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
(2018)
In Plant, Cell and Environment
41(2).
p.300-313
- 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)
- author
- Lamba, Shubhangi
; Hall, Marianne
LU
; Räntfors, Mats
; Chaudhary, Nitin
LU
; Linder, Sune
; Way, Danielle
; Uddling, Johan
and Wallin, Göran
- organization
- publishing date
- 2018-02
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Carboxylation efficiency, Intercellular CO concentration, Picea abies, Transpiration, V, Whole-tree chambers
- in
- Plant, Cell and Environment
- volume
- 41
- issue
- 2
- pages
- 300 - 313
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85038366672
- pmid:29226972
- 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
- 2024-04-14 22:45:23
@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}},
keywords = {{Carboxylation efficiency; Intercellular CO concentration; Picea abies; Transpiration; V; Whole-tree chambers}},
language = {{eng}},
number = {{2}},
pages = {{300--313}},
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}},
doi = {{10.1111/pce.13079}},
volume = {{41}},
year = {{2018}},
}