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Title: Experimental warming across a tropical forest canopy height gradient reveals minimal photosynthetic and respiratory acclimation

Journal Article · · Plant, Cell and Environment
DOI: https://doi.org/10.1111/pce.14134 · OSTI ID:1805298
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]
  1. 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
  2. United States Department of Agriculture, Forest Service International Institute of Tropical Forestry, Jardin Botánico Sur Río Piedras Puerto Rico USA
  3. U.S. Geological Survey, Southwest Biological Science Center Moab Utah USA
  4. College of Forest Resources and Environmental Science Michigan Technological University Houghton Michigan USA

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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
89243018SSC000014; SC0008168; SC0011806; SC0012000; SC0018942
OSTI ID:
1805298
Journal Information:
Plant, Cell and Environment, Journal Name: Plant, Cell and Environment Journal Issue: 9 Vol. 44; ISSN 0140-7791
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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