Widespread consistent but rapid response of terrestrial ecosystem photosynthesis and respiratory to drought

Journal of Hydrology, Год журнала: 2025, Номер unknown, С. 133107 - 133107

Опубликована: Март 1, 2025

Язык: Английский

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Global Critical Drought Thresholds of Terrestrial Carbon Sink–Source Transition

Global Change Biology, Год журнала: 2025, Номер 31(3)

Опубликована: Март 1, 2025

ABSTRACT Drought is considered a major contributor to carbon sink fluctuations in terrestrial ecosystems and expected lead more frequent sink–source transitions under future climate change. The drought threshold for transition reflects the critical inflection point at which sequestration capacity of vegetation affected by water deficit. However, spatiotemporal patterns global their underlying mechanisms remain poorly understood. Here, we use three independent datasets from dynamics models, inversion modeling, observational data map explore thresholds expressed standardized precipitation evapotranspiration index (SPEI) during growing season over past four decades. Sink–source indicated changes sign net ecosystem productivity (NEP). were identified across 66.3% land, with an average −1.08 ± 0.68. Regions lower are primarily located Northern Hemisphere middle high latitudes, whereas Australia, Africa, western South America, southern North America exhibit higher thresholds. dominant factor influencing spatial pattern potential evapotranspiration. Our dynamic results show that 36.4% increased, while 55.8% decreased. We found disproportionate decreases photosynthesis respiration caused led decreased increased resilience this region. Under conditions reduced soil moisture, radiation, vapor pressure deficit, enhanced heatwave intensity, had greater effect on reducing than it did respiration. This resulted increasing trend, where even relatively low levels can induce transition. In addition, CO 2 fertilization plays role mitigating findings emphasize risk acute regions rising implies stability these may decrease persistent stress.

Язык: Английский

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Prediction of Drought Thresholds Triggering Winter Wheat Yield Losses in the Future Based on the CNN-LSTM Model and Copula Theory: A Case Study of Henan Province

Agronomy, Год журнала: 2025, Номер 15(4), С. 954 - 954

Опубликована: Апрель 14, 2025

As global warming progresses, quantifying drought thresholds for crop yield losses is crucial food security and sustainable agriculture. Based on the CNN-LSTM model Copula function, this study constructs a conditional probability framework under future climate change. It analyzes relationship between Standardized Precipitation–Evapotranspiration Index (SPEI) winter wheat yield, assesses vulnerability of in various regions to stress, quantifies The results showed that (1) SPEI Zhoukou, Sanmenxia, Nanyang was significantly correlated with yield; (2) southern eastern higher than center, western, northern past (2000–2023) (2024–2047); (3) there were significant differences thresholds. loss below 30, 50, 70 percentiles (past/future) −1.86/−2.47, −0.85/−1.39, 0.60/0.35 (Xinyang); −1.45/−2.16, −0.75/−1.34, −0.17/−0.43 (Nanyang); −1.47/−2.24, −0.97/−1.61, 0.69/0.28 (Zhoukou); −2.18/−2.86, −1.80/−2.36, −0.75/−1.08 (Kaifeng), indicating threshold will reduce future. This mainly due different soil conditions Henan Province. In context change, droughts be more frequent. Hence, research provide valuable reference efficient utilization agricultural water resources prevention control risk change

Язык: Английский

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Study on the propagation processes and driving mechanisms of meteorological, hydrological, and agricultural droughts on the Mongolian Plateau

Journal of Hydrology, Год журнала: 2025, Номер unknown, С. 133511 - 133511

Опубликована: Май 1, 2025

Язык: Английский

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Dcswinlstm: A Fusion Method on Multiscale Spatiotemporal Meteorological Drought Prediction

Опубликована: Янв. 1, 2025

Язык: Английский

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