Effects of rising temperatures and [CO₂] on the physiology of tropical forest trees (2024)

Lloyd, J., & Farquhar, G. D. (2008). Effects of rising temperatures and [CO2] on the physiology of tropical forest trees. Philosophical Transactions of the Royal Society B: Biological Sciences, 363(1498), 1811-1817. https://doi.org/10.1098/rstb.2007.0032

Lloyd, Jon ; Farquhar, Graham D. / Effects of rising temperatures and [CO2] on the physiology of tropical forest trees. In: Philosophical Transactions of the Royal Society B: Biological Sciences. 2008 ; Vol. 363, No. 1498. pp. 1811-1817.

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title = "Effects of rising temperatures and [CO2] on the physiology of tropical forest trees",

abstract = "Using a mixture of observations and climate model outputs and a simple parametrization of leaf-level photosynthesis incorporating known temperature sensitivities, we find no evidence for tropical forests currently existing 'dangerously close' to their optimum temperature range. Our model suggests that although reductions in photosynthetic rate at leaf temperatures (TL) above 30°C may occur, these are almost entirely accountable for in terms of reductions in stomatal conductance in response to higher leaf-to-air vapour pressure deficits D. This is as opposed to direct effects of TL on photosynthetic metabolism. We also find that increases in photosynthetic rates associated with increases in ambient [CO2] over forthcoming decades should more than offset any decline in photosynthetic productivity due to higher D or TL or increased autotrophic respiration rates as a consequence of higher tissue temperatures. We also find little direct evidence that tropical forests should not be able to respond to increases in [CO2] and argue that the magnitude and pattern of increases in forest dynamics across Amazonia observed over the last few decades are consistent with a [CO 2]-induced stimulation of tree growth.",

keywords = "Climate change, Photosynthesis, Plant growth, Review",

author = "Jon Lloyd and Farquhar, {Graham D.}",

year = "2008",

month = may,

day = "27",

doi = "10.1098/rstb.2007.0032",

language = "English",

volume = "363",

pages = "1811--1817",

journal = "Philosophical Transactions of the Royal Society B: Biological Sciences",

issn = "0962-8436",

publisher = "The Royal Society",

number = "1498",

}

Lloyd, J & Farquhar, GD 2008, 'Effects of rising temperatures and [CO2] on the physiology of tropical forest trees', Philosophical Transactions of the Royal Society B: Biological Sciences, vol. 363, no. 1498, pp. 1811-1817. https://doi.org/10.1098/rstb.2007.0032

Effects of rising temperatures and [CO2] on the physiology of tropical forest trees. / Lloyd, Jon; Farquhar, Graham D.
In: Philosophical Transactions of the Royal Society B: Biological Sciences, Vol. 363, No. 1498, 27.05.2008, p. 1811-1817.

Research output: Contribution to journal › Article › peer-review

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AU - Farquhar, Graham D.

PY - 2008/5/27

Y1 - 2008/5/27

N2 - Using a mixture of observations and climate model outputs and a simple parametrization of leaf-level photosynthesis incorporating known temperature sensitivities, we find no evidence for tropical forests currently existing 'dangerously close' to their optimum temperature range. Our model suggests that although reductions in photosynthetic rate at leaf temperatures (TL) above 30°C may occur, these are almost entirely accountable for in terms of reductions in stomatal conductance in response to higher leaf-to-air vapour pressure deficits D. This is as opposed to direct effects of TL on photosynthetic metabolism. We also find that increases in photosynthetic rates associated with increases in ambient [CO2] over forthcoming decades should more than offset any decline in photosynthetic productivity due to higher D or TL or increased autotrophic respiration rates as a consequence of higher tissue temperatures. We also find little direct evidence that tropical forests should not be able to respond to increases in [CO2] and argue that the magnitude and pattern of increases in forest dynamics across Amazonia observed over the last few decades are consistent with a [CO 2]-induced stimulation of tree growth.

AB - Using a mixture of observations and climate model outputs and a simple parametrization of leaf-level photosynthesis incorporating known temperature sensitivities, we find no evidence for tropical forests currently existing 'dangerously close' to their optimum temperature range. Our model suggests that although reductions in photosynthetic rate at leaf temperatures (TL) above 30°C may occur, these are almost entirely accountable for in terms of reductions in stomatal conductance in response to higher leaf-to-air vapour pressure deficits D. This is as opposed to direct effects of TL on photosynthetic metabolism. We also find that increases in photosynthetic rates associated with increases in ambient [CO2] over forthcoming decades should more than offset any decline in photosynthetic productivity due to higher D or TL or increased autotrophic respiration rates as a consequence of higher tissue temperatures. We also find little direct evidence that tropical forests should not be able to respond to increases in [CO2] and argue that the magnitude and pattern of increases in forest dynamics across Amazonia observed over the last few decades are consistent with a [CO 2]-induced stimulation of tree growth.

KW - Climate change

KW - Photosynthesis

KW - Plant growth

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JO - Philosophical Transactions of the Royal Society B: Biological Sciences

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Lloyd J, Farquhar GD. Effects of rising temperatures and [CO2] on the physiology of tropical forest trees. Philosophical Transactions of the Royal Society B: Biological Sciences. 2008 May 27;363(1498):1811-1817. doi: 10.1098/rstb.2007.0032