acute-Heat-Stress-Induced Death of Hybrid Crucian Carp HCC2: Involvement of Modified Lipid Metabolisms in Liver DOI Creative Commons
Na Zhang, Jun Tao, Qifang Yu

et al.

Metabolites, Journal Year: 2025, Volume and Issue: 15(4), P. 229 - 229

Published: March 27, 2025

Global warming poses significant challenges to aquaculture, as elevated water temperatures adversely affect fish health and survival. This study investigated the effects potential mechanisms of dietary tea polyphenols (TPs) on acute heat stress survival in hybrid crucian carp HCC2. The control (CON) group (HS group, three replicates, each containing 20 fish, n = 60 per group) were fed diets with 0 mg/kg TPs, experimental groups (HSLTP, HSMTP, HSHTP, × 3 replicates) 100, 200, or 400 TPs for days. Further, (HS, HSLTP, HSHTP) exposed at 38 °C 24 h induce stress. Survival data serum tissue samples collected analysis. Metabolomics using UPLC-Q-TOF/MS was employed evaluate metabolite changes livers. Notably, significantly improved rates antioxidant enzyme levels reduced ALT, AST, cortisol, glucose, MDA, liver HSP-70 heat-stressed fish. Metabolomic analysis revealed that modulated lipid metabolism, particularly glycerophospholipid arachidonic acid pathways, which may contribute a higher tolerance These findings suggest are promising, eco-friendly feed additive protecting from optimizing aquaculture practices.

Language: Английский

Citations

0
Extreme Heatwave Affects the Saltwater Intrusion and River Plume Extension in the Changjiang River Estuary DOI

Yezhi Lin,

Yihe Wang, Jianrong Zhu

et al.

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(4)

Published: April 1, 2025

Abstract In 2022, China experienced an extreme hot summer accompanied by record‐breaking droughts. Although extensive attentions have been paid on its influences the urban and watershed systems, how heatwave affects hydrodynamics in marginal seas, which is essential for environment security coastal area, remains unclear. Here this study, we examined effects of Changjiang River Estuary adjacent shelf seas with a numerical model. The results indicated that direct heating over sea has dual both saltwater intrusion into estuary river plume extension. First, strong causes intensified stratification, increasing potential energy anomaly (PEA) value approximately 7%. This weakens vertical mixing, thus maintains low‐salinity surface. Second, contrary, induces evaporation, increases surface salinity. heating‐induced stratification evaporation‐induced salinization are favor stronger estuarine circulation, therefore increase salinity estuary. worsened already severe situation freshwater supplement year. resulted extension, but was overwhelmed salinization. Consequently, area decreased 8.52%. contrast, normal years, precipitation dominates due to heavy rainfall, co‐work precipitation‐induced freshening further enhances study contributes understanding interlinked climate events systems.

Language: Английский

Citations

0
Interannual variations in extreme wet spells and their potential causes in Southwest China DOI
Minggang Li, Yong Zhao,

Yuan Long

et al.

Atmospheric Research, Journal Year: 2025, Volume and Issue: unknown, P. 108194 - 108194

Published: May 1, 2025

Language: Английский

Citations

0
Developing a drought-heatwave cluster projection (DHCP) approach for water shortage areas: A case study in Northwest China DOI

Yingxia Tang,

Guohe Huang,

Wenshu Kuang

et al.

Theoretical and Applied Climatology, Journal Year: 2025, Volume and Issue: 156(6)

Published: May 9, 2025

Language: Английский

Citations

0
Projecting dry-wet abrupt alternation across China from the perspective of soil moisture DOI Creative Commons
Jianxiu Qiu, Chun-Hsuan He,

Xiaoping Liu

et al.

npj Climate and Atmospheric Science, Journal Year: 2024, Volume and Issue: 7(1)

Published: Nov. 2, 2024

Under a warmer climate, the enhancement of dry-wet abrupt alternation (DWAA) risk poses great challenge for sustainable development. Here, we introduce novel framework DWAA detection based on our proposed soil moisture concentration index. By end this century, over humid southern China, shift time series from anomalously wet to dry pattern, or other way around, will be more abrupt. In addition, driven by Coupled Model Intercomparison Project Phase 6 simulations projects widespread DWAA-affected areas southwestern coastal regions southeastern and lower reaches Yangtze River, especially under high emission scenario. The in study provides an efficient system prediction, findings provide reference upgrading hydraulic infrastructure mitigating future events.

Language: Английский

Citations

3
Loss and recovery of vegetation productivity in response to extreme drought during 2022 across China DOI Creative Commons
Meng Li, Rui Cui,

L. Wang X.X. Bu

et al.

Ecological Indicators, Journal Year: 2024, Volume and Issue: 166, P. 112358 - 112358

Published: July 22, 2024

Extreme droughts can severely impact terrestrial vegetation productivity. In the summer of 2022, approximately 32.7% China's land area experienced extreme drought conditions, marked by reduced rainfall both in terms amount and intensity, prolonged consecutive dry days, minimal rainy accompanied heat waves. While previous studies have reported productivity losses over half vegetated areas how recover from remains to be clarified. this study, we utilized Enhanced Vegetation Index (EVI), Gross Primary Productivity (GPP) meteorological data evaluate extent pace change loss 2022 post-drought recovery 2023. We also assessed contributions seven variables two drought-related variations regions affected using machine-learning techniques. Our findings revealed that, average EVI GPP were 2.3% 8.0% lower, respectively, compared baseline period 2018 2021. Soil water content (SWC) emerged as primary factor contributing decline EVI/GPP, followed number days for vapor pressure deficit GPP. 2023, observed a significant recovery, with increasing 2.6% rising 14.9% within study 2022. SWC played dominant role displayed non-linear response SWC. Additionally, identified threshold effect on recovery; once increased above certain threshold, would largely rapidly. Furthermore, intensity second most important factors influencing GPP, respectively. underscores significance soil moisture seasonality plant growth.

Language: Английский

Citations

0