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白首乌叶片光合日变化曲线呈明显双峰型,峰值分别出现在上午9:00～10:00时和下午3:00时左右,在高光强下中午有明显 午休 现象.叶绿素荧光参数Fv/Fm和ФPS 在晴天中午明显降低,说明田间白首乌叶片在晴天中午经常发生光抑制,高光强和高温是发生光抑制的主要原因.
The curve of diurnal photosynthesis of the leaves of C. przewalskii showed a bimodal pattern, with the peaks at 9: 00-10: 00 am and 3: 00 pm, respectively, with noon nap at high light intensity. The chlorophyll fluorescence parameters Fv / Fm And ФPS decreased significantly at noon on sunny day, indicating that the leaves of whitefowl shrubs often photoinhibited at noon on sunny days. High light intensity and high temperature were the main reasons for photoinhibition.