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油菜光合面积变化与干物质积累和产量的关系研究结果表明 ,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 results showed that there was a parabolic relationship between leaf area index (LAI) and dry matter accumulation and yield at the beginning of florescence, LAI at the final flowering stage, (PAI) had a significant linear positive correlation with dry matter accumulation and yield. The greater the decrease of LAI after anthesis, the lower the net increment of dry matter after anthesis, the increase of anthesis after anthesis, and the net increment and yield of anthesis after anthesis increased. The photosynthetic area coefficient of high-yielding rape reached its maximum at the first flowering stage and decreased slightly at the full-flowering stage, then decreased slowly after flowering and then increased rapidly after flowering. Fertilization can effectively regulate the photosynthetic area coefficient of rapeseed, increase LAI and PAI after anthesis, and slow down the declining rate of anthesis leaf area