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采用红外线CO2分析仪对大石早生李幼树光合特性研究结果表明：大石早生李光饱和点为1820－2120μmol·m-2·s-1，光补偿点为75μmol·m-2·s-1。净光合速率的日变化呈“中午降低型”的双峰曲线，最大值出现；在上午9：30，次峰值出现在下午5：00；净光合速率的年周期变化为双峰曲线，最高峰出现在6月10日，净光合速率为19．2μmolCO2·m-2·s-1，次高峰出现在8月22日。不同品种的净光合速率维持在13．3～17．7μmolCO2·m－2·s－1之间，大石早生李与其它相比，品种净光合速率无明显差异。
The results of infrared photosynthesis analysis on the early seedlings of Dashiesi by infrared CO2 analyzer showed that the light saturation point of early limestone was 1820-2120μmol · m-2 · s-1 and the light compensation point was 75μmol · m-2 · s-1. The diurnal variation of net photosynthetic rate showed a “noon-reduced” bimodal curve with the maximum value appearing. At 9:30 am, the secondary peak appeared at 5:00 pm; the annual net photosynthetic rate changed to a bimodal curve with the highest peak Appeared on June 10, the net photosynthetic rate was 19.2μmolCO2 · m-2 · s-1, sub-peak appeared on August 22nd. The net photosynthetic rate of different cultivars was maintained at 13.3 ~ 17.7μmolCO2 · m-2 · s-1. There was no significant difference in the net photosynthetic rate between the two species.