中文摘要：

利用开顶式气室（OTC）系统,设正常大气CO2浓度和CO2浓度升高200μmol·mol-12个CO2浓度处理,模拟大气CO2浓度升高对八宝景天光合生理和生长发育的影响.结果表明：大气CO2浓度升高使八宝景天叶片上、下表皮气孔密度分别显著下降16.1%和16.7%,使叶片维管束增粗,导管增多,靠近上表皮细胞增大;CO2浓度升高可以显著增加傍晚时八宝景天叶片光合色素含量,使夜间净光合速率、气孔导度和蒸腾速率显著增加.初花期傍晚,CO2浓度升高使叶片苹果酸含量显著下降64.0%,纤维素含量显著增加20.8%.盛花期清晨,CO2浓度升高使叶片苹果酸含量显著增加27.0%,对糖类物质含量影响不显著,植株的分枝数、单株茎质量和单株总生物量显著增加.CO2浓度升高可以促进八宝景天光合作用,有利于植株生长.

英文摘要：

We used an OTC （open top chamber） system to study the effects of elevated CO2 con- centration （atmospheric CO2 concentration ＋ 200 μmol · mol-1 ） on the growth and photosynthetic physiology of Hylotelephium erythrostictum. Elevated CO2 concentration decreased the leaf stomatal density of the upper and lower epidermis of H. erythrostictum by 16.1% and 16.7%, respectively. Elevated CO2 concentration increased the vascular bundle in leaves and the cell volume near the up- per epidermis. Elevated CO2 concentration significantly increased the photosynthetic pigments con- tent, net photosynthetic rate, stomatal conductance and transpiration rate of H. erythrostictum at night. In the evening of initial flowering stage, elevated CO2 concentration significantly reduced the malic acid content by 64.0%, while increased cellulose content by 20.8%. In the morning of full flowering stage, elevated CO2 concentration significantly increased the malic acid content by 27.0%, but had no effect on carbohydrate content. Elevated CO2 concentration increased the num- ber of branches per plant, stem mass and total biomass of H. erythrostictum. Elevated CO2 concen- tration was beneficial to the growth of H. erythrostictum.