Diurnal Variations of Photosynthesis in Yanlong Chestnut and Some Related Factors

In order to improve cultivation techniques of chestnut and enhance photosynthetic efficiency,diurnal variations of photosynthesis and some related factors were researched,taken Yanlong chestnut with 2 years as materials.The results showed that the curve of diurnal variations of net photosynthetic rate had 2 peaks,which were at 10:00 and 15:00 respectively,and midday depression was significant at 13:00-14:00;net photosynthetic rate was decreased after removing stamens;the trend of diurnal variations of stomata conductance was consistent with that of photosynthetic rate,but that of transpiration rate had only a peak which appeared at 13:00;intercellular CO2 concentration was high during midday depression.Air temperature,leave temperature and transpiration rate were increased with increasing of light intensity at noon,while stomata conductance and photosynthetic rate were decreased.