Abstract:To study the responses of photosynthesis and growth in leaves of Quercus mongolica to elevated O3, elevated CO2 and elevated O3+CO2 in urban area, experiment was conducted in Shenyang Arboretum located at the center of the city. Four-year-old trees grown in open-top chambers (OTC) were exposed to control, elevated O3, elevated CO2 and elevated O3 + elevated CO2 for two growing seasons, and the growth (fresh weight, dry weight, leaf, area per leaf ), and diurnal assimilation amounts of Quercus mongolica leaves were measured. Diurnal assimilation amounts were decreased in elevated O3 treatment, the fresh weight, dry weight and area per leaf were also reduced by elevated O3 compared to the control. Under elevated CO2 exposure, the fresh weight, dry weight and area per leaf were increased, significantly in 2007, While, Diurnal assimilation amounts were increased after elevated CO2 exposure in total. When trees were exposed to both elevated O3 and elevated CO2, the fresh weight, dry weight, area per leaf and Diurnal assimilation amounts were all lower than control but higher than only elevated O3 treatment, which indicated that high CO2 can largely relieve the damage of high O3 to photosynthesis of Quercus mongolica leaves, so as to relieve the O3-induced negative effect of leaves growth.
王兰兰, 何兴元, 陈玮, 李雪梅. 大气中O3、CO2浓度升高对蒙古栎叶片生长的影响[J]. 中国环境科学, 2011, 31(2): 340-345.
WANG Lan-Lan, HE Xing-Yuan, CHEN Wei, LI Xue-Mei. Effects of elevated O3 or/and CO2 on growth in leaves of Quercus mongolica. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(2): 340-345.