基于虚拟植物的杨树冠层模拟及辐射传输研究

Research of poplar canopy simulation and radiation transfer based on virtual plant

在虚拟植物的研究领域中,冠层的模拟是非常具有实际应用价值的,其内容包括冠层中枝干的模拟、叶片的模拟、以及基于冠层几何形态模拟结果的太阳辐射传输、透光率、叶片总面积、叶片有效面积等特征的求算。本研究以农田防护林中生长的杨树为虚拟植物对象,首先应用数学函数图形方式模拟树的主干与枝干,再采用射线法实现杨树叶片的模拟,最后完成整个杨树的计算机模拟,并在虚拟杨树的模拟过程中,通过记录相关的信息值,再计算出杨树冠层的辐射传输。研究结果对于农田防护林效益评价、农林复合系统资源利用率的提高等方面均有重要的理论价值。

In the research field of virtual plant,the canopy simulation has very practical application values,including the simulation of branches in the canopy,and the simulation of leaf blade,and the calculations of solar radiation transmission,light transmittance,leaf area and other characteristics based on results of the canopy geometry simulation.In this paper,based on virtual poplar model in farmland shelterbelt,firstly applied mathematics function graphically to simulate the trunk and branches of a virtual poplar,then used the ray method to simulate leaf blades of poplar,finally finished the simulation of the whole poplar.In the process of the simulation of the virtual poplar,by recording the related information,this paper calculated the radiation transfer of the poplar canopy.Results of the research showed important theory values for benefit evaluation of farmland shelterbelt and the improvement of agro forestry system resource utilization.