常绿阔叶树种栲树是亚热带常绿阔叶林中的优势种之一。对比研究了林下、林窗和旷地3个光环境下栲树幼苗的光合特征参数、比叶质量、叶氮含量及叶解剖结构等,结果表明:林下栲树幼苗的光补偿点和暗呼吸速率低,比叶质量小,表观量子效率和光合氮素利用率高,利用弱光的能力强,在低光环境下保持了较高的光合能力;海绵组织发达且表皮细胞厚,是对凉爽环境的积极响应。在旷地,栲树的最大光合速率明显下降,暗呼吸速率显著升高,单位面积的叶氮含量较高但氮素利用率较低;叶厚度和栅栏组织厚度均增加,栅栏组织/海绵组织厚度比值也升高了,但栅栏组织不如海绵组织发达,不能适应高光环境。栲树幼苗在林窗有较高的光合能力,在林窗中能正常生长和更新。 Evergreen broad-leaved tree species Suaeda is one of the dominant species in subtropical evergreen broad-leaved forests. The photosynthetic characteristics parameters, specific leaf mass, leaf nitrogen content and leaf anatomical structure of Castanopsis fargesii seedlings were compared under three light conditions in understory, canopy and open fields. The results showed that the light compensation points Dark respiration rate, specific leaf mass, apparent quantum yield and photosynthetic nitrogen utilization rate were high, the ability to use weak light was high, and photosynthetic capacity was maintained under low light. Sponge tissue developed and epidermal cells were thick, Is a positive response to the cool environment. In the open field, the maximal photosynthetic rate of A. przewalskii decreased significantly, the dark respiration rate increased significantly, but the nitrogen content per unit area was higher but the nitrogen utilization rate was lower. The leaf thickness and palisade tissue thickness were increased, and the palisade tissue / sponge tissue The thickness ratio also increased, but the palisade tissue is less developed than the sponge and can not adapt to the high light environment. Sumac seedlings have higher photosynthetic capacity in the gaps and can grow and renew normally in the gaps.