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以不同品种丁香属植物为试材,采用便携式光合测定系统,研究了不同光照对丁香光合生理的影响,并测定了6种丁香的光响应曲线。结果表明:全光照下,布氏丁香和红丁香的净光合速率呈现双峰变化曲线,平均净光合速率比在庇荫条件下高出20倍以上。全光照下,光能利用效率和水分利用效率的高峰值出现在6:00和16:00,庇荫条件下,则是10:00—14:00光能利用效率最高,10:00左右水分利用效率出现高峰值。蒸腾速率的日变化与净光合速率存在明显的相关性,全光照下气孔开度显著高于遮荫条件下。光补偿点为52~90μmol·m-2·s-1;光饱和点在800~1 400μmol·m-2·s-1,也说明丁香属为阳性植物。不同丁香种类的光合能力,以什锦丁香最高,最大净光合速率达20μmol·m-2·s-1;小叶丁香最低约8μmol·m-2·s-1;朝阳丁香、北京丁香、垂丝丁香和四川丁香在13μmol·m-2·s-1左右。
The effects of different light on the photosynthetic physiology of clove were studied using a portable photosynthesis system with different varieties of Syringa as test materials. The light response curves of 6 cloves were measured. The results showed that under full light, the net photosynthetic rate of clove and red clove showed a bimodal curve, with the mean net photosynthetic rate more than 20 times higher than that under shade. Under full illumination, the peak value of light energy use efficiency and water use efficiency appeared at 6:00 and 16:00, while under shading condition, the light energy utilization efficiency was highest at 10: 00-14: 00 and water use efficiency was around 10: 00 Peak efficiency appears. The diurnal variation of transpiration rate and net photosynthetic rate have obvious correlation, the stomatal opening under full light is significantly higher than that under shading condition. The light compensation point was 52 ~ 90μmol · m-2 · s-1 and the light saturation point was 800 ~ 1400μmol · m-2 · s-1, which also indicated that Syringa was a positive plant. The photosynthetic capacity of different species of clove was the highest with the highest proportion of lilac, the maximum net photosynthetic rate was 20μmol · m-2 · s-1 and the lowest was about 8μmol · m-2 · s-1. And Sichuan cloves at 13μmol · m-2 · s-1 or so.