中文摘要：

采用盆栽试验和模拟酸雨喷淋的试验方法，研究了重度酸雨（pH值＝2．5）、中度酸雨（pH值＝4．0）和对照（ pH值＝5．6）处理3a后，不同季节杉木幼苗叶片的叶绿素荧光特性及其生长差异。结果表明：重度酸雨对杉木幼苗的潜在活性（Fv/Fo）和非光化学淬灭系数（qN）有显著影响，其中8月份重度酸雨处理的株高增加量比中度酸雨和对照处理分别增加了98．98％和120．36％；而各酸雨处理对最大光化学效率（Fv/Fm）、光化学淬灭系数（qP）及地径生长的影响不显著。相同pH值酸雨处理下，季节变化对杉木幼苗的叶绿素荧光特性和生长量的影响较大，Fv/Fm、Fv/Fo、株高、地径增加量由大到小变化趋势均为8、11、5月份，其中8月份重度酸雨处理的Fv/Fm 和Fv/Fo 比5月份分别增加了25．7％和121．7％。二元方差分析显示，酸雨和季节的交互作用对杉木的Fv/Fo 和qN有显著影响。

英文摘要：

A pot experiment was conducted to study the chlorophyll fluorescence characteristics in leaf and growth of Cunning-hamia lanceolata seedlings in different seasons under simulated acid rain stress （heavy, pH=2.5; moderate, pH=4.0;control, pH=5.6） for three years.The PSⅡpotential activity （Fv/Fo） and non-photochemistry quenching （qN） are sig-nificantly influenced by the heavy acid rain, compared with moderate and control acid rain.Plant height issignificantly promoted by heavy acid rain, and is increasedby 98.98%and 120.36%compared with moderate and control acid rain in August.But the maximum PSⅡphotochemical efficiency （Fv/Fm）, photochemistry quenching （qP） and stem diameter are not influenced by theacid rain.In the same treatments, the chlorophyll fluorescence characteristics and growth are sig-nificantly influenced by seasons.Fv/Fm, Fv /Fo, height and diameter are in the order of August＆gt;November＆gt;May, and the Fv/Fm、Fv/Fo in Augustare 25.7%and 121.7%more than those in May under heavy acid rain.Fv/Fo and qN are signifi-cantly influenced by the interactions between acid rain stress and seasons change.