长白山阔叶红松林主要树种光合作用的光响应曲线

以叶片光合作用观测资料为基础，利用直角双曲线与非直角双曲线两种方法对长白山阔叶红松林的主要建群树种红松(Pinus koraiensis)、紫椴(Tilia amurensis)、蒙古栎(Quercus mongolica)、水曲柳(Fraxinus mandshurica)光合作用的光响应曲线进行了拟合.结果表明，两种方法拟合结果不同，直角双曲线方法简单，但非直角双曲线的拟合结果更符合生理意义.由直角双曲线拟合得出4个树种的初始量子效率α、最大净光合作用速率P_max以及暗呼吸R_d大于非直角双曲线的拟合结果，而光补偿点L_cp随树种不同而有差异.两种方法得出4个树种的α、R_d大小顺序相同，分别是：α为水曲柳＞紫椴＞蒙古栎＞红松；R_d为水曲柳＞蒙古栎＞紫椴＞红松，但由两种方法得出的P_max、L_cp值大小顺序有差异.

Light response curve of dominant tree species photosynthesis in broadleaved Korean pine forest of Changbai Mountain

Based on the measurements of leaf photosynthesis, the light response curves of Pinus koraiensis, Tilia amurensis, Quercus mongolica and Fraxinus mandshurica photosynthesis in broadleaved Korean pine forest of Changbai Mountains were fitted with rectangle and non-rectangle hyperbolae. The results showed that rectangle hyperbola was simpler for fitting, while non-rectangle hyperbola was more reasomable because of its fitted results better matched physiological meanings. The values of intrinsic quantum efficiency for CO2 uptake (alpha), light-saturated net photosynthetic rate (Pmax), and dark respiration rate (Rd) of the four tree species were higher when fitted with rectangle hyperbola than with non-rectangle hyperbola, while that of light compensation point (Lcp) varied with tree species. The values of alpha and Rd obtained from the two hyperholae had the same sequences, i.e., F. mandshurica > T. amurensis > Q. mongolica > P. koraiensis for alpha, and F. mandshurica > Q. mongolica > T. amurensis > P. koraiensis for Rd, but for Pmax and Lcp, the sequences were not the same.