油菜花后光合面积变化及其与产量的关系

油菜光合面积变化与干物质积累和产量的关系结果表明，初花期，盛花期叶面积系数（LAI）与干物质积累和产量呈抛物线关系，终花期LAI，终花期和成熟期角果皮面积系数（PAI）与干物质积累和产量呈显著线性正相关。花后LAI下降幅度越大，花后干物质净增量越低，花后PAI上升幅度加大，花后干物质净增量和产量增加，高产油菜的光合面积系数变化以LAI在初花期达最大值，盛花期略为下降，盛花后缓慢下降，花后PAI迅速增加为宜，施肥能有效调节油菜光合面积系数的变化，提高花后LAI和PAI，延缓花后叶面积的下降速度。

The relationship between yield and photosynthetic area after flowering in rapeseed

The experiment was conducted to study the relationships between the change of photosythetic area index and dry matter accumulation and yield in rapeseed. The dry matter accumulation and yield had close relationship with leaf area index (LAI) at first-flowering and full-flowering, that was expressed by parabolical curves. There were positive correlation between dry matter accumulation or yield and LAI at end-flowering, and pod surface area index (PAI) at end-flowering and maturity stage, respectively. The more reduced LAI after flowering, the less dry matter accumulated. The more PAI increased after flowering, the more dry matter accumulated and yield raised. Under high-yield cultivation, the changes of photosynthetic area after flowering, such as LAI got its maximum at first-flowering, and then decreased slowly, and PAI increased rapidly after first-flowering, were suitable. Fertilizer application might raise LAI and PAI after flowering and depress the reduction rate of photosythetic area after flowering.