基于三维模型的枇杷冠层光截获模拟与分析

利用点云数据与L-系统规则结合建模的方法，生成精细与高真实感的枇杷果树模型；利用辐射度模型模拟计算了枇杷冠层截获的光合有效辐射（PAR），并从受光面积与光合速率的角度对不同冠形的枇杷冠层光截获效率进行了定量化分析。结果表明：植物冠形对于入射光的响应有明显差异；经过比较，枝叶排列较为开阔且均匀的冠形光截获量与光合速率更优，冠层整体日平均直射PAR与散射PAR分别为154.77 umol·m-2·s-1与47.20 umol·m-2·s-1，日最高光合速率为3.97umol·m-2·s-1。模拟结果与实际情况基本一致，合理可信。研究结果可为农业生产管理以及果树形态设计提供了科学依据与参考。

Simulation and analysis of light interception within loquat canopy based on 3D model

Combine point cloud data and L-system rules to generate accurate and highly realistic loquat tree model. The radiosity model was used to simulate the photosynthetically active radiation (PAR) intercepted by the canopy, and the light interception efficiency of the fruit tree canopy with different crown shape was quantitatively analyzed from the perspective of irradiated area and photosynthetic rate. The results showed that the response of plant canopy to incident light was significantly different. From the comparison, the crown shape with more open branches and leaves had the optimal light interception and photosynthetic rate. Its average direct PAR and diffuse PAR were 154.77 umol·m-2·s-1 and 47.20 umol·m-2·s-1 , while the maximum photosynthetic rate was 3.97umol·m-2·s-1 in a day. The simulated results were basically consistent with the actual situation, which were both reasonable and credible. The research result can provide scientific basis and reference for agricultural production management and design of fruit tree shape.