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研究结果表明,不同品种之间的光合速率有一定差异,但差异不显著;不同生育期光合速率不同,其规律是结球期>莲座期>幼苗期;不同叶位叶片的光合速率差异非常显著,其大小顺序为上位叶>中位叶>下位叶;大白菜光补偿点为22～25μmol·m~(-2)·s~(-1),光饱和点为850～950μmol·m~(-2)·s~(-1),CO_2补偿点为44.3～47.5ppm,CO_2饱和点为1300ppm,羧化效率CE=0.09156～0.09865μmol·m~(-2)·s~(-1)/ppm,在正常栽培条件下,光合速率日变化呈双峰曲线,在水分胁迫条件下则呈单峰曲线。
The results showed that the photosynthetic rate of different varieties had some differences, but the difference was not significant. The photosynthetic rate was different at different growth stages, and the law was at the stage of rosette stage> seedling stage. The differences of photosynthetic rate in different leaf positions were significant , The order of the order of the upper leaves> the middle leaves> the lower leaves; the light compensation point of Chinese cabbage is 22 ~ 25μmol · m -2 · s -1, the light saturation point is 850 ~ 950μmol · m ~ -2) · s ~ (-1), the compensation point of CO_2 is 44.3 ~ 47.5ppm, the saturation point of CO_2 is 1300ppm, the carboxylation efficiency CE = 0.09156 ~ 0.09865μmol · m -2 · s -1 / ppm. Under normal cultivation conditions, the diurnal variation of photosynthetic rate showed a bimodal curve and a single peak curve under the condition of water stress.