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利用FACE系统在大田条件下通过盆栽试验研究了大气CO2浓度升高[CO2浓度平均为(550±60)μmol·mol-1]对绿豆叶片光合生理和叶绿素荧光参数的影响.结果表明:与对照[CO2浓度平均为(389±40)μmol·mol-1左右]相比,大气CO2浓度升高使花荚期绿豆叶片净光合速率(Pn)和胞间CO2浓度(Ci)分别升高11.7%和9.8%,气孔导度(Gs)和蒸腾速率(Tr)分别下降32.0%和24.6%,水分利用效率(WUE)提高83.5%;在蕾期,CO2浓度升高对绿豆叶片叶绿素初始荧光(Fo)、最大荧光(Fm)、可变荧光(Fv)、Fv/Fm和Fv/Fo没有显著影响;在鼓粒期,CO2浓度升高使绿豆叶片Fo增加19.1%,Fm和Fv分别下降9.0%和14.3%,Fv/Fo和Fv/Fm分别下降25.8%和6.2%.表明大气CO2浓度升高可能使绿豆生长后期光系统Ⅱ反应中心结构受到破坏,叶片的光合能力下降.
The effect of atmospheric CO2 concentration on the photosynthetic physiology and chlorophyll fluorescence parameters of mung bean leaves was studied by using FACE system under field conditions [average CO2 concentration (550 ± 60) μmol · mol-1]. The results showed that compared with the control (Pn) and intercellular CO2 concentration (Ci) in mung bean during flowering stage were increased by 11.7% compared with the control (CO2 concentration average of (389 ± 40) μmol · mol-1] (G) and transpiration rate (Tr) decreased by 32.0% and 24.6%, and water use efficiency (WUE) increased by 83.5% and. Fv, Fv / Fm and Fv / Fo had no significant effect. During the filling period, the increase of CO2 concentration increased the Fo of mung bean leaves by 19.1% and the Fm and Fv decreased by 9.0% And Fv / Fm decreased by 25.8% and 6.2% respectively, indicating that the increase of atmospheric CO2 concentration may cause the damage of the reaction center structure of photosystem Ⅱ and the decrease of photosynthetic capacity of leaves.