榉树和黄连木叶绿素荧光特性的比较研究

通过对榉树和黄连木一年生苗叶绿素荧光参数试验研究,结果表明:(1)榉树和黄连木的叶绿素荧光参数日变化进程不尽相同。(2)光强是影响榉树和黄连木光化学效率和PSⅡ的潜在活性日变化最直接最重要的环境因子。光化学淬灭系数qP和qN与环境因子的关系模型在不同的树种之间存在差异,湿度对榉树的qN影响较大,光强对黄连木的qN影响较大。(3)黄连木各种叶绿素荧光数值偏低是其前期营养生长缓慢的内在原因,榉树虽受到不同程度的光抑制,但仍保持较高的光合能力。

Comparison Study on Chlorophyll Fluorescence Parameters Between Zelkova schneideriana and Pistacia chinensis

Through experimental study on chlorophyll fluorescence parameters of one-year seedlings including Zelkova schneideriana and Pistacia chinensis,the results showed that（1） Daily changes of chlorophyll fluorescence parameters in Z.schneideriana and P.chinensis were a bit different.（2） Light intensity was the directest and most important environmental factor which affected the diurnal variations of photochemical efficiency and PSⅡpotential activity in two kinds of tree species.the relationship models between photochemical quenching coefficient（qP or qN ） and environmental factor were different from tree species,and humidity had the greater impact on the qN in Z.schneideriana,light intensity had the greater impact on the qN in P.chinensis.（3）The low value of chlorophyll fluorescence parameters of all kinds in P.chinensis was the underlying reasons which led to its slower vegetative growth at the stage of seedling,while Z.schneideriana was subject to the photoinhibition of different degrees,but still maintained a higher photosynthetic capacity.