【摘要】 以’新9号’扁桃为试材,对其主要光合特性及其影响因子进行了研究,结果表明,旱作扁桃的光合作用受叶片内部气孔阻力和蒸腾速率及外部光量子通量密度等因子的影响。旱作扁桃的光饱和点为865μmol/(m2·s),光补偿点为32 2μmol/(m2·s),灌水扁桃的光饱和点为1120μmol/(m2·s)。净光合速率的日变化在夏季晴天呈双峰曲线,蒸腾速率的日变化亦呈双峰曲线型,但第一高峰滞后于净光合速率。气孔阻力的日变化为"V"型曲线,其低谷与净光合速率的第一个高峰相吻合,之后持续增高。更多还原

【Abstract】 The leaf of almond under no water condition was regulated by stoma and transpiration rate and affected by photon flux density. Light saturation point of photosynthesis (LSP) and light compensation point for no water condition almond leaves was 865 μmol/(m2·s) and 322 μmol/(m2·s) respectively.LSP was 1 120 μmol/(m2·s) in watering almond.The curve of diurnal variation of almond leaf net photosynthetic rate (Pn) was demonstrated in two peaks in clear days. Transpiration rate was two peaks too, but first peak was after the first peak of Pn. The curve of diurnal variation of stomata resistance (Rs) was demonstrated in "V" type in clear days, and the valley of Rs coincided with the first peak of Pn,then RS increased steadily.更多还原