三个梨品种净光合速率变化及其影响因子的研究

Study on the net Photosynthetic Rate with Three Different Varieties of Pear

研究了黄金梨、华山梨和鸭梨三个梨品种净光合速率日变化规律、季节变化规律及其与影响因子的关系。结果表明:(1)梨树Pn日变化均呈现典型的双峰曲线,均有明显的"午休"现象;(2)梨树Pn季节变化也呈现双峰曲线,夏季Pn日均值明显降低;(3)梨树光合速率日变化和季节变化均与强光、高温和低湿的环境条件有关;(4)黄金梨、华山梨和鸭梨光合速率日变化和季节变化存在显著差异,表明梨树在光合特性上存在显著的品种差异性。

The change laws of net photosynthetic rate of three pear and its relationship with environmental factors were studied.The results showed that the trend of annual changes of net photosynthetic rate(Pn) in three pears were a typical double-humped curve and "noon break" obviously;the seasonal variation of Pn also appeared double-humped curve,and daily average was lower significantly in summer.The diurnal variation and seasonal variation of photosynthetic rate were related to both high intensity,high temperatur...