CO_2浓度增高对三裂叶蟛蜞菊光合生理特性的影响  

Effects of CO_2 concentrations increasing on photosynthetic physiological characteristics of Wedelia trlobata

作　　者：刘金祥[1] 李志芳[1] 

机构地区：[1]湛江师范学院热带草业科学研究所,广东湛江524048

出　　处：《广西植物》2005年第5期477-480,446,共5页Guihaia

基　　金：广东省"千百十"优秀人才基金(Q02113);湛江市科技攻关项目(2002101)资助

摘　　要：在人工控制CO2浓度梯度条件下,测量了喜阴多年生草本植物三裂叶蟛蜞菊1月和3月的光合速率(Pn)、蒸腾速率(Tr)、胞间CO2浓度(Ci)、气孔导度(Gs)和叶面饱和蒸气压亏缺(Vpdl)。结果表明:CO2浓度升高对三裂叶蟛蜞菊的光合生理特性影响较大,当CO2浓度由0升高到1900μmol·mol1的过程中,Pn增加很快,其值在1.53～11.3μmol·m2·s1之间;水分利用率(WUE:光合与蒸腾之比)随CO2浓度的升高也在增大,当CO2浓度为1900μmol·mol1时,1月份的WUE是18.248μmol·mmol1,3月份的只有8.794μmol·mmol1,高水分利用效率与其对干旱的适应性密切相关。In order to study influence of CO2 enhance on photosynthetic physiological characters of Wedelia trlobata L. , photosynthesis rate（Pn）, transpiration rate（Tr）, intercellular CO2 concentrations（Ci）, stomatal conductance（Gs）and vapor deficit at the leaf surface （Vpdl）were measured on individuals of W. trlobata with the effective of CO2concentrations increased from 0 to 1 900 μmol · mol^-1. Results were summarized as followed： Pn,Ci and WUE all increased with the increasing of CO2 concentrations. The Gs,Tr in January at first increased with the increasing of CO2 concentrations, but later decreased as CO2 concentrations exceed 1 000 μmol · mol^-1. The Gs,Tr in March reduced with the increasing of CO2 concentrations. The value of WUE is also increased with the increasing of CO2 concentrations,but there is a difference between January and March at 1 900 μmol · mol^-1 There may be more correlation between WUE and dry ability of W. trlobata.

关 键 词：三裂叶蟛蜞菊 CO2浓度 光合生理 

分 类 号：Q945.1[生物学—植物学]