Photosynthetic Responses of Four Urban Tree Species Exposed to Elevated CO₂ and/or Elevated O₃

Abstract:

We compared the differences in photosynthesis of four urban tree species (Ginkgo biloba, Pinus tabulaeformis, Quercus mongolica and Pinus armandii) exposed to long-term elevated CO₂ (700 ppm) and/or O₃ (80 ppb) fumigation in (open top chamber) OTC. Our results suggest that elevated CO₂ alleviated the damaging influence of elevated O₃ on photosynthesis in the four urban tree species. Both Q. mongolica and P. armandii showed photosynthetic acclimation after long-term treatment under elevated CO₂. The combined effect of elevated CO₂ and O₃ caused the changes including net photosynthetic rates (Pn), stomatal conductance (gs) and chlorophyll content that were more similar to ambient air (CK) or slightly lower than elevated CO₂, indicating that elevated CO₂ is able to totally or partly alleviate the harmful effects of elevated O₃ on urban tree species.

• Periodical: Advanced Materials Research (Volumes 641-642)
• Pages: 22-25
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.641-642.22
• Online since: January 2013
• Authors: Sheng Xu, Jiang Yan Gao, Wei Chen, Xing Yuan He, Yan Qing Huang
• Keywords: Global climate change, Photosynthesis, Urban Tree Species

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