摘 要 ：根据 SPAC理论建立了一个冬小麦光合和蒸散的耦合模型。冬小麦 CO2 通量包括冠层光合、呼吸和土壤呼吸。冠层光合采用了 Farquhar光合作用生化模型 ,并通过冠层阻力的参数化将光合作用与蒸腾作用耦合起来。用涡度相关方法观测了 CO2通量 ,对模型进行了验证 ,结果显示模型可以较好地模拟 CO2 通量日变化过程。对模型的敏感性分析发现日间 CO2 通量最敏感的参数是初始量子效率。其次 ,CO2 通量对光响应曲线凸度、CO2 补偿点、凋萎点和叶面积指数的变化也有着较强的敏感性 ;夜间 CO2 通量敏感的参数是最适温度下 Rubisco催化能力和暗呼吸参数。
Abstract:A coupled photosynthesis-evapotranspiration model over winter wheat was developed according to the theory based on SPAC. The model consists of three submodels, i.e., a canopy evapotranspiration model, a canopy photosynthesis model and a model of water and heat transfer in soil. The canopy evapotranspiration model comprises a solar radiation transfer sub-model, a heat radiation sub-model, an energy balance sub-model and a canopy resistance sub-model. The canopy photosynthesis model comprises a leaf photosynt...