摘要
对桃9个品种叶片光合特性的研究表明，在晴天自然条件下，净光合速率日变化呈典型的双峰曲线，第一次高峰出现在上午10时，光合“午休”现象比较明显，第二次高峰出现在下午16时。日平均净光合速率多在5-9CO2·mol·m^-2·s^-1之间，肉蟠桃的最高，艳光的最低，除天津水蜜与深州离核水蜜之间无显著差异外，其他品种之闻均有极显著差异。另外，环境因子对光合速率有很大的影响，以光合有效辐射温度、二氧化碳浓度的影响最大，因此可以通过育种和改善外界条件来提高果树的产量和品质。
The photosynthetic of leaves on nine Prunus Petica （L.） Batsch showed that the change of photosynthetic efficiency in every day is the typical twin peak curves under the natural sunny.The first peak has arised at 10 am. The phenomenon of ＂midday rest＂ is comparatively obvious ,the second peak has arised at 16 pro. The photosynthetic efficiency of every day is always between 5 and 9 CO2·mol·m^-2·s^-1, Roupantao is the highest, but Yangnang is the lowest. There is not significant diference between Tianjinshuimi and Shenzhouliheshuimi, while there is significant diference m other varieties. The enviroment factors have great effect on photosynthetic efficiency, such as photosynthetically active radiation（PAR）,temperature and CO2 concentration. Hence, by breeding and improving conditions in the outside we can lift yield and quality of fruit tree.
关键词
桃
光合作用
日变化
环境因子
Prunus persica （L.） Batch Photosynthesis Environment factors Day changes
