摘要： 对夏玉米中熟品种超高产群体光合特性的研究结果表明，超高产群体叶面积发展动态为花前快，花后稳，蜡熟期衰减缓；光合势总量适度，经济产量形成期的阶段光合势高；群体光合速率高而稳；群体呼吸占群体光合的比率较低；净同化率与群体叶面积乘积高；总干物质积累量大，干物质生产率高，尤其生育后期干物质生产量大、生产率高是夏玉米超高产群体光合的重要特性之一。实现夏玉米产量水平13500kg/hm²；宜密度为75000株/hm²；左右；最大叶面积系数5.5左右；总光合势330万m²/hm²·d;群体光合速率（以CO₂重量计）全生育期平均65g/m²·h；群体呼吸速率（以CO₂重量计）平均18g/m²·h左右；净同化率平均78g/m²·d左右；干物质积累总量26000kg/hm²以上；乳熟至成熟期干物质生产率平均290kg/hm²·d以上。

关键词: 夏玉米, 超高产量, 光合特性

Abstract: The canopy apparent photosynthesis property in middle-ripe summer maize with supperhigh yield were reported.The results showed that the dovelopmental trends of canopy apparent leaf area of the maize was fast, steady and substractive respectively at postfloral, prefloral and dough stages; LAD was higher in the stage which economic yield shaping, but total LAD was appropriate; the canopy apparent photosynthesis rate was higher and steady. The ratio of canopy respiration was lower in the canopy photosynthesis; the higher dry matter productivety and multiplying canopy LAD by assimilation of total dry matter, especially, the higher dry matter production become at postgrowth stage and it was one of important property of canopy photosynthesis in summer maize with supperhigh yield.

Key words: Summer maize, Supperhigh yield, Photosynthesis property