基于单叶尺度上的光强－光合响应以及CO2－光合响应测定，对长白山地区蒙古栎成树和幼树的光合特性分别进行了研究．结果表明，蒙古栎成树的光补偿点（Lcp）为21μmol/m2/s，光饱和点（Lsp）为1564μmol/m2/s，表观量子效率（a）为0.045μmol/mol；幼树的Lcp、Lsp、a以及CO2补偿点、饱和点分别为29μmol/m2/s、1581μmol/m2/s、0.049μmol/mol、73μmol/mol、625μmol/mol．幼树和成树具有相似的光响应特征，但前者的光合同化能力要高于后者．蒙古栎具有典型的喜光性，但对高光的利用效率要低于弱光．

he Photosynthetic characteristics of Quercus mongolica were studies based on the measurement of leaves photosynthesis under artificial controlled conditions of light intensities and CO2 concentration in region of Changbai Mountain. For mature trees, the light compensation point (Lcp), light saturation point (Lsp) and apparent quantum efficiency (α) were 21μmol/m2/s, 1564μmol/m2/s and 0.045μmol/mol, respectively. For young trees, the values of Lcp, Lsp, α, and CO2 compensation point, CO2 saturation point were 29μmol/m2/s, 1581μmol/m2/s, 0.049μmol/mol, 73μmol/mol, 625μmol/mol, respectively. The photosynthesis assimilation of young trees was more active than mature trees. It suggested that the Quercus mongolica was intrinsically helophytic plant, but the use efficiency of light quantum was low in strong light condition. The results also showed that the diurnal variations of net photosynthetic rate of young trees assume a typical midday depression pattern. Strong light intensity and high VPD were the key influencing factors.