水稻不同穗型对冠层特征及群体光分布和物质生产的影响

研究了水稻不同穗型对冠层特征及群体光分布和物质生产的影响，结果表明，水稻不同穗型群体在光分布、消光系数；冠层形成与发展，以及干物质生产速率等方面存在明显差异，与半直立或弯曲穗型群体相比，在叶面积指数相同情况下，直立穗型群体的消光系数低，群体内部光分布比较均匀，因此，在叶面积较大时，直立穗型群体的干物质生产和产量高于半直立或弯曲穗型群体。但在叶面积指数较小时，弯曲穗型群体的光吸收量相对较多，更有利于

Effects of Different Panicle Type on Canopy Properties Light Distribution and Dry Matter Production of Rice Population

Using japonica rice cultivars, studies were made on the effects of panicle type on canopy properties, light distribution and dry matter production of plant population. The results showed that there were significant differences in light interception. K value, canopy development and the rate of dry matter production among populations with different panicle types. At the same LAI, the population with erect panicle plants had lower K value and more uniform light distribution as compared with that with curved or semi-erect panicle plants. The former, therefore, gave higher growth rate, dry matter production and grain yield than that of the latter due to the improved light interception and photosynthetic rate when large leaf mass was formed. In addition relationships between the fraction of radiation intercepted and the growth rate, and responsiveness of cultivars with different panicle types to nitrogen supply were also discussed.