在中宁县小盐池滩玺赞枸杞庄园，研究了宁杞7号枸杞在不同灌溉量下枸杞在夏果形成期时的光合日变化特性。结果表明，在枸杞夏果形成期，不同灌溉量处理下宁杞7号的净光合速率呈双峰型，峰值出现在11:30、16:00时前后，出现了光合午休现象。枸杞受到水分胁迫之后，光合有效辐射较低，光合作用有所减弱。枸杞蒸腾速率和净光合速率的变化趋势较为一致，而叶片胞间CO₂浓度与净光合速率的变化趋势相反，呈先降后升再降，最后有所上升的趋势。随着灌溉量的减少，枸杞的蒸腾速率降低，胞间CO₂浓度增高。

The diurnal photosynthetic characteristics of Ningqi No.7 Lyciumbarbarum at summer fruit formation stage under different irrigation in Xizanwolfberry manor，Xiaoyanchi Beach， Zhongning County. The results showed that the net photosynthetic rate of“Ningqi No.7” Lyciumbarbarum under different water treatments during the summer fruit formation period of Lyciumbarbarum showed a double-peak pattern， with the peak at 11:30 and 16:00， and the photosynthetic lunch break occurred. After the wolfberry is exposed to water stress， the photosynthetic active radiation is lower， and the photosynthesis is weakened. The change trend of the transpiration rate and net photosynthetic rate of Lyciumbarbarum was relatively consistent. The intercellular CO₂ concentration of Lyciumbarbarum leaves had the opposite trend to the net photosynthetic rate. As the amount of irrigation decreases， the transpiration rate of wolfberry decreases， and the intercellular CO₂ concentration increases.

S567.1

中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室指令性基金项目“枸杞需水规律试验研究”(CAMP-201922)。