中文摘要：

用Li-6400光合仪同时测定了CO2浓度为380和600μmol·mol-1条件下黄山栾树的光响应曲线和快速光曲线,分别采用不同模型进行了拟合。结果表明：直角双曲线模型和双指数方程拟合得到的最大电子传递速率远大于实测值;直角双曲线模型、非直角双曲线模型、单指数方程不能拟合黄山栾树存在PSⅡ动力学下调的快速光曲线,只有双指数方程和直角双曲线修正模型可以拟合黄山栾树存在PSⅡ动力学下调的快速光曲线,且可以计算它的饱和光强。综合拟合结果可知,直角双曲线修正模型不仅可以很好地拟合黄山栾树的快速光曲线,而且得到的最大电子传递速率和饱和光强与实测值相符合。此外,通过拟合植物的快速光曲和光响应曲线,还可以判断在饱和光强时它的电子传递速率与碳同化是否同时达到最大值。

英文摘要：

By using gas analyzer Li-6400,the foliar gas exchange and chlorophyll fluorescence of Koelreuteria bipinnata var.integrifoliola were measured under the CO2 concentrations of 380 and 600 μmol·mol-1,and the measured curves were fitted by different models.The results showed that the maximum electron transport rate fitted by rectangular hyperbola and double exponential equation were far higher than the measured data,rectangular hyperbola,non-rectangular hyperbola,and single exponential equation could not fit the rapid light curve with dynamic down-regulation of PSⅡ,and only double exponential equation and modified rectangular hyperbola could fit the rapid light curve with dynamic down-regulation of PSⅡ and correctly calculate the saturation irradiance,indicating that modified rectangular hyperbola could not only well fit the rapid light curve of K.bipinnata var.integrifoliola,but also make the simulated maximum electron transport rate and saturation irradiance accord with the measured data.Moreover,modified rectangular hyperbolic model could judge whether the simulated electron transport rate and CO2 assimilation synchronously reached the maximum values through fitting the rapid light curves and light response curve of plant photosynthesis.