Impacts of Extreme Drought Events at Different Phenophases on the Aboveground Net Primary Productivity (Anpp) and its Photosynthetic Physiological Regulatory Process of Artemisia Ordosica

Опубликована: Янв. 1, 2025

Climate change has intensified the frequency of extreme drought events in desert ecosystems, accompanied by uneven distribution annual precipitation. Whether precipitation at different phenophases have equivalent impacts on plants is an unverified topic, yet it crucial for understanding mechanisms vegetation adaptation to changes This study focuses typical plant Artemisia ordosica and employs situ control experiments using rain shelters simulate (30 consecutive days removal) three phenophases: sprouting stage, vegetative growth flowering fruiting stage. Against this backdrop, phenological differences leaf photosynthetic physiological regulatory that affect accumulation Aboveground Net Primary Productivity (ANPP) A. under were explored, including parameters such as gas exchange, chlorophyll fluorescence, antioxidant enzymes. The findings reveal that: (1) Extreme markedly reduced photosynthesis leaves, subsequently leading significantly reduction ANPP (p<0.05). With impact degree ordered follows: stage > stage; (2) During events, experiences a decrease exchange capacity enhancement water use efficiency, which are stomatal responses. Additionally, there increase thermal dissipation, decline photochemical activity (such potential PSII, initial light energy conversion actual quantum yield, quenching), augmentation enzyme system, non-stomatal responses; (3) phenophases, dominant factor rate leaves regulation. However, sensitivity regulation during more sensitive compared other phenophases. Non-stomatal most with heightened modulation fluorescence. reveals response offering innovative perspective ecological ecosystems face climate change.

Язык: Английский

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A high resolution, gridded product for vapor pressure deficit using Daymet

Scientific Data, Год журнала: 2025, Номер 12(1)

Опубликована: Фев. 12, 2025

Язык: Английский

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Using Low-Cost Proximal Sensing Sensors for Detecting the Water Status of Deficit-Irrigated Orange Orchards in Mediterranean Climatic Conditions

Agronomy, Год журнала: 2025, Номер 15(3), С. 550 - 550

Опубликована: Фев. 24, 2025

Water scarcity in the Mediterranean significantly affects sustainability of citrus cultivation eastern Sicily, a key production area Italy. Innovative monitoring approaches are crucial for assessing water status and applying precise irrigation strategies. This study evaluates potential low-cost proximal sensors based on thermal infrared (TIR) (e.g., canopy temperature, Tc; ΔT; crop stress index, CWSI) visible near-infrared (VNIR) normalized difference vegetation NDVI) data, combined with stem (SWP), determining proxies across four fields under different regimes (full irrigation, FI, deficit DI) cultivar/rootstock combinations. Temporal spatial differences were detected most variables during season. A 6% decrease NDVI corresponded to higher Tc values July (up 37.6 °C). CWSI highlighted cumulative deficits, reaching 0.65 ± 0.15 September. More negative SWP (−1.91 0.38 MPa) found DI compared FI (−1.70 0.17 conditions. Microclimatic influenced ΔT, lower 3–4, despite site-specific SWP, NDVI, variations. The use VNIR TIR tools provided valuable insights describing temporal variability indicators conditions, supporting their sustainable management.

Язык: Английский

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Widespread Sensitivity of Vegetation to the Transition From Normal Droughts to Flash Droughts

Geophysical Research Letters, Год журнала: 2025, Номер 52(6)

Опубликована: Март 16, 2025

Abstract Global climate change has intensified flash droughts, which differ from traditional and have significant ecological impacts. However, differences in ecosystem responses to normal droughts China remain unclear, particularly terms of vegetation vulnerability resilience. Using a three‐dimensional clustering method, we identified disparities between these drought types 1982 2022 found that developed 40% faster than but caused more severe damage. With the transition sensitivity increased. Shapley's additive interpretation assessed role each environmental factor recovery. The results show characteristics drive resilience vegetation, whereas temperature vapor pressure deficit become significant. These insights provide deeper understanding tolerance under changing climatic conditions.

Язык: Английский

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Research Progress on the Effect of Drought Stress on the Photosynthetic Capacity of Broad-Leaved Woody Plants

World Journal of Forestry, Год журнала: 2025, Номер 14(02), С. 126 - 133

Опубликована: Янв. 1, 2025

Язык: Английский

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A pronounced decline in northern vegetation resistance to flash droughts from 2001 to 2022

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Март 27, 2025

Climate change has led to the transition of droughts into rapid and intensified phenomena known as flash droughts, presenting considerable challenges for risk management, particularly concerning their impact on ecosystem productivity. Quantifying ecosystem's capacity maintain productivity during referred resistance, is crucial assess drought impacts. However, it remains uncertain how resistance changes over time. Here we show that vegetation declines by up 27% (±5%) Northern Hemisphere hotspots 2001-2022, including eastern Asia, western North America, northern Europe. The notable decline in mainly attributed increased vapour pressure deficit temperature, enhanced structural sensitivity water availability. Flash pose higher ecological risks than slowly-developing growing seasons, where experiences faster rates with a shorter response Our results underscore limited resist under climate change. More frequent rapid-onset "flash droughts", threaten stability warming climate. This study shows hemisphere been increasingly sensitive declining since early 2000s.

Язык: Английский

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Impacts of Extreme Drought Events at Each Phenophase on the Aboveground Net Primary Productivity and Its Photosynthetic Physiological Regulatory Process of Sandy Semi-shrubs

Plant Physiology and Biochemistry, Год журнала: 2025, Номер unknown, С. 109914 - 109914

Опубликована: Апрель 1, 2025

Язык: Английский

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Rapid changes in terrestrial carbon dioxide uptake captured in near-real time from a geostationary satellite: The ALIVE framework

Remote Sensing of Environment, Год журнала: 2025, Номер 324, С. 114759 - 114759

Опубликована: Апрель 14, 2025

Язык: Английский

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Causal Discovery Analysis Reveals Global Sources of Predictability for Regional Flash Droughts

Water Resources Research, Год журнала: 2024, Номер 60(11)

Опубликована: Ноя. 1, 2024

Abstract Detecting and quantifying the global teleconnections with flash droughts (FDs) understanding their causal relationships is crucial to improve predictability. This study employs effect networks (CENs) explore predictability sources of subseasonal soil moisture FDs in three regions United States (US): upper Mississippi, South Atlantic Gulf (SAG), lower Colorado river basins. We analyzed FD events 2‐m air temperature, sea surface water deficit (precipitation minus evaporation), geopotential height at 500 hPa weekly timescale over warm season (April September) from 1982 2018. CENs revealed that Indian Ocean Dipole, Pacific North patterns, Bermuda high‐pressure system, teleconnection patterns via Rossby wave train jet streams strongly influence these regions. Moreover, a strong link America suggests atmospheric circulation forcings could affect SAG through low‐level flow, reducing inland transport, leading precipitation deficit. Machine learning utilizing identified factors can well predict major up 4 weeks advance, providing useful insights for improved forecasting early warnings.

Язык: Английский

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Rapid Changes in Terrestrial Carbon Dioxide Uptake Captured in Near-Real Time from a Geostationary Satellite: The Alive Framework

Опубликована: Янв. 1, 2024

Язык: Английский

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