Analyzes photosynthetic characteristics under elevated CO2 in urban forest species, suggesting species-specific responses.
The main photosynthetic characteristics of the main urban forest species Pinus tabulaefomis and Ginkgo biloba in Shenyang City were analyzed in open-top chambers under elevated CO₂ concentration. Net photosynthetic rates and soluble sugar, starch and soluble protein content of the leaves of the two species under elevated CO₂ concentration (700 µmol·mol⁻¹) were close to or higher than that of respective controls (natural CO₂ concentration), whose contents were increased differently between species. The responses of chlorophyll content and ratio of Chl a/Chl b under elevated CO₂ concentration were not identical for the two species. As well, chlorophyll content increased and ratio of Chl a/Chl b decreased in P. tabulaefomis leaves under elevated CO₂ concentration, whereas chlorophyll content of G. biloba leaves increased during the earlier growing season, decreased in the later growing season, and the ratio of Chl a/Chl b responded contrarily, which indicated complexity in the response to elevated CO₂ concentration of tree species in an urban forest. Both tree species showed no photosynthetic acclimation to elevated CO₂ concentration.
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Wang et al. (2007) studied this question.
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