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以短枝型新红星幼树盆栽苗为试材 ,研究了水分胁迫对短枝型苹果叶片光合速率日变化的影响。结果表明 ,不同程度水分胁迫使光合速率日变化由单峰型曲线转变为双峰型曲线。轻度水分胁迫光合速率的日变化除与气孔因素有关外 ,还与非气孔因素有关 ;而中度、重度水分胁迫光合速率日变化主要与非气孔因素有关
The effects of water stress on the diurnal changes of photosynthetic rate of spur-apple leaves were studied by using sprouts of young spruce seedlings. The results showed that diurnal changes of photosynthetic rate varied from unimodal curve to bimodal curve with different degrees of water stress. The diurnal variation of photosynthetic rate of mild water stress was related to stomatal factors, but also to the non-stomatal factors. The diurnal changes of photosynthetic rate of moderate and severe water stress were mainly related to non-stomatal factors