Experimental warming across a tropical forest canopy height gradient reveals minimal photosynthetic and respiratory acclimation
Abstract
Abstract Tropical forest canopies cycle vast amounts of carbon, yet we still have a limited understanding of how these critical ecosystems will respond to climate warming. We implemented in situ leaf‐level + 3°C experimental warming from the understory to the upper canopy of two Puerto Rican tropical tree species, Guarea guidonia and Ocotea sintenisii . After approximately 1 month of continuous warming, we assessed adjustments in photosynthesis, chlorophyll fluorescence, stomatal conductance, leaf traits and foliar respiration. Warming did not alter net photosynthetic temperature response for either species; however, the optimum temperature of Ocotea understory leaf photosynthetic electron transport shifted upward. There was no Ocotea respiratory treatment effect, while Guarea respiratory temperature sensitivity ( Q 10 ) was down‐regulated in heated leaves. The optimum temperatures for photosynthesis ( T opt ) decreased 3–5°C from understory to the highest canopy position, perhaps due to upper canopy stomatal conductance limitations. Guarea upper canopy T opt was similar to the mean daytime temperatures, while Ocotea canopy leaves often operated above T opt . With minimal acclimation to warmer temperatures in the upper canopy, further warming could put these forests at risk of reduced CO 2 uptake, which could weaken the overall carbon sink strength of thismore »
- Authors:
-
[1];
[2];
[3];
[4];
[4]
- College of Forest Resources and Environmental Science Michigan Technological University Houghton Michigan USA, Earth and Environmental Science Division Los Alamos National Laboratory Los Alamos New Mexico USA
- United States Department of Agriculture, Forest Service International Institute of Tropical Forestry, Jardin Botánico Sur Río Piedras Puerto Rico USA
- U.S. Geological Survey, Southwest Biological Science Center Moab Utah USA
- College of Forest Resources and Environmental Science Michigan Technological University Houghton Michigan USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1805298
- Grant/Contract Number:
- 89243018S‐SC‐000014; DE‐SC‐0008168; DE‐SC‐0011806; DE‐SC‐0012000; DE‐SC‐0018942
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Plant, Cell and Environment
- Additional Journal Information:
- Journal Name: Plant, Cell and Environment Journal Volume: 44 Journal Issue: 9; Journal ID: ISSN 0140-7791
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Carter, Kelsey R., Wood, Tana E., Reed, Sasha C., Butts, Kaylie M., and Cavaleri, Molly A. Experimental warming across a tropical forest canopy height gradient reveals minimal photosynthetic and respiratory acclimation. United Kingdom: N. p., 2021.
Web. doi:10.1111/pce.14134.
Carter, Kelsey R., Wood, Tana E., Reed, Sasha C., Butts, Kaylie M., & Cavaleri, Molly A. Experimental warming across a tropical forest canopy height gradient reveals minimal photosynthetic and respiratory acclimation. United Kingdom. https://doi.org/10.1111/pce.14134
Carter, Kelsey R., Wood, Tana E., Reed, Sasha C., Butts, Kaylie M., and Cavaleri, Molly A. Tue .
"Experimental warming across a tropical forest canopy height gradient reveals minimal photosynthetic and respiratory acclimation". United Kingdom. https://doi.org/10.1111/pce.14134.
@article{osti_1805298,
title = {Experimental warming across a tropical forest canopy height gradient reveals minimal photosynthetic and respiratory acclimation},
author = {Carter, Kelsey R. and Wood, Tana E. and Reed, Sasha C. and Butts, Kaylie M. and Cavaleri, Molly A.},
abstractNote = {Abstract Tropical forest canopies cycle vast amounts of carbon, yet we still have a limited understanding of how these critical ecosystems will respond to climate warming. We implemented in situ leaf‐level + 3°C experimental warming from the understory to the upper canopy of two Puerto Rican tropical tree species, Guarea guidonia and Ocotea sintenisii . After approximately 1 month of continuous warming, we assessed adjustments in photosynthesis, chlorophyll fluorescence, stomatal conductance, leaf traits and foliar respiration. Warming did not alter net photosynthetic temperature response for either species; however, the optimum temperature of Ocotea understory leaf photosynthetic electron transport shifted upward. There was no Ocotea respiratory treatment effect, while Guarea respiratory temperature sensitivity ( Q 10 ) was down‐regulated in heated leaves. The optimum temperatures for photosynthesis ( T opt ) decreased 3–5°C from understory to the highest canopy position, perhaps due to upper canopy stomatal conductance limitations. Guarea upper canopy T opt was similar to the mean daytime temperatures, while Ocotea canopy leaves often operated above T opt . With minimal acclimation to warmer temperatures in the upper canopy, further warming could put these forests at risk of reduced CO 2 uptake, which could weaken the overall carbon sink strength of this tropical forest.},
doi = {10.1111/pce.14134},
journal = {Plant, Cell and Environment},
number = 9,
volume = 44,
place = {United Kingdom},
year = {Tue Jul 06 00:00:00 EDT 2021},
month = {Tue Jul 06 00:00:00 EDT 2021}
}
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Height-related growth declines in ponderosa pine are not due to carbon limitation
journal, January 2009
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An In Situ Leaf and Branch Warming Experiment in the Amazon: Warming Experiment in the Amazon
journal, January 2011
- Doughty, Christopher E.
- Biotropica, Vol. 43, Issue 6
A worldwide analysis of within-canopy variations in leaf structural, chemical and physiological traits across plant functional types
journal, October 2014
- Niinemets, Ülo; Keenan, Trevor F.; Hallik, Lea
- New Phytologist, Vol. 205, Issue 3
Short-term acclimation to warmer temperatures accelerates leaf carbon exchange processes across plant types
journal, May 2017
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- Global Change Biology, Vol. 23, Issue 11
Canopy position affects the temperature response of leaf respiration in Populus deltoides
journal, June 2002
- Griffin, Kevin L.; Turnbull, Matthew; Murthy, Ramesh
- New Phytologist, Vol. 154, Issue 3