用气体交换技术测定了四川省金佛山生长在一个典型林隙（林隙面积约为100 m2）不同位置的银杉(Cathaya argyrophylla)幼树叶片的部分光合生理生态指标，用改进的鱼眼镜头法测定了所测叶片的林冠开度（CO），并测定了这些银杉幼树个体的生长状况。研究了沿林冠开度梯度银杉幼树对光的适应性。银杉幼树在林隙边缘表现出较好的适应性，包括当年生树高生长速率（HG）、平均地茎生长速率（DG）和当年冠幅生长速率（CG）。随林冠开度的增加，单位叶面积的最大净光合速率（Pnarea）、暗呼吸速率（Rdarea）和单位叶面积的叶片干物质重（比叶重，SLM）明显增加，且相关显著。随林冠开度的增加，单位叶面积（LA）和单位叶干物质重的暗呼吸速率（Rdmass）略有降低， 而单位叶片干物质重的最大净光合速率（Pnmass）和单位叶片干物质重（LM）略有升高，但相关不显著。沿林冠开度的银杉幼树的形态可塑性要略低于生理生态可塑性，但差异不显著。
A preliminary study was carried out to study the acclimation of saplings of Cathaya argyrophyllato light across a gradient of canopy openness within a typi cal forest gap (≈100 m2) at Jin Fo Shan of Sichuan Province. Photosynthe sis related eco_physiological traits of fully expanded leaves were measured by gas_exchange techniques, the canopy openness of experimental leaves was measu red by a modified fish_eye method, and the current growth status of experimental saplings was investigated. Better acclimation of saplings at the site of gap ed ge was indicated by higher growth status of above_ground parts, higher height growth rate in last year, higher average basal stem growth rate, and higher crown expedition rate in last year than saplings in the understorey or gap center site s. With increasing canopy openness, the maximum net photosynthetic rate per leaf area, the dark respiration rate per leaf area, and specific leaf mass increased showing significant positive correlations to canopy openness. With increasing c anopy openness, leaf area and dark respiration rate per leaf mass decreased slig htly, the maximum net photosynthetic rate per leaf mass and single leaf mass increased slightly, but there were no significant correlations with canopy openness . Across the gradient of canopy openness, the phenotypic plasticity index was slightly lower than the ecophysiological plasticity index, but the differences were not significant.