Increased crossing of thermal stress thresholds of vegetation under global warming
Li, Xiangyi; Huntingford, Chris 
ORCID: https://orcid.org/0000-0002-5941-7770; Wang, Kai; Cui, Jiangpeng; Xu, Hao; Kan, Fei; Anniwaer, Nazhakaiti; Yang, Hui; Peñuelas, Josep; Piao, Shilong.
2024
Increased crossing of thermal stress thresholds of vegetation under global warming.
Global Change Biology, 30 (7), e17406.
15, pp.
10.1111/gcb.17406
Abstract/Summary
Temperature extremes exert a significant influence on terrestrial ecosystems, but the precise levels at which these extremes trigger adverse shifts in vegetation productivity have remained elusive. In this study, we have derived two critical thresholds, using standard deviations (SDs) of growing-season temperature and satellite-based vegetation productivity as key indicators. Our findings reveal that, on average, vegetation productivity experiences rapid suppression when confronted with temperature anomalies exceeding 1.45 SD above the mean temperature during 2001–2018. Furthermore, at temperatures exceeding 2.98 SD above the mean, we observe the maximum level of suppression, particularly in response to the most extreme high-temperature events. When Earth System Models are driven by a future medium emission scenario, they project that mean temperatures will routinely surpass both of these critical thresholds by approximately the years 2050 and 2070, respectively. However, it is important to note that the timing of these threshold crossings exhibits spatial variation and will appear much earlier in tropical regions. Our finding highlights that restricting global warming to just 1.5°C can increase safe areas for vegetation growth by 13% compared to allowing warming to reach 2°C above preindustrial levels. This mitigation strategy helps avoid exposure to detrimental extreme temperatures that breach these thresholds. Our study underscores the pivotal role of climate mitigation policies in fostering the sustainable development of terrestrial ecosystems in a warming world.
| Item Type: | Publication - Article |
|---|---|
| Digital Object Identifier (DOI): | 10.1111/gcb.17406 |
| UKCEH and CEH Sections/Science Areas: | Hydro-climate Risks (Science Area 2017-) |
| ISSN: | 1354-1013 |
| Additional Keywords: | temperature extremes, thresholds, vegetation productivity, compound events, future projection, climate mitigation policies |
| NORA Subject Terms: | Ecology and Environment Meteorology and Climatology |
| Related URLs: | |
| Date made live: | 23 Jul 2024 12:10 +0 (UTC) |
| URI: | https://nora.nerc.ac.uk/id/eprint/537747 |
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