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Effects of rising temperatures and [CO(2)] on the physiology of tropical forest trees
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 th...
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Formato: | Texto |
Lenguaje: | English |
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The Royal Society
2008
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2374913/ https://www.ncbi.nlm.nih.gov/pubmed/18267901 http://dx.doi.org/10.1098/rstb.2007.0032 |
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author | Lloyd, Jon Farquhar, Graham D |
author_facet | Lloyd, Jon Farquhar, Graham D |
author_sort | Lloyd, Jon |
collection | PubMed |
description | 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 (T(L)) 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 T(L) on photosynthetic metabolism. We also find that increases in photosynthetic rates associated with increases in ambient [CO(2)] over forthcoming decades should more than offset any decline in photosynthetic productivity due to higher D or T(L) 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 [CO(2)] 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. |
format | Text |
id | pubmed-2374913 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2008 |
publisher | The Royal Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-23749132008-05-09 Effects of rising temperatures and [CO(2)] on the physiology of tropical forest trees Lloyd, Jon Farquhar, Graham D Philos Trans R Soc Lond B Biol Sci Review 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 (T(L)) 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 T(L) on photosynthetic metabolism. We also find that increases in photosynthetic rates associated with increases in ambient [CO(2)] over forthcoming decades should more than offset any decline in photosynthetic productivity due to higher D or T(L) 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 [CO(2)] 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. The Royal Society 2008-02-11 2008-05-27 /pmc/articles/PMC2374913/ /pubmed/18267901 http://dx.doi.org/10.1098/rstb.2007.0032 Text en Copyright © 2008 The Royal Society http://creativecommons.org/licenses/by/2.5/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Review Lloyd, Jon Farquhar, Graham D Effects of rising temperatures and [CO(2)] on the physiology of tropical forest trees |
title | Effects of rising temperatures and [CO(2)] on the physiology of tropical forest trees |
title_full | Effects of rising temperatures and [CO(2)] on the physiology of tropical forest trees |
title_fullStr | Effects of rising temperatures and [CO(2)] on the physiology of tropical forest trees |
title_full_unstemmed | Effects of rising temperatures and [CO(2)] on the physiology of tropical forest trees |
title_short | Effects of rising temperatures and [CO(2)] on the physiology of tropical forest trees |
title_sort | effects of rising temperatures and [co(2)] on the physiology of tropical forest trees |
topic | Review |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2374913/ https://www.ncbi.nlm.nih.gov/pubmed/18267901 http://dx.doi.org/10.1098/rstb.2007.0032 |
work_keys_str_mv | AT lloydjon effectsofrisingtemperaturesandco2onthephysiologyoftropicalforesttrees AT farquhargrahamd effectsofrisingtemperaturesandco2onthephysiologyoftropicalforesttrees |