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对大叶冬青叶片主要叶绿素荧光参数的季节日变化进行了测定。结果表明,所测定的几个叶绿素荧光参数在春季和秋季的日变幅小。Fm、Fm′、Fv、Fv/Fm、Fm/F0、Fv/F0在夏季8:00~18:00呈现明显先降后升的规律,其最低值出现在14:00左右,而NPQ则呈现先升后降的规律,其最高值出现在12:00左右。Fm、Fm′、Fv、Fv/Fm、Fm/F0、Fv/F0在冬季一天中的变化呈先升后降的单峰曲线,其最高值出现在14:00左右,而NPQ在一天中的变化情况则正好相反,其最低值出现在14:00左右。冬夏季节的Fv/Fm、Fm/F0和Fv/F0显著低于春秋季节,表明大叶冬青冬夏季节叶片PSⅡ反应中心电子传递效率和潜在活性显著低于春秋季节。NPQ参数在冬季和夏季显著高于春秋季节,表明大叶冬青在冬季和夏季吸收的光能有更大比例用于耗散而保护自身的光合机构。相关分析表明,NPQ在春、夏和秋季与其大气相对湿度呈显著负相关,与气温和光照呈显著正相关,而在冬季则与其气温呈显著负相关。夏季的Fm/F0、Fv/F0、Fv/Fm与其气温和光照呈显著负相关,而与大气相对湿度呈显著正相关。
Seasonal diurnal variation of main chlorophyll fluorescence parameters of leaves of Holly leaved was determined. The results showed that the measured daily variation of chlorophyll fluorescence parameters was small in spring and autumn. Fm, Fm, Fv, Fv / Fm, Fm / F0, Fv / F0 showed a trend of decreasing first and then rising from 8: 00-18: 00 in summer. First rise and fall of the law, the highest value appears at 12:00 or so. Fm, Fm, Fv, Fv / Fm, Fm / F0, Fv / F0 in the winter day showed a single peak curve first and then decreased, the highest value appears around 14:00, while NPQ in the day The change is the opposite, with its lowest value around 14:00. Fv / Fm, Fm / F0 and Fv / F0 in winter and summer were significantly lower than those in spring and autumn, indicating that the electron transport efficiency and potential activity of PSⅡ in leaves were significantly lower than those in spring and autumn. The NPQ parameters were significantly higher in spring and winter than in spring and autumn, indicating that a greater proportion of the light energy absorbed by S. solani in winter and summer was used to dissipate and protect its photosynthetic machinery. Correlation analysis showed that NPQ had a significant negative correlation with atmospheric relative humidity in spring, summer and autumn, a positive correlation with temperature and light, and a negative correlation with temperature in winter. Summer Fm / F0, Fv / F0, Fv / Fm and its temperature and light were significantly negatively correlated with the relative humidity of the atmosphere was significantly positive.