Sensitivity of plants to changing atmospheric CO2 concentration: From the geological past to the next century
Peter J. Franks,Mark A. Adams,Jeffrey S. Amthor,Margaret M. Barbour,Joseph A. Berry,David S. Ellsworth,Graham D. Farquhar,Oula Ghannoum,Jon Lloyd,Jon Lloyd,Nate G. McDowell,Richard J. Norby,David T. Tissue,Susanne von Caemmerer +13 more
TLDR
Overall, the sensitivity of plants to rising or falling c(a) is qualitatively similar across all scales considered, and is characterised by an adaptive feedback response that tends to maintain 1 - c(i)/c(a), the relative gradient for CO(2) diffusion into the leaf, relatively constant.Abstract:
'Summary' 1077
I. 'Introduction' 1078
II. 'Atmospheric CO2 concentrations through time' 1079
III. 'Plant sensitivity to CO2 at geological timescales' 1080
IV. 'Plant sensitivity to CO2 over the last 200 yr' 1081
V. 'Plant sensitivity to long-term experimental manipulation of CO2' 1084
VI. 'Simple formulation of stomatal conductance in land surface models for simulating long-term CO2 response' 1087
VII. 'Conclusions' 1088
'Acknowledgements' 1089
References 1089
Summary
The rate of CO2 assimilation by plants is directly influenced by the concentration of CO2 in the atmosphere, ca. As an environmental variable, ca also has a unique global and historic significance. Although relatively stable and uniform in the short term, global ca has varied substantially on the timescale of thousands to millions of years, and currently is increasing at seemingly an unprecedented rate. This may exert profound impacts on both climate and plant function. Here we utilise extensive datasets and models to develop an integrated, multi-scale assessment of the impact of changing ca on plant carbon dioxide uptake and water use. We find that, overall, the sensitivity of plants to rising or falling ca is qualitatively similar across all scales considered. It is characterised by an adaptive feedback response that tends to maintain 1 − ci/ca, the relative gradient for CO2 diffusion into the leaf, relatively constant. This is achieved through predictable adjustments to stomatal anatomy and chloroplast biochemistry. Importantly, the long-term response to changing ca can be described by simple equations rooted in the formulation of more commonly studied short-term responses.read more
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References
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Climate change 2007: the physical science basis
Susan Solomon,Dahe Qin,Martin R. Manning,Melinda Marquis,Kristen Averyt,Melinda M.B. Tignor,H. L. Miller,Z. Chen +7 more
TL;DR: The first volume of the IPCC's Fourth Assessment Report as mentioned in this paper was published in 2007 and covers several topics including the extensive range of observations now available for the atmosphere and surface, changes in sea level, assesses the paleoclimatic perspective, climate change causes both natural and anthropogenic, and climate models for projections of global climate.
Journal ArticleDOI
Climate change 2001: the scientific basis
John Theodore Houghton,Y. Ding,David John Griggs,M. Noguer,P. J. van der Linden,X. Dai,K. Maskell,C. A. Johnson +7 more
TL;DR: In this article, the authors present an overview of the climate system and its dynamics, including observed climate variability and change, the carbon cycle, atmospheric chemistry and greenhouse gases, and their direct and indirect effects.
Journal ArticleDOI
A Biochemical Model of Photosynthetic CO 2 Assimilation in Leaves of C 3 Species
TL;DR: Various aspects of the biochemistry of photosynthetic carbon assimilation in C3 plants are integrated into a form compatible with studies of gas exchange in leaves.
Journal ArticleDOI
Carbon Isotope Discrimination and Photosynthesis
TL;DR: In this article, the physical and enzymatic bases of carbone isotope discrimination during photosynthesis were discussed, noting how knowledge of discrimination can be used to provide additional insight into photosynthetic metabolism and the environmental influences on that process.
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The representative concentration pathways: an overview
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