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Boreal conifers maintain carbon uptake with warming despite failure to track optimal temperatures

Environmental Studies and Forestry

Boreal conifers maintain carbon uptake with warming despite failure to track optimal temperatures

M. E. Dusenge, J. M. Warren, et al.

This study reveals that warming is shifting the thermal optimum of net photosynthesis in mature boreal conifers, although not at the pace of rising temperatures. Conducted by a team of researchers including Mirindi Eric Dusenge and Jeffrey M. Warren, it highlights how these trees can thermally acclimate to maintain carbon uptake amidst climate change.

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Playback language: English
Abstract
Warming shifts the thermal optimum of net photosynthesis (*T*<sub>optA</sub>) to higher temperatures. This study, using a whole-ecosystem warming controlled experiment under ambient or elevated CO₂ levels, shows that *T*<sub>optA</sub> of mature boreal conifers increased with warming, but not at the pace of warming itself (*T*<sub>optA</sub> increased by only 0.26–0.35 °C per 1 °C of warming). Net photosynthetic rates at mean growth temperature increased with warming in elevated CO₂ spruce, but remained constant in other treatments. Despite insufficient *T*<sub>optA</sub> shifts to fully keep pace with warming, these boreal conifers thermally acclimate photosynthesis to maintain carbon uptake.
Publisher
Nature Communications
Published On
Aug 03, 2023
Authors
Mirindi Eric Dusenge, Jeffrey M. Warren, Peter B. Reich, Eric J. Ward, Bridget K. Murphy, Artur Stefanski, Raimundo Bermudez, Marisol Cruz, David A. McLennan, Anthony W. King, Rebecca A. Montgomery, Paul J. Hanson, Danielle A. Way
Tags
thermal optimum
net photosynthesis
boreal conifers
warming
CO2 levels
thermal acclimation

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