基于株型的水稻冠层光合生产模拟

摘要

By using canopy-light-distribution-based photosynthetic model, and designing various combinations of model input parameters for compact and loose plant types of rice, quantitative analyses were made on the diurnal variation in extinction coefficient of canopy direct radiation with different plant types, the vertical distribution characteristics of direct radiation at noon and of photosynthetic rate within canopy, the characteristics of canopy photosynthetic rate with the changed leaf area index (LAI)under different radiant intensities, as well as the diurnal variation of canopy photosynthetic rate under different radiant intensities.The results showed that the high yield potential of compact plant type in rice relied on higher LAI, leaf photosynthetic efficiency,solar altitude and the intensity of solar radiation. These results would provide a support on cultivation for high yield and optimal design of plant type in rice crop.%利用基于冠层光分布的光合作用模型,以紧凑型和松散型2个不同株型水稻冠层为对象,通过设计不同的模型输入参数组合,定量分析了不同株型水稻冠层直接辐射消光系数的日变化特征、正午时刻直接辐射在冠层内的垂直分布特征、冠层内光合作用速率的垂直分布特征、不同辐射强度下冠层光合作用速率随叶面积指数的变化特征及其日变化等.结果表明,紧凑型的增产潜力依赖于较大的叶面积指数、叶片光合效能、太阳高度角和太阳辐射强度等.研究结果为水稻高产栽培及理想株型的优化设计提供了支撑.