燕龙板栗光合作用及其相关因素的日变化

为了改进板栗栽培技术,提高其光合效率,以2年生板栗品种"燕龙"为试材,研究了板栗的光合作用及其相关因素的日变化。结果表明:板栗净光合速率的日变化呈双峰曲线型,有明显的午休现象,分别在10:00和15:00出现高峰,10:00的峰值较高,13:00~14:00出现"午休"现象;去雄后,板栗叶片光合速率下降;板栗叶片气孔导度日变化与光合速率的变化趋势一致,而蒸腾速率日变化呈单峰曲线型,峰值出现在13:00;胞间CO2体积分数在午休期间较高。午间随着光照强度的增加,气温和叶温升高,蒸腾速率增加,气孔导度和光合速率下降。

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.