Will Photosynthetic Capacity of Aspen Trees Acclimate After Long-Term Exposure to Elevated CO2 and O3?

Authors

Joseph N. T. Darbah
Mark E. Kubiske
Neil Nelson
Katre Kets
Johanna Rilkonen
Anu Sober
Lisa Rouse
David F. Karnosky

Document Type

Article

Journal/Book Title/Conference

Environmental Pollution

Volume

158

Issue

4

First Page

983

Last Page

991

Publication Date

4-2010

Abstract

Photosynthetic acclimation under elevated carbon dioxide (CO₂) and/or ozone (O₃) has been the topic of discussion in many papers recently. We examined whether or not aspen plants grown under elevated CO₂and/or O₃ will acclimate after 11 years of exposure at the Aspen Face site in Rhinelander, WI, USA. We studied diurnal patterns of instantaneous photosynthetic measurements as well as A/C_i measurements monthly during the 2004–2008 growing seasons. Our results suggest that the responses of two aspen clones differing in O₃ sensitivity showed no evidence of photosynthetic and stomatal acclimation under either elevated CO₂, O₃ or CO₂ + O₃. Both clones 42E and 271 did not show photosynthetic nor stomatal acclimation under elevated CO₂ and O₃ after a decade of exposure. We found that the degree of increase or decrease in the photosynthesis and stomatal conductance varied significantly from day to day and from one season to another.

Recommended Citation

Darbah, Joseph N.T. et al. 2010. Will photosynthetic capacity of aspen trees acclimate after long-term exposure to elevated CO2 and O3? Environmental Pollution. 158(4):983-991.