Advanced

Physiological acclimation dampens initial effects of elevated temperature and atmospheric CO2 concentration in mature boreal Norway spruce

Lamba, Shubhangi; Hall, Marianne LU ; Räntfors, Mats; Chaudhary, Nitin LU ; Linder, Sune; Way, Danielle; Uddling, Johan and Wallin, Göran (2017) In Plant Cell and Environment
Abstract

Physiological processes of terrestrial plants regulate the land-atmosphere exchange of carbon, water, and energy, yet few studies have explored the acclimation responses of mature boreal conifer trees to climate change. Here we explored the acclimation responses of photosynthesis, respiration, and stomatal conductance to elevated temperature and/or CO2 concentration ([CO2]) in a 3-year field experiment with mature boreal Norway spruce. We found that elevated [CO2] decreased photosynthetic carboxylation capacity (-23% at 25 °C) and increased shoot respiration (+64% at 15 °C), while warming had no significant effects. Shoot respiration, but not photosynthetic capacity, exhibited seasonal acclimation.... (More)

Physiological processes of terrestrial plants regulate the land-atmosphere exchange of carbon, water, and energy, yet few studies have explored the acclimation responses of mature boreal conifer trees to climate change. Here we explored the acclimation responses of photosynthesis, respiration, and stomatal conductance to elevated temperature and/or CO2 concentration ([CO2]) in a 3-year field experiment with mature boreal Norway spruce. We found that elevated [CO2] decreased photosynthetic carboxylation capacity (-23% at 25 °C) and increased shoot respiration (+64% at 15 °C), while warming had no significant effects. Shoot respiration, but not photosynthetic capacity, exhibited seasonal acclimation. Stomatal conductance at light saturation and a vapour pressure deficit of 1 kPa was unaffected by elevated [CO2] but significantly decreased (-27%) by warming, and the ratio of intercellular to ambient [CO2] was enhanced (+17%) by elevated [CO2] and decreased (-12%) by warming. Many of these responses differ from those typically observed in temperate tree species. Our results show that long-term physiological acclimation dampens the initial stimulation of plant net carbon assimilation to elevated [CO2], and of plant water use to warming. Models that do not account for these responses may thus overestimate the impacts of climate change on future boreal vegetation-atmosphere interactions.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Carboxylation efficiency, Intercellular CO concentration, Picea abies, Transpiration, V, Whole-tree chambers
in
Plant Cell and Environment
publisher
Wiley-Blackwell
external identifiers
  • scopus:85038366672
ISSN
0140-7791
DOI
10.1111/pce.13079
language
English
LU publication?
yes
id
37c1f3ef-efa9-4f61-8d04-a5408fba0ac4
date added to LUP
2018-01-05 06:58:16
date last changed
2018-01-06 03:00:09
@article{37c1f3ef-efa9-4f61-8d04-a5408fba0ac4,
  abstract     = {<p>Physiological processes of terrestrial plants regulate the land-atmosphere exchange of carbon, water, and energy, yet few studies have explored the acclimation responses of mature boreal conifer trees to climate change. Here we explored the acclimation responses of photosynthesis, respiration, and stomatal conductance to elevated temperature and/or CO<sub>2</sub> concentration ([CO<sub>2</sub>]) in a 3-year field experiment with mature boreal Norway spruce. We found that elevated [CO<sub>2</sub>] decreased photosynthetic carboxylation capacity (-23% at 25 °C) and increased shoot respiration (+64% at 15 °C), while warming had no significant effects. Shoot respiration, but not photosynthetic capacity, exhibited seasonal acclimation. Stomatal conductance at light saturation and a vapour pressure deficit of 1 kPa was unaffected by elevated [CO<sub>2</sub>] but significantly decreased (-27%) by warming, and the ratio of intercellular to ambient [CO<sub>2</sub>] was enhanced (+17%) by elevated [CO<sub>2</sub>] and decreased (-12%) by warming. Many of these responses differ from those typically observed in temperate tree species. Our results show that long-term physiological acclimation dampens the initial stimulation of plant net carbon assimilation to elevated [CO<sub>2</sub>], and of plant water use to warming. Models that do not account for these responses may thus overestimate the impacts of climate change on future boreal vegetation-atmosphere interactions.</p>},
  author       = {Lamba, Shubhangi and Hall, Marianne and Räntfors, Mats and Chaudhary, Nitin and Linder, Sune and Way, Danielle and Uddling, Johan and Wallin, Göran},
  issn         = {0140-7791},
  keyword      = {Carboxylation efficiency,Intercellular CO concentration,Picea abies,Transpiration,V,Whole-tree chambers},
  language     = {eng},
  month        = {12},
  publisher    = {Wiley-Blackwell},
  series       = {Plant Cell and Environment},
  title        = {Physiological acclimation dampens initial effects of elevated temperature and atmospheric CO<sub>2</sub> concentration in mature boreal Norway spruce},
  url          = {http://dx.doi.org/10.1111/pce.13079},
  year         = {2017},
}