油菜地上部干物质分配与产量形成模拟模型

利用油菜器官生长与发育进程及环境因子之间的定量关系，构建了基于分配指数的油菜地上部器官干物质分配动态模拟模型.各器官干物质分配指数随着生理发育时间而变化，基因型、播期、氮素及水分水平影响各器官干物质在地上部分配的大小.其中，氮素营养水平对绿色叶片干物质分配影响最大，氮素营养水平越高，绿色叶片分配指数越大；播期影响角果分配指数，晚播的角果分配指数高于早播.模型引入氮素营养指数、水分及播期影响因子来定量油菜各器官在实际生产条件下的分配强度，同时考虑了品种遗传特性的影响.通过不同品种氮肥处理试验建立模型，利用不同品种播期试验资料对模型进行了初步检验，表明模型具有较好的预测性和适用性.

Dynamic simulation on shoot dry matter partitioning and yield formation of rapeseed.

Based on the quantitative relationships between rapeseed growth and environmental factors,a simulation model was developed to estimate the shoot dry matter partitioning and yield formation of rapeseed.The dry matter partitioning indices of green leaf,stem and pod varied with the physiological development,and were influenced by the genotype,sowing date,nitrogen level and water status.Green leaf dry matter was regulated by nitrogen nutrition index(NNI).The higher the NNI,the higher the partitioning index of green leaf was.The factor of sowing date was introduced to regulate the partitioning index of pod.A delayed sowing date often induced an increased partitioning index of pod.The validation with different data sets involving variety,sowing date,and nitrogen application rate showed that this model had a good predictability and practicability.