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

Artikel i vetenskaplig tidskrift
Författare Shubhangi Lamba
Marianne Hall
Mats Räntfors
Nitin Chaudhary
Sune Linder
Danielle Way
Johan Uddling
Göran Wallin
Publicerad i Plant, Cell and Environment
Volym 41
Nummer/häfte 2
Sidor 300–313
ISSN 0140-7791
Publiceringsår 2018
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 300–313
Språk en
Länkar dx.doi.org/10.1111/pce.13079/
onlinelibrary.wiley.com/doi/10.1111...
Ämnesord carboxylation efficiency; intercellular CO2 concentration; Picea abies; transpiration; Vcmax; whole-tree chambers
Ämneskategorier Annan biologi, Terrestrisk ekologi, Botanik

Sammanfattning

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.

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