水稻群体冠层光分布及光合作用模型

A Rice Canopy Light Distribution and Photosynthesis Model

作物冠层光分布及光合作用模型,是作物栽培学、作物育种学研究的共同基础,对优化设计和评价作物株型、模拟作物生长发育与对环境变化的响应研究都有十分重要的价值.本文根据水稻群体冠层结构的特点,在虚拟切层法的基础上,建立了水稻群体冠层光分布及光合速率模型,模型包括冠层形态子模型、冠层光分布子模型和冠层光合速率子模型等.利用本模型,对设定的15625种水稻株型的光合速率进行了模拟计算,获得水稻最佳株型模型.结果表明,水稻群体光合速率与叶片数、叶含氮量、叶长、叶宽和叶倾角等5因素密切相关;最佳株型的上述5因素在冠层上部取值大,向下逐渐变小.

Canopy light distribution and photosynthesis model is the basis of crop cultivation,breeding and informatics,and is significant to crop plant-type evaluation,optimization design and simulation of crop growth responding to environmental change.According to the rice canopy structure characteristics and the virtual slice layer method,we developed a rice canopy light distribution and photosynthetic rate model.This model mainly includes canopy shape model,canopy light distribution model,and canopy photosynthetic rate model.Based on this model,photosynthetic rate simulation was carried out on the supposed 15625 rice plant-types,and the best plant-type model was obtained.This research shows that photosynthesis is closely related to leaf number density,leaf nitrogen content,leaf length,leaf width,leaf angle and so on five factors;and on the best plant-type model,the values of the above five factors are larger in upper canopy,then gradually decrease downward.