提出基于辐射度模型模拟单株虚拟植物冠层光合有效辐射分布的技术流程,采用半立方体算法计算辐射度模型的形状因子,逐步求精迭代法解辐射度线性方程组,计算虚拟植物模型任意空间位置的辐射度值和能量值.通过对比基于光线跟踪模型和辐射度模型模拟冠层太阳直射光合有效辐射,不仅发现基于两种模型的模拟结果具有较好的一致性,而且基于辐射度模型的模拟更具合理性.最后,分析冠层净光合速率进一步验证基于辐射度模型模拟冠层光合有效辐射的有效性.%This paper proposes a method, which is based on radiosity simulating the 3D distribution of photosynthetic active radiation of virtual plant canopy. Firstly, the radiosity model is obtained by using the semi-cube algorithm of form factor. Then, linear equations are solved by incremental refinement radiosity iterative solution method. Finally, the value of radiosity and energy of virtual plant model at any spatial location are calculated. Compared with ray tracing model simulating direct sun canopy PAR, the results of the radiation model are not only good and consistent, but also more reasonable. Analysis on canopy net photosynthetic rate further validates the effectiveness of the proposed method.
展开▼
