为了探究谷子不同品种、各重要生育时期、不同叶位与光合生理指标之间的关系，通过对谷子光合蒸腾和叶绿素等生理参数进行采集与分析，研究归纳了谷子相关光合特性，结果表明：谷子在孕穗期的叶片净光合速率较拔节期和灌浆期分别高出247.7%和32%，蒸腾速率分别高出100.4%和104.7%，叶片气孔导度也较高，而胞间CO2浓度较低；灌浆期谷子顶三叶的净光合速率、蒸腾速率、叶片气孔导度、水分利用效率显著高出下部叶片，自上而下各叶位单叶的叶绿素含量呈现出由低到高再转低的变化趋势。

In order to know the relation between different varieties, different growth stages, different leaf positions and photosynthetic physiological Indexes. Through collecting and analyzing the data of photosynthetic and transpiration and chorophyl content in millet, the paper had study and sum up the photosynthetic physiological characteristics of millet. The results showed that: the net photosynthetic rate at booting stage was 247.7% and 32% higher respectively than the net photosynthetic rate at jointing stage and mid grain-filling stage, the transpiration rate at booting stage was 100.4% and 104.7% higher respectively than the net photosynthetic rate at jointing stage and mid grain-filling stage; intercellular CO2 concentration was lower jointing stage and mid grain-filling stage. The stomatal conductance was relatively higher than jointing stage and mid grain-filling stage; the top-three leaves' transpiration rate, stomatal conductance, intercellular CO2 concentration were significantly higher than the lower leaf. Chlorophyll content presented the trend from low in last glaciation to high in the middle and late holocene.