Contrasting acclimation responses to elevated CO₂ and warming between an evergreen and a deciduous boreal conifer (2024)

Dusenge, M. E., Madhavji, S., & Way, D. A. (2020). Contrasting acclimation responses to elevated CO2 and warming between an evergreen and a deciduous boreal conifer. Global Change Biology, 26(6), 3639-3657. https://doi.org/10.1111/gcb.15084

Dusenge, Mirindi E. ; Madhavji, Sasha ; Way, Danielle A. / Contrasting acclimation responses to elevated CO2 and warming between an evergreen and a deciduous boreal conifer. In: Global Change Biology. 2020 ; Vol. 26, No. 6. pp. 3639-3657.

@article{dc2d418d199d4b0f9c197e39df8412c4,

title = "Contrasting acclimation responses to elevated CO2 and warming between an evergreen and a deciduous boreal conifer",

abstract = "Rising atmospheric carbon dioxide (CO2) concentrations may warm northern latitudes up to 8°C by the end of the century. Boreal forests play a large role in the global carbon cycle, and the responses of northern trees to climate change will thus impact the trajectory of future CO2 increases. We grew two North American boreal tree species at a range of future climate conditions to assess how growth and carbon fluxes were altered by high CO2 and warming. Black spruce (Picea mariana, an evergreen conifer) and tamarack (Larix laricina, a deciduous conifer) were grown under ambient (407ppm) or elevated CO2 (750ppm) and either ambient temperatures, a 4°C warming, or an 8°C warming. In both species, the thermal optimum of net photosynthesis (ToptA) increased and maximum photosynthetic rates declined in warm-grown seedlings, but the strength of these changes varied between species. Photosynthetic capacity (maximum rates of Rubisco carboxylation, Vcmax, and of electron transport, Jmax) was reduced in warm-grown seedlings, correlating with reductions in leaf N and chlorophyll concentrations. Warming increased the activation energy for Vcmax and Jmax (EaV and EaJ, respectively) and the thermal optimum for Jmax. In both species, the ToptA was positively correlated with both EaV and EaJ, but negatively correlated with the ratio of Jmax/Vcmax. Respiration acclimated to elevated temperatures, but there were no treatment effects on the Q10 of respiration (the increase in respiration for a 10°C increase in leaf temperature). A warming of 4°C increased biomass in tamarack, while warming reduced biomass in spruce. We show that climate change is likely to negatively affect photosynthesis and growth in black spruce more than in tamarack, and that parameters used to model photosynthesis in dynamic global vegetation models (EaV and EaJ) show no response to elevated CO2.",

keywords = "Larix laricina, Picea mariana, V and J, acclimation, boreal conifers, climate change, evergreen and deciduous",

author = "Dusenge, {Mirindi E.} and Sasha Madhavji and Way, {Danielle A.}",

note = "Publisher Copyright: {\textcopyright} 2020 The Authors. Global Change Biology published by John Wiley & Sons Ltd",

year = "2020",

month = jun,

day = "1",

doi = "10.1111/gcb.15084",

language = "English",

volume = "26",

pages = "3639--3657",

journal = "Global Change Biology",

issn = "1354-1013",

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Dusenge, ME, Madhavji, S & Way, DA 2020, 'Contrasting acclimation responses to elevated CO2 and warming between an evergreen and a deciduous boreal conifer', Global Change Biology, vol. 26, no. 6, pp. 3639-3657. https://doi.org/10.1111/gcb.15084

Contrasting acclimation responses to elevated CO2 and warming between an evergreen and a deciduous boreal conifer. / Dusenge, Mirindi E.; Madhavji, Sasha; Way, Danielle A.
In: Global Change Biology, Vol. 26, No. 6, 01.06.2020, p. 3639-3657.

Research output: Contribution to journal › Article › peer-review

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T1 - Contrasting acclimation responses to elevated CO2 and warming between an evergreen and a deciduous boreal conifer

AU - Dusenge, Mirindi E.

AU - Madhavji, Sasha

AU - Way, Danielle A.

N1 - Publisher Copyright:© 2020 The Authors. Global Change Biology published by John Wiley & Sons Ltd

PY - 2020/6/1

Y1 - 2020/6/1

N2 - Rising atmospheric carbon dioxide (CO2) concentrations may warm northern latitudes up to 8°C by the end of the century. Boreal forests play a large role in the global carbon cycle, and the responses of northern trees to climate change will thus impact the trajectory of future CO2 increases. We grew two North American boreal tree species at a range of future climate conditions to assess how growth and carbon fluxes were altered by high CO2 and warming. Black spruce (Picea mariana, an evergreen conifer) and tamarack (Larix laricina, a deciduous conifer) were grown under ambient (407ppm) or elevated CO2 (750ppm) and either ambient temperatures, a 4°C warming, or an 8°C warming. In both species, the thermal optimum of net photosynthesis (ToptA) increased and maximum photosynthetic rates declined in warm-grown seedlings, but the strength of these changes varied between species. Photosynthetic capacity (maximum rates of Rubisco carboxylation, Vcmax, and of electron transport, Jmax) was reduced in warm-grown seedlings, correlating with reductions in leaf N and chlorophyll concentrations. Warming increased the activation energy for Vcmax and Jmax (EaV and EaJ, respectively) and the thermal optimum for Jmax. In both species, the ToptA was positively correlated with both EaV and EaJ, but negatively correlated with the ratio of Jmax/Vcmax. Respiration acclimated to elevated temperatures, but there were no treatment effects on the Q10 of respiration (the increase in respiration for a 10°C increase in leaf temperature). A warming of 4°C increased biomass in tamarack, while warming reduced biomass in spruce. We show that climate change is likely to negatively affect photosynthesis and growth in black spruce more than in tamarack, and that parameters used to model photosynthesis in dynamic global vegetation models (EaV and EaJ) show no response to elevated CO2.

AB - Rising atmospheric carbon dioxide (CO2) concentrations may warm northern latitudes up to 8°C by the end of the century. Boreal forests play a large role in the global carbon cycle, and the responses of northern trees to climate change will thus impact the trajectory of future CO2 increases. We grew two North American boreal tree species at a range of future climate conditions to assess how growth and carbon fluxes were altered by high CO2 and warming. Black spruce (Picea mariana, an evergreen conifer) and tamarack (Larix laricina, a deciduous conifer) were grown under ambient (407ppm) or elevated CO2 (750ppm) and either ambient temperatures, a 4°C warming, or an 8°C warming. In both species, the thermal optimum of net photosynthesis (ToptA) increased and maximum photosynthetic rates declined in warm-grown seedlings, but the strength of these changes varied between species. Photosynthetic capacity (maximum rates of Rubisco carboxylation, Vcmax, and of electron transport, Jmax) was reduced in warm-grown seedlings, correlating with reductions in leaf N and chlorophyll concentrations. Warming increased the activation energy for Vcmax and Jmax (EaV and EaJ, respectively) and the thermal optimum for Jmax. In both species, the ToptA was positively correlated with both EaV and EaJ, but negatively correlated with the ratio of Jmax/Vcmax. Respiration acclimated to elevated temperatures, but there were no treatment effects on the Q10 of respiration (the increase in respiration for a 10°C increase in leaf temperature). A warming of 4°C increased biomass in tamarack, while warming reduced biomass in spruce. We show that climate change is likely to negatively affect photosynthesis and growth in black spruce more than in tamarack, and that parameters used to model photosynthesis in dynamic global vegetation models (EaV and EaJ) show no response to elevated CO2.

KW - Larix laricina

KW - Picea mariana

KW - V and J

KW - acclimation

KW - boreal conifers

KW - climate change

KW - evergreen and deciduous

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U2 - 10.1111/gcb.15084

DO - 10.1111/gcb.15084

M3 - Article

SN - 1354-1013

VL - 26

SP - 3639

EP - 3657

JO - Global Change Biology

JF - Global Change Biology

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Dusenge ME, Madhavji S, Way DA. Contrasting acclimation responses to elevated CO2 and warming between an evergreen and a deciduous boreal conifer. Global Change Biology. 2020 Jun 1;26(6):3639-3657. doi: 10.1111/gcb.15084