CAJ | 학술논문

对冬季不同黄化等级的香樟叶片主要叶绿素荧光参数的日变化进行了测定。结果表明：从08：00-16：00，健康和轻度黄化香樟F0（最小荧光）、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）均呈现先升后降的单峰型，最大值出现在12：00-14：00。而NP ，Q（非光化学淬灭系数）在一天中的变化情况则正好相反，呈现先降后升的单谷型，最小值出现在12：00-14：00，中度和重度黄化香樟的各项叶绿素荧光参数变化不明显，呈现水平趋势。健康香樟的Fv/Fm 日均值显著高于黄化香樟，中度和重度黄化等级的香樟则无显著差异，表明健康香樟的PSⅡ光能转化效率明显高于黄化香樟。随着黄化程度的加剧，Fm/F0、Fv/F0的日均值逐渐降低，表明PSⅡ电子传递效率和潜在活性逐渐降低。黄化香樟的NP，Q日均值显著高于健康香樟，且随黄化程度的加深而增大，表明香樟叶片黄化越严重，其吸收的光能用于热耗散而保护自身光合机构的比例越大。
대동계불동황화등급적향장협편주요협록소형광삼수적일변화진행료측정。결과표명：종08：00-16：00，건강화경도황화향장F0（최소형광）、Fm（최대형광）、Fm′（광괄응하적최대형광）、Fv（가변형광）、Fv/Fm （PSⅡ최대광능전환효솔）、Fm/F0（전자전체효솔）、Fv/F0（PSⅡ잠재활성）균정현선승후강적단봉형，최대치출현재12：00-14：00。이NP ，Q（비광화학쉬멸계수）재일천중적변화정황칙정호상반，정현선강후승적단곡형，최소치출현재12：00-14：00，중도화중도황화향장적각항협록소형광삼수변화불명현，정현수평추세。건강향장적Fv/Fm 일균치현저고우황화향장，중도화중도황화등급적향장칙무현저차이，표명건강향장적PSⅡ광능전화효솔명현고우황화향장。수착황화정도적가극，Fm/F0、Fv/F0적일균치축점강저，표명PSⅡ전자전체효솔화잠재활성축점강저。황화향장적NP，Q일균치현저고우건강향장，차수황화정도적가심이증대，표명향장협편황화월엄중，기흡수적광능용우열모산이보호자신광합궤구적비례월대。
The daily changes of chlorophyll fluorescence parameters of Cinnamomum camphora leaves at different levels of etiolation were studied .The results showed that the F0(minimal fluorescence ),Fm(maximal flu-orescence),Fm′(actual maximal fluorescence ),Fv(variable fluorescence ),Fv/Fm(optimal/maximal photochemi-cal efficiency of PSⅡ),Fm/F0(electron transfer rate ),and Fv/F0(potential activity of PSⅡ) first increased and then descended in the healthy and light-etiolated camphor leaves between 08:00-16:00,and the highest values occurred between 12:00 to 14:00.The daily change trend of N P,Q(non-photochemical quenching ) was contrary to those parameters mentioned above ,the trend was first increasing and then descending ,and the lowest values of Fm/F0 and Fv/F0 occurred in the period of 12:00 to 14:00,the chlorophyll fluorescence parameters showed a flat trend in moderate-and severe-etiolated camphor leaves .The average values of Fv/Fm in health camphor leaves were obviously higher than those in the etiolated camphor leaves .The maximal photochemical efficiency of PSⅡin the healthy camphor leaves was higher ,the average electron transfer rate and the potential activity of PSⅡshowed a descending trend .The daily average value of N P,Q in the etiolated camphora leaves was obviously higher than that in the healthy camphor leaves ,and increased with the increase of etiolation degree ,indicating that the more seriously the leaves were etiolated the higher proportion of light energy was absorbed by camphor leaves to avoid the destruction of photosynthetic tissue through hot dissipation .