根据颈穗弯曲度将水稻划分为直立、半直立和弯曲三种穗型,并将弯曲穗型进一步分为穗弯曲型和颈穗弯曲型。穗型主要影响群体中上部的光分布。直立穗型群体中上部光照条件好,光的分布比较均匀;半直立和弯曲穗型群体穗位以下的光照条件远不如直立穗型群体。不同穗型群体下部光分布的差异不大。弯曲穗型在一定程度上降低了穗在群体中的相对位置,有利于上层叶片的光合作用,因而可能优于半直立穗型。穗型也是影响消光系数的重要因素之一,在比较不同穗型品种的冠层特征时,以消光系数作为综合指标有一定局限性。此外,还讨论了株形与光能利用的关系和直立穗型的利弊。 The rice was divided into upright, semi-erect and curved according to the curvature of the neck panicle, and the bending panicle type was further divided into the panicle bending type and the panicle bending type. The panicle mainly affected the light distribution in the upper part of the population. In the erect panicle type, the upper light condition was good and the light distribution was more uniform. The light conditions below the ear position of the semi-erect and bent ear type groups were far less than that of the erect panicle type group. There was no significant difference in the light distribution in the lower part of different panicle types. Bending panicle reduced the relative position of ear in the population to a certain extent, which was in favor of the photosynthesis of the upper leaves, which may be better than that of the erect panicle. The panicle type is also one of the important factors that affect the extinction coefficient. When comparing the canopy characteristics of different panicle varieties, the extinction coefficient as a composite index has some limitations. In addition, the relationship between plant shape and light energy utilization and the pros and cons of erect panicles were also discussed.