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240513s2024 xx |||||o 00| ||eng c |
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|a 10.1111/nph.19806
|2 doi
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|a eng
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1 |
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|a Slot, Martijn
|e verfasserin
|4 aut
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| 245 |
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|a The stomatal response to vapor pressure deficit drives the apparent temperature response of photosynthesis in tropical forests
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 17.10.2024
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|a Date Revised 17.10.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2024 The Author(s). New Phytologist © 2024 New Phytologist Foundation. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.
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|a As temperature rises, net carbon uptake in tropical forests decreases, but the underlying mechanisms are not well understood. High temperatures can limit photosynthesis directly, for example by reducing biochemical capacity, or indirectly through rising vapor pressure deficit (VPD) causing stomatal closure. To explore the independent effects of temperature and VPD on photosynthesis we analyzed photosynthesis data from the upper canopies of two tropical forests in Panama with Generalized Additive Models. Stomatal conductance and photosynthesis consistently decreased with increasing VPD, and statistically accounting for VPD increased the optimum temperature of photosynthesis (Topt) of trees from a VPD-confounded apparent Topt of c. 30-31°C to a VPD-independent Topt of c. 33-36°C, while for lianas no VPD-independent Topt was reached within the measured temperature range. Trees and lianas exhibited similar temperature and VPD responses in both forests, despite 1500 mm difference in mean annual rainfall. Over ecologically relevant temperature ranges, photosynthesis in tropical forests is largely limited by indirect effects of warming, through changes in VPD, not by direct warming effects of photosynthetic biochemistry. Failing to account for VPD when determining Topt misattributes the underlying causal mechanism and thereby hinders the advancement of mechanistic understanding of global warming effects on tropical forest carbon dynamics
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|a Journal Article
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|a Topt
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| 650 |
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4 |
|a Panama
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| 650 |
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|a climate change
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| 650 |
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4 |
|a photosynthesis
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| 650 |
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4 |
|a stomatal conductance
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| 650 |
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4 |
|a temperature response
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| 650 |
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4 |
|a tropical forest
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| 650 |
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4 |
|a vapor pressure deficit
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| 700 |
1 |
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|a Rifai, Sami W
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Eze, Chinedu E
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Winter, Klaus
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 244(2024), 4 vom: 11. Nov., Seite 1238-1249
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnas
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| 773 |
1 |
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|g volume:244
|g year:2024
|g number:4
|g day:11
|g month:11
|g pages:1238-1249
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| 856 |
4 |
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|u http://dx.doi.org/10.1111/nph.19806
|3 Volltext
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