Influence of canopy structure on light interception and productivity of greenhouse cucumber

在温室蔬菜生产中，温度、二氧化碳、水分和养分可以被调节到最优供应，光拦截是限制生产力的主要因素。在这些作物中，树冠结构可以通过植物分布或修剪来设计，使功能结构植物模型成为评价树冠结构、光截获和生产力之间关系的一个有趣的选择。黄瓜具有独特的行状结构，是空间异质树冠的典型代表。这个项目的目的是开发一个模型，允许研究冠层结构对黄瓜的光拦截、光合作用和干物质分配的影响。虽然结构部分目前正在开发中，但将开发用于辐射转移、光合作用和同化物分配的模块，并将其与拟议项目相结合。为了表示空间异质性，过程将以器官为基础进行描述。将进行5个实验，利用电磁数字化确定冠层结构，并测量空间光分布、光合作用和干物质分配。数据用于对三个模块进行参数设置和评估。

In greenhouse vegetable production where temperature, CO2, water and nutrients can be regulated towards optimal supply, light interception is the major factor limiting productivity. In these crops, canopy architecture can be designed by plant distribution or pruning, making functional-structural plant models an interesting option for the evaluation of the relationships between canopy architecture, light interception and productivity. Cucumber with its distinct row structure exemplify spatially heterogeneous canopies. The aim of this project is to develop a model that allows to study the effects of canopy architecture on light interception, photosynthesis and dry matter partitioning in cucumber. While the structural part is presently under development, the modules for radiation transfer, photosynthesis and assimilate allocation are to be developed and coupled within the proposed project. To represent the spatial heterogeneity, processes will be described on an organ basis. Five experiments will be conducted in which canopy structure is determined by electromagnetic digitising, and spatial light distribution, photosynthesis and dry matter partitioning are measured. Data are used to parameterise and evaluate the three modules.