Planta

, Volume 232, Issue 5, pp 1115–1125 | Cite as

Sustained enhancement of photosynthesis in mature deciduous forest trees after 8 years of free air CO2 enrichment

  • Martin Karl-Friedrich Bader
  • Rolf Siegwolf
  • Christian Körner
Original Article

Abstract

Carbon uptake by forests constitutes half of the planet’s terrestrial net primary production; therefore, photosynthetic responses of trees to rising atmospheric CO2 are critical to understanding the future global carbon cycle. At the Swiss Canopy Crane, we investigated gas exchange characteristics and leaf traits in five deciduous tree species during their eighth growing season under free air carbon dioxide enrichment in a 35-m tall, ca. 100-year-old mixed forest. Net photosynthesis of upper-canopy foliage was 48% (July) and 42% (September) higher in CO2-enriched trees and showed no sign of down-regulation. Elevated CO2 had no effect on carboxylation efficiency (V cmax) or maximal electron transport (J max) driving ribulose-1,5-bisphosphate (RuBP) regeneration. CO2 enrichment improved nitrogen use efficiency, but did not affect leaf nitrogen (N) concentration, leaf thickness or specific leaf area except for one species. Non-structural carbohydrates accumulated more strongly in leaves grown under elevated CO2 (largely driven by Quercus). Because leaf area index did not change, the CO2-driven stimulation of photosynthesis in these trees may persist in the upper canopy under future atmospheric CO2 concentrations without reductions in photosynthetic capacity. However, given the lack of growth stimulation, the fate of the additionally assimilated carbon remains uncertain.

Keywords

Elevated CO2 Global change Photosynthetic acclimation Swiss Canopy Crane 

Abbreviations

Agrowth

Light-saturated net photosynthesis measured at growth CO2 concentration (ambient CO2: A growth a ; elevated CO2: A growth e )

A550

Light-saturated net photosynthesis measured at 550 ppm leaf chamber CO2 concentration

A380

Light-saturated net photosynthesis measured at 380 ppm leaf chamber CO2 concentration

C

Carbon

E

A growth e /A growth a

E

A 550 /A 380

FACE

Free air carbon dioxide enrichment

Jmax

Maximal photosynthetic electron transport rate (a proxy for ribulose-1,5-bisphosphate regeneration)

LAI

Leaf area index

N

Nitrogen

PPFD

Photosynthetic photon flux density

SLA

Specific leaf area

NSC

Non-structural carbohydrates

SCC

Swiss canopy crane

SE

Standard error of the mean

Vcmax

Maximal carboxylation rate of Rubisco

ALVPD

Air-to-leaf vapour pressure deficit

Notes

Acknowledgments

We thank Erwin Amstutz for crane operations and for his efforts in data collection. We are grateful to the Paul Scherrer Institute (Switzerland) for the provision of equipment. Further, we thank Olivier Bignucolo for various laboratory analyses of leaf parameters. The SCC FACE study was supported by the Swiss National Science Foundation (grant 3100AO-111914/1).

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Martin Karl-Friedrich Bader
    • 1
  • Rolf Siegwolf
    • 2
  • Christian Körner
    • 1
  1. 1.Institute of BotanyUniversity of BaselBaselSwitzerland
  2. 2.Paul Scherrer InstituteVilligen PSISwitzerland

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