Wu Alex, Doherty Al, Farquhar Graham D, Hammer Graeme L
Centre for Plant Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Qld 4072, Australia.
Research School of Biology, Australian National University, Canberra, ACT 2601, Australia.
Funct Plant Biol. 2018 Feb;45(3):362-377. doi: 10.1071/FP17225.
Photosynthetic manipulation is seen as a promising avenue for advancing field crop productivity. However, progress is constrained by the lack of connection between leaf-level photosynthetic manipulation and crop performance. Here we report on the development of a model of diurnal canopy photosynthesis for well watered conditions by using biochemical models of C3 and C4 photosynthesis upscaled to the canopy level using the simple and robust sun-shade leaves representation of the canopy. The canopy model was integrated over the time course of the day for diurnal canopy photosynthesis simulation. Rationality analysis of the model showed that it simulated the expected responses in diurnal canopy photosynthesis and daily biomass accumulation to key environmental factors (i.e. radiation, temperature and CO2), canopy attributes (e.g. leaf area index and leaf angle) and canopy nitrogen status (i.e. specific leaf nitrogen and its profile through the canopy). This Diurnal Canopy Photosynthesis Simulator (DCaPS) was developed into a web-based application to enhance usability of the model. Applications of the DCaPS package for assessing likely canopy-level consequences of changes in photosynthetic properties and its implications for connecting photosynthesis with crop growth and development modelling are discussed.
光合操纵被视为提高大田作物生产力的一条有前景的途径。然而，进展受到叶片水平的光合操纵与作物表现之间缺乏联系的限制。在此，我们报告了一种适用于水分充足条件下的日冠层光合作用模型的开发，该模型利用C3和C4光合作用的生化模型，并通过简单且稳健的冠层阳叶-阴叶表示法将其扩展到冠层水平。冠层模型在一天的时间进程上进行积分，以模拟日冠层光合作用。对该模型的合理性分析表明，它模拟了日冠层光合作用和每日生物量积累对关键环境因素（即辐射、温度和二氧化碳）、冠层属性（如叶面积指数和叶角）以及冠层氮状况（即比叶氮及其在冠层中的分布）的预期响应。这个日冠层光合作用模拟器（DCaPS）被开发成一个基于网络的应用程序，以提高该模型的可用性。讨论了DCaPS软件包在评估光合特性变化可能产生的冠层水平后果以及将光合作用与作物生长发育建模联系起来的意义方面的应用。
