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对不同季节交让木叶片叶绿素荧光参数的日变化进行了测定。结果表明,交让木各叶绿素荧光参数在春季和秋季的日变化幅度小。夏季8:00～18:00,F0(最小荧光)和NPQ(非光化学淬灭系数)呈现先升后降的规律,最大值分别出现在12:00和14:00,而Fm(最大荧光)、Fm′(光适应下的最大荧光)、Fv(可变荧光)、Fv/Fm(PSⅡ最大光能转换效率)、Fm/F0(电子传递效率)、Fv/F0(PSⅡ潜在活性)则呈现先降后升的规律,12:00出现最小值。冬季8:00～16:00,F0日变化幅度较小,而Fm、Fm′、Fv、Fv/Fm、Fm/F0、Fv/F0的日变化则呈现先升后降的单峰曲线,最大值出现在12:00～14:00之间,而NPQ在一天中的变化情况则正好相反,最小值出现在12:00～14:00。春季和秋季的Fv/Fm、Fm/F0和Fv/F0明显高于夏季和冬季,表明交让木在春季和秋季叶片PSⅡ光能转化效率、电子传递效率和潜在活性都明显高于夏季和冬季。交让木夏季和冬季叶片的NPQ参数明显高于春季和秋季,表明交让木叶片在夏季和冬季吸收的光能有较大比例用于耗散而保护自身的光合机构。
The diurnal variations of chlorophyll fluorescence parameters in different season seeding leaves were measured. The results showed that the diurnal variation of chlorophyll fluorescence parameters in spring and autumn was small. During the summer from 8:00 to 18:00, F0 (minimum fluorescence) and NPQ (non-photochemical quenching coefficient) increased first and then decreased. The maximum appeared at 12:00 and 14:00, respectively, while Fm (maximum fluorescence) , Fm ’(maximum fluorescence under light adaptation), Fv (variable fluorescence), Fv / Fm (maximum PSII conversion efficiency), Fm / F0 (electron transfer efficiency) and Fv / F0 (PSII potential activity) The law of the first drop after rising, 12: 00 minimum. In winter, the daily variation of F0 was smaller than that of winter, while the daily variation of Fm, Fm, Fv, Fv / Fm, Fm / F0 and Fv / F0 presented a unimodal curve, The value appeared between 12: 00-14: 00, while the change of NPQ in the day was just the opposite. The minimum value appeared at 12: 00-14: 00. The Fv / Fm, Fm / F0 and Fv / F0 in spring and autumn were significantly higher than those in summer and winter, which indicated that PSⅡ light energy conversion efficiency, electron transfer efficiency and potential activity of leaves in spring and autumn were significantly higher than those in summer and winter . The NPQ parameters of the summer and winter leaves were significantly higher than those of the spring and autumn, which showed that the light energy absorbed by the leaves during the summer and winter had a greater proportion of the light energy used to dissipate and protect themselves.