木荷林中幼苗光合特性研究

Study on Photosynthetic Characteristics of Schima superba Seedlings

对木荷林林窗和林内生境下,不同龄级木荷幼苗的净光合速率日变化情况和光补偿点、光饱和点情况的研究,结果表明,3~4龄级木荷幼苗净光合速率日进程呈双峰型,其余龄级木荷幼苗净光合速率日进程呈单峰型。叶子飘构建的新光响应模型拟合效果三者中最佳,结果最接近实测值。林窗5~6龄级木荷幼苗光饱和点为1441.2124μmol·m^-2·s^-1,是2种生境下各龄级幼苗中最高的,该龄级对光适应的生态幅也最宽。

Through the window of Schima superba seedlings and forest habitat, not age class Schima superba seedlings of diurnal change of net photosynthetic rate and light compensation point, light saturation point was studied, the results showed that the forest habitat, the age of 3 to 4 levels of Schima superba seedlings the bimodal type, net photosynthetic rate, process the rest of the age class Schima superba unimodal type seedling net photosynthetic rate, process. Binomial regression model, non-rectangular hyperbolic model and new light response model constructed by Ye Zhi-piao were used to fit the light response curves of different age Schima superba seedlings under two kinds of habitats. The light saturation point of 5-6 years old seedlings was 1441.2124μmol·m^-2·s^-1, which was the highest of the seedlings in the two habitats.