为研究大气CO_2浓度升高对大豆光合能力影响,了解未来全球气候变化后大豆光合生理变化,为气候变化下的大豆生产提供理论依据。本文利用开放式大气CO_2富集系统(free air CO_2 enrichment,FACE)试验平台,研究了大气CO_2浓度升高对大豆叶片光合生理和叶绿素荧光参数的影响。结果表明:大气CO_2浓度升高后,大豆净光合速率(Pn)增加,气孔导度(Gs)和蒸腾速率(Tr)下降,水分利用效率(WUE)提高。大气CO_2浓度升高使CO_2同化速率相对应的荧光量子产量(PhiCO_2)平均降低了29.8%,光化学淬灭系数(qP)平均降低了4.6%。但大豆叶片PSⅡ最大光化学量子产量(F_v /F_m)、PSⅡ实际光化学量子产量(PhiPSⅡ)和非光化学猝灭系数(NPQ)没有显著变化。
英文摘要:
This study on the effect of elevated CO_2 concentration on soybean photosynthetic ability will be helpful to understand the changes of soybean photosynthetic physiological under the future of global climate change. By using free air CO_2 enrichment (FACE) system,a pot experiment under field condition was conducted to study the effects of elevated CO_2 concentration (550 60 mumol·mol~(- 1)) on the leaf photosynthesis and chlorophyll fluorescence parameters of soybean. Elevated CO_2 concentration increased the soybean leaf net photosynthesis rate (Pn) and the water use efficiency (WUE),decreased the stomatic conductance (Gs) and transpiration rate (Tr). Elevated CO_2 concentration decreased quantum yield of photosynthesis(PhiCO_2) and leaf propotion of open PSⅡ reaction centers (qP) by 29.8% and 4.6%,respectively. The maximum quantum efficiency of PSⅡ (F_v /F_m),quantum yield of PSⅡ (PhiPSⅡ) and leaf non-photochemical quenching (NPQ) were not changed under elevated CO_2 concentration.