The uncertain role of rising atmospheric CO2 on global plant transpiration

被引:27
|
作者
Vicente-Serrano, Sergio M. [1 ]
Miralles, Diego G. [2 ]
McDowell, Nate [3 ,4 ]
Brodribb, Tim [5 ]
Dominguez-Castro, Fernando [6 ,7 ]
Leung, Ruby [3 ]
Koppa, Akash [2 ]
机构
[1] Spanish Natl Res Council, Inst Pirena Ecol, Zaragoza, Spain
[2] Univ Ghent, Hydroclimate Extremes Lab H CEL, Ghent, Belgium
[3] Atmospher Sci & Global Change Div, Pacific Northwest Natl Lab, POB 999, Richland, WA 99352 USA
[4] Washington State Univ, Sch Biol Sci, POB 644236, Pullman, WA 99164 USA
[5] Univ Tasmania, Sch Biol Sci, Hobart, Tas, Australia
[6] Aragonese Agcy Res & Dev Researcher ARAID, Zaragoza, Spain
[7] Univ Zaragoza, Dept Geog, Zaragoza, Spain
基金
欧洲研究理事会;
关键词
Transpiration; CO2; Atmospheric water demand; Earth system models; Climate change; Projections; WATER-USE EFFICIENCY; DECIDUOUS FOREST TREES; VAPOR-PRESSURE DEFICIT; TROPICAL RAIN-FOREST; EARTH SYSTEM MODELS; DYNAMIC VEGETATION MODELS; COMMUNITY LAND MODEL; MOJAVE DESERT SHRUBS; STOMATAL CONDUCTANCE; ELEVATED CO2;
D O I
10.1016/j.earscirev.2022.104055
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
As CO2 concentration in the atmosphere rises, there is a need for improved physical understanding of its impact on global plant transpiration. This knowledge gap poses a major hurdle in robustly projecting changes in the global hydrologic cycle. For this reason, here we review the different processes by which atmospheric CO2 concentration affects plant transpiration, the several uncertainties related to the complex physiological and radiative processes involved, and the knowledge gaps which need to be filled in order to improve predictions of plant transpiration. Although there is a high degree of certainty that rising CO2 will impact plant transpiration, the exact nature of this impact remains unclear due to complex interactions between CO2 and climate, and key aspects of plant morphology and physiology. The interplay between these factors has substantial consequences not only for future climate and global vegetation, but also for water availability needed for sustaining the productivity of terrestrial ecosystems. Future changes in global plant transpiration in response to enhanced CO2 are expected to be driven by water availability, atmospheric evaporative demand, plant physiological processes, emergent plant disturbances related to increasing temperatures, and the modification of plant physiology and coverage. Considering the universal sensitivity of natural and agricultural systems to terrestrial water availability we argue that reliable future projections of transpiration is an issue of the highest priority, which can only be achieved by integrating monitoring and modeling efforts to improve the representation of CO2 effects on plant transpiration in the next generation of earth system models.
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页数:16
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