Divergent impacts of seasonal precipitation deficiency on grassland growth in drylands of Central Asia

Environmental Research Letters, Journal Year: 2024, Volume and Issue: 19(10), P. 104027 - 104027

Published: Aug. 13, 2024

Abstract Water availability and its timing are essential for determining dryland dynamics, grasslands in Central Asia particularly vulnerable to water provided by precipitation. Climate change is projected alter the seasonal distribution of precipitation patterns increase frequency extreme events. Little known about response deficiency (PD), especially considering time lag effect. Here, we evaluated impacts PD on grassland growth at scale based normalized difference vegetation index (NDVI). Our findings showed that during spring was mostly affected arid regions, with occurring nongrowing season causing mean standardized anomalies (SAs) −0.83 −0.54, respectively, NDVI. In semiarid subhumid summer caused not only largest negative (with SAs −0.94 −0.80 respectively) but also autumn (−0.80 −0.74). had a less adverse effect growth. The divergent responses primarily stemmed from shifts dominant factors influencing across seasons. reduced soil moisture summer, which turn However, through carryover results highlighted importance suggested previous should receive more attention when relationship between scale.

Language: Английский

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Increasing drought sensitivity of plant photosynthetic phenology and physiology

Ecological Indicators, Journal Year: 2024, Volume and Issue: 166, P. 112469 - 112469

Published: Aug. 13, 2024

Language: Английский

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Impacts of Extreme Droughts on Ecosystem Water Use Efficiency Diverge between Forest and Grassland

Journal of Meteorological Research, Journal Year: 2023, Volume and Issue: 37(5), P. 710 - 721

Published: Oct. 1, 2023

Language: Английский

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Contrary responses of soil heterotrophic and autotrophic respiration to spring and summer drought in alfalfa on the Loess Plateau

Geoderma, Journal Year: 2023, Volume and Issue: 440, P. 116722 - 116722

Published: Nov. 30, 2023

Climate change has increased the intensity and frequency of seasonal droughts, which could fundamentally affect terrestrial carbon (C) cycle. However, as second-largest C flux, soil respiration (Rs) its heterotrophic (Rh) autotrophic (Ra) components in response to drought are unclear. To investigate effect on patterns mechanisms Rs components, a two-year continuous measurement experiment was conducted typical rain-fed managed alfalfa (Medicago sativa L.) fields Loess Plateau China. The results showed that ranges Rs, Rh Ra four seasons were 0.45–3.70, 0.13–2.27, 0.33–2.14 μmol m−2 s−1, respectively. There no significant difference average annual between two years (P > 0.05). Both spring summer droughts significantly decreased Rs; however, had different under droughts. Spring reduced by 35.19 % but 20.35 %. In contrast, 45.51 35.05 differential attributed opposite responses leaf area index (LAI) photosynthetic rate drought, while related contrasting microorganism pulse rainfall following drought. Our study highlights relative contribution Rs. These suggest future increases may accelerate turnover further stability stocks semi-arid regions.

Language: Английский

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Upscaling net ecosystem CO2 exchanges in croplands: The application of integrating object-based image analysis and machine learning approaches

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 944, P. 173887 - 173887

Published: June 12, 2024

Language: Английский

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