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用Ｌｉ－６２００光合测定仪对高产冬小麦两种不同分蘖成穗类型的６个品种群体光合速率进行了测定。结果表明，两类型小麦群体光合速率变化基本一致，全生育期内群体光合速率变化呈单峰型曲线，至挑旗期达最大值。小麦生长前、中期群体大小是决定光合能力的关键因素，开花期以后群体大小的影响逐渐变小。灌浆后期落黄好的品种群体光合速率高，反之则较低。小麦群体光合速率与叶面积系数、地上部干物质积累量和籽粒产量呈正相关［Ｒ＝０．８２８２＊、Ｒ＝０．９４８７＊＊和Ｒ＝０．９４６４＊＊（１３５万苗／ｈｍ２）、Ｒ＝０．７８８３＊（２７０万苗／ｈｍ２）］。证明建立合理的群体结构和延长灌浆期绿叶寿命，有利于提高后期群体光合速率与籽粒产量。
Using Li-6200 photosynthesis analyzer, the photosynthetic rate of six varieties with two tillers of high yielding winter wheat were determined. The results showed that the changes of photosynthetic rate of two groups of wheat were basically the same, and the photosynthetic rate of all groups showed a single peak curve during the whole growth period, reaching the maximum value at the flagging stage. The size of the population before and after wheat growth is the key factor that determines the photosynthetic capacity, and the effect of population size gradually diminishes after flowering. The photosynthetic rate of the yellow-drop varieties in the late filling stage was high, otherwise, it was lower. There was a positive correlation between photosynthetic rate and leaf area index, shoot dry matter accumulation and grain yield in wheat (R = 0.8282 *, R = 0.9487 ** and R = 0.9464 ** (1.35 million seedlings / hm2) , R = 0.7883 * (2.7 million seedlings / hm2)]. Proved to establish a reasonable population structure and extend the green leaf life of filling stage, is conducive to improving the late photosynthetic rate and grain yield.