摘要
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.
By using free air CO2 enrichment （FACE） system, a pot experiment under field condition was conducted to study the effects of elevated CO2 concentration （550±60 μmol·mol-1） on the leaf photosynthesis and chlorophyll fluorescence parameters of mung bean. Comparing with the control （CO2 concentration averagely 389±40 μmol·mol-1）, elevated CO2 concentration increased the leaf intercellular CO2 concentration （Ci） and net photosynthesis rate （Pn） at flowering and pod growth stage by 9.8% and 11.7%, decreased the stomatic conductance （Gs） and transpiration rate （Tr） by 32.0% and 24.6%, respectively, and increased the water use efficiency （WUE） by 83.5%. Elevated CO2 concentration had lesser effects on the minimal fluorescence （Fo）, maximal fluorescence （Fm）, variable fluorescence （Fv）, ratio of variable fluorescence to minimal fluorescence （Fv/Fo）, and ratio of variable fluorescence to maximal fluorescence （Fv/Fm） at bud stage, but increased the Fo at pod filling stage by 19.1% and decreased the Fm, Fv, Fv/Fo, and Fv/Fm by 9.0%, 14.3%, 25.8%, and 6.2%, respectively. These results suggested that elevated CO2 concentration could damage the structure of leaf photosystemⅡ and consequently decrease the leaf photosynthetic capacity in the late growth phase of mung bean.
出处
《应用生态学报》
CAS
CSCD
北大核心
2011年第10期2776-2780,共5页
Chinese Journal of Applied Ecology
基金
国家CDM基金项目"不同稳定浓度情景气候变化对农业和生态系统影响"
中英合作项目(H5105001)资助
关键词
绿豆
CO2浓度升高
FACE
气候变化
光合作用
叶绿素荧光参数
mung bean
elevated CO2 concentration
FACE
climate change
photosynthesis
chlorophyll fluorescence parameter
