Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1913072116 |
The impact of rising CO2 and acclimation on the response of US forests to global warming | |
John S. Sperry; Martin D. Venturas; Henry N. Todd; Anna T. Trugman; William R. L. Anderegg; Yujie Wang; and Xiaonan Tai | |
2019 | |
发表期刊 | Proceedings of the National Academy of Sciences of the United States of America |
ISSN | 0027-8558 |
出版年 | 2019 |
卷号 | 116期号:51页码:25734-25744 |
语种 | 英语 |
英文摘要 | AbstractThe response of forests to climate change depends in part on whether the photosynthetic benefit from increased atmospheric CO2 (∆Ca = future minus historic CO2) compensates for increased physiological stresses from higher temperature (∆T). We predicted the outcome of these competing responses by using optimization theory and a mechanistic model of tree water transport and photosynthesis. We simulated current and future productivity, stress, and mortality in mature monospecific stands with soil, species, and climate sampled from 20 continental US locations. We modeled stands with and without acclimation to ∆Ca and ∆T, where acclimated forests adjusted leaf area, photosynthetic capacity, and stand density to maximize productivity while avoiding stress. Without acclimation, the ∆Ca-driven boost in net primary productivity (NPP) was compromised by ∆T-driven stress and mortality associated with vascular failure. With acclimation, the ∆Ca-driven boost in NPP and stand biomass (C storage) was accentuated for cooler futures but negated for warmer futures by a ∆T-driven reduction in NPP and biomass. Thus, hotter futures reduced forest biomass through either mortality or acclimation. Forest outcomes depended on whether projected climatic ∆Ca/∆T ratios were above or below physiological thresholds that neutralized the negative impacts of warming. Critically, if forests do not acclimate, the ∆Ca/∆T must be above ca. 89 ppm⋅°C−1 to avoid chronic stress, a threshold met by 55% of climate projections. If forests do acclimate, the ∆Ca/∆T must rise above ca. 67 ppm⋅°C−1 for NPP and biomass to increase, a lower threshold met by 71% of projections. |
英文关键词 | acclimation climate change drought forest resilience vegetation modeling |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/232542 |
专题 | 地球科学 资源环境科学 气候变化 |
推荐引用方式 GB/T 7714 | John S. Sperry,Martin D. Venturas,Henry N. Todd,et al. The impact of rising CO2 and acclimation on the response of US forests to global warming[J]. Proceedings of the National Academy of Sciences of the United States of America,2019,116(51):25734-25744. |
APA | John S. Sperry.,Martin D. Venturas.,Henry N. Todd.,Anna T. Trugman.,William R. L. Anderegg.,...&and Xiaonan Tai.(2019).The impact of rising CO2 and acclimation on the response of US forests to global warming.Proceedings of the National Academy of Sciences of the United States of America,116(51),25734-25744. |
MLA | John S. Sperry,et al."The impact of rising CO2 and acclimation on the response of US forests to global warming".Proceedings of the National Academy of Sciences of the United States of America 116.51(2019):25734-25744. |
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