测定祁连山中段5种典型植物的光响应参数，并用4种光响应模型进行拟合。结果表明：青海云杉（Picea crassifolia Kom.）、祁连圆柏（Juniperus przewalskii Kom.）、金露梅〔Dasiphora fruticosa (Linn.) Rydb.〕和垂穗披碱草（Elymus nutans Griseb.）的光合光响应曲线属于饱和趋近型，蕨麻〔Argentina anserina (Linn.) Rydb.〕的光合光响应曲线属于强度抑制型。4种模型均能较好地拟合供试5种植物的光合光响应曲线，但仅直角双曲线修正模型可以较好地拟合强度抑制型光合光响应曲线的光抑制阶段。直角双曲线修正模型除了对饱和趋近型光合光响应曲线光饱和点的拟合值偏高外，可以较好地拟合其他光响应参数。综上所述，直角双曲线修正模型为祁连山中段典型植物光合光响应曲线的最优拟合模型。

 The light response parameters of five typical plants in the middle part of Qilian Mountains were measured and fitted by using four light response models. The results show that the photosynthetic light response curves of Picea crassifolia Kom., Juniperus przewalskii Kom., Dasiphora fruticosa (Linn.) Rydb., and Elymus nutans Griseb. belong to the saturation approaching type, and that of Argentina anserina (Linn.) Rydb. belongs to the severe suppression type. All the four models can well fit the photosynthetic light response curves of five plants tested, but only the modified rectangular hyperbola model can well fit the photoinhibition part in the photosynthetic light response curve of severe suppression type. The modified rectangular hyperbola model can well fit the light response parameters except that the fitted value to light saturation point of photosynthetic light response curves of saturation approaching type is relatively high. Overall, the modified rectangular hyperbola model is the optimal fitting model for the photosynthetic light response curves of typical plants in the middle part of Qilian Mountains.