中文摘要：

研究了全光照和遮阴棚（7%全光照）两种光强生境下对马耳蕨叶绿素荧光参数的日变化过程。结果显示,日出后,全光照生境下,对马耳蕨叶片的最大光能转化效率（Fv/Fm）、有效光化学量子产量（Fv′/Fm′）、光化学淬灭系数（qP）逐渐下降,其中,Fv/Fm和qP的最小值出现在15：00,Fv′/Fm′的最小值出现在13：00,而非光化学淬灭系数CNPQ（NPQ）和表观电子传递速率（rETR）逐渐上升,并在11：10达到最大值,各项参数值直到第2天清晨才恢复到初始正常水平。遮阴棚环境条件下对马耳蕨反rETR日出后逐渐升高,11：00达到最大值,但仅为全光照下的33.7%,其他4项参数没有显著变化。研究表明,在全光照下对马耳蕨表现出抗光抑制的保护性反应,能够正常生长,不属于典型的阴生蕨类植物。

英文摘要：

Under full sunlight and 7 % of sunlight,daily variations of chlorophyll fluorescence parameters were explored in Polystichum tsus-simense.The results showed that after sunrise the maximal efficiency of PS Ⅱ（Fv/Fm）,the excitation capture efficiency of PS Ⅱ（Fv′/Fm′） and photochemical quenching（qP） decreased in P.tsus-simense under full sunlight,at 15：00 Fv/Fm and qP were the lowest,at 13：00 Fv′/Fm′ was the lowest.However,the relative electron transport rate（rETR） and non-photochemical quenching（CNPQ） increased and the highest were at 11：00.These 5 parameters could not be recovered until next morning.Under 7% of sunlight RETR increased after sunrise and the higest was at 11：00,but other 4 parameters changed little all the day.Results suggest that P.tsus-simense has photoprotective and grows well under full sunlight.Thus this plant is not a typical shade ferns.