Photosynthetic responses of four urban tree species exposed to elevated CO2 and/or elevated O3
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 showed 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.
Global climate change Photosynthesis Urban tree species
Sheng Xu Jiang-Yan Gao Wei Chen Xing-Yuan He Yan-Qing Huang
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang China
国际会议
厦门
英文
22-25
2012-12-28（万方平台首次上网日期，不代表论文的发表时间）