关键词: 扁桃, 桃, 净光合速率, 叶绿素荧光, 环境因子

Abstract: The photosynthetic characteristics of introduced almond (Prunus amygdalus cv.‘Nonpareil’) were studied in comparison with peach (Prunus persica cv.‘Qingfeng’). The curves of diurnal variation of net photosynthesis rate (Pn) in leaves of almond and peach showed two peaks , occurring at 11∶00 and 15∶00 , respectively. Midday depressions of Pn (11∶00 - 14∶00) were found in leaves of both almond and peach. Pn of almond leaves was significantly higher than that of peach between 10∶00 - 15∶00. Some physioecological parameters showed significant differences between almond and peach. The optimum temperature for Pn in almond and peach is 27 ℃and 23 ℃, respectively. The light compensation and saturation point of Pn in almond and peach leaves were 54μmol·m^-2·s^-1 and 1714μmol·m^-2·s^-1, 23μmol·m^-2·s^-1 and 1479μmol·m^-2·s^-1, respectively. The CO₂ compensation
and saturation point of Pn in almond and peach leaves were 68 μL·L^-1 and 838μL·L^-1, 55μL·L^-1 and 717μL·L^-1, respectively. The optimum degree of humidity for Pn in almond and peach is ≤0. 89 kPa and ≤1. 31 kPa. And the results of diurnal variations of chlorophyll fluorescence showed that Fv’/ Fm’、qP and ΦPS Ⅱin leaves of almond were significant higher than those of peach , and qN was lower than that of peach.

Key words: Almond, Peach, Net photosynthesis rate, Chlorophyll fluorescence, Environmental factors