竹子地下茎根系统的计算机模拟仿真
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摘要
为了定量研究竹子地下茎根系统(Bamboo Grove Underground Stems-RootSystem,简称BGUSRS)的形态结构特征及生长分布规律,本课题引入了虚拟植物技术,通过对隐藏于地下的BGUSRS的计算机模拟仿真,增强了研究方法的便捷性、动态性及可调控性,实现了对BGUSRS形态结构特征的量化描述及生长分布过程的动态直观显示,为研究竹林侵蚀控制和坡面保护的水平与效益提供了进一步的理论依据和技术支撑。
本研究采用虚拟植物技术,结合传统根系挖掘观测方法,在云南省新平县竹类栽培基地进行野外试验观测,定量测定了桂竹BGUSRS的形态结构及生长分布特征;运用几何结构建模方法,提取描述BGUSRS分布过程的特征参数,归纳总结生长发育规律,建立了符合植物学特征且便于编程实现的的生长模型;在Windows平台上应用Visual C++程序设计语言结合OpenGL三维图形技术开发了竹子地下茎根系统的模拟仿真程序。
运行本模拟仿真程序,用户通过输入以实测参数为依据的生长控制参数及生长时间,从主鞭开始,逐级递归调用根轴的生长函数,计算各根轴单位时间的生长量,确定其几何尺寸和空间位置并新建分根,累加每天的变化量,完成特定生长时间整个根系的分级生长,实时显示根系的三维图形,计算并输出描述生长分布的几何参数,从而实现对指定生长时间BGUSRS生长过程的模拟仿真。
以桂竹为实验对象,通过模拟数据和实测数据的对比,表明模型具有较好的精度,仿真效果较为逼真可靠,所建立的模拟仿真系统是有效的。利用此模拟仿真系统作为根系研究的工具,简化了BGUSRS形态特征的测定难度,改善了以往研究根系时的劳动量问题,获取了按照传统根系研究方法难以获得的详细生长分布参数,并且用户可以从任意角度对整个根系进行直观详细的动态观测,从而将传统的静态研究推向动态分析,使得BGUSRS研究效能得到显著提高
To study the morphological features, spatial distribution and dynamic growth of BGUSRS (Bamboo Grove Underground Stems-Root System), the method of computerized virtual plant simulation was introduced in this paper. With this method both structure and distribution of BGUSRS were successfully visualized, and the dynamic growth was also simultaneously simulated. Because of its high adaptability, efficiency and controllability, this method may play an important role on BGUSRS studies and provide theoretical support for erosion control and slope stabilization researches.
The field study was carried out in the Bamboo Cultivation and Experimentation Site of Xinping County, Yunnan Province. The traditional methods, including excavating, mapping and measuring, were applied in the field study to obtain the fundamental data on the morphological features and spatial distribution of BGUSRS. After that, based on the data observed from the field study, geometry structural modeling was used to establish the morphological parameters that described the growth and the distribution of BGUSRS. Meanwhile, according to these established morphological indices, a growth model that not only identically reflected the natural growth of BGUSRS but could be easily programmed with certain computer languages was also established. When this growth model was completed, the growth and distribution simulation based on it was program with the combination of Visual C++ language and the OpenGL 3-D graphics.
When running the program, a user-friendly interface appeared and a set of parameters describing BGUSRS properties such as length and growing time must be input for further running. It was controllable: different sets yielded different outcomes. The program worked in 3 stages. First, it executed the growth function that was called recursively to calculate the growth per time unit and determine the geometrics of primary underground stem. Second, it branched the primary underground stem into secondary ones and secondary into tertiary in accordance with branching rules preliminarily written in and founded a hierarchical skeleton network. Finally, visualize this network and summarize the outcome to the interface. This was how a certain BGUSRS growing progress was simulated in a given period.
This program used Phyllostachys bambusoides as the prototype. All the data and simulation were based on this species. The comparison of observed and simulated data by statistical analysis showed this simulation was feasible and reliable. Compared with traditional BGUSRS research methods, this imitation program provided a brand-new way of thought to this research area with accuracy and efficiency. It was labor-saving by reducing the determination on the morphological features of BGUSRS. Moreover, it was dynamic, with the vividly visualized 3-D rooting graphs facilitated related studies on BGUSRS that means you can obtain details of BGUSRS from any aspects.
本研究采用虚拟植物技术,结合传统根系挖掘观测方法,在云南省新平县竹类栽培基地进行野外试验观测,定量测定了桂竹BGUSRS的形态结构及生长分布特征;运用几何结构建模方法,提取描述BGUSRS分布过程的特征参数,归纳总结生长发育规律,建立了符合植物学特征且便于编程实现的的生长模型;在Windows平台上应用Visual C++程序设计语言结合OpenGL三维图形技术开发了竹子地下茎根系统的模拟仿真程序。
运行本模拟仿真程序,用户通过输入以实测参数为依据的生长控制参数及生长时间,从主鞭开始,逐级递归调用根轴的生长函数,计算各根轴单位时间的生长量,确定其几何尺寸和空间位置并新建分根,累加每天的变化量,完成特定生长时间整个根系的分级生长,实时显示根系的三维图形,计算并输出描述生长分布的几何参数,从而实现对指定生长时间BGUSRS生长过程的模拟仿真。
以桂竹为实验对象,通过模拟数据和实测数据的对比,表明模型具有较好的精度,仿真效果较为逼真可靠,所建立的模拟仿真系统是有效的。利用此模拟仿真系统作为根系研究的工具,简化了BGUSRS形态特征的测定难度,改善了以往研究根系时的劳动量问题,获取了按照传统根系研究方法难以获得的详细生长分布参数,并且用户可以从任意角度对整个根系进行直观详细的动态观测,从而将传统的静态研究推向动态分析,使得BGUSRS研究效能得到显著提高
To study the morphological features, spatial distribution and dynamic growth of BGUSRS (Bamboo Grove Underground Stems-Root System), the method of computerized virtual plant simulation was introduced in this paper. With this method both structure and distribution of BGUSRS were successfully visualized, and the dynamic growth was also simultaneously simulated. Because of its high adaptability, efficiency and controllability, this method may play an important role on BGUSRS studies and provide theoretical support for erosion control and slope stabilization researches.
The field study was carried out in the Bamboo Cultivation and Experimentation Site of Xinping County, Yunnan Province. The traditional methods, including excavating, mapping and measuring, were applied in the field study to obtain the fundamental data on the morphological features and spatial distribution of BGUSRS. After that, based on the data observed from the field study, geometry structural modeling was used to establish the morphological parameters that described the growth and the distribution of BGUSRS. Meanwhile, according to these established morphological indices, a growth model that not only identically reflected the natural growth of BGUSRS but could be easily programmed with certain computer languages was also established. When this growth model was completed, the growth and distribution simulation based on it was program with the combination of Visual C++ language and the OpenGL 3-D graphics.
When running the program, a user-friendly interface appeared and a set of parameters describing BGUSRS properties such as length and growing time must be input for further running. It was controllable: different sets yielded different outcomes. The program worked in 3 stages. First, it executed the growth function that was called recursively to calculate the growth per time unit and determine the geometrics of primary underground stem. Second, it branched the primary underground stem into secondary ones and secondary into tertiary in accordance with branching rules preliminarily written in and founded a hierarchical skeleton network. Finally, visualize this network and summarize the outcome to the interface. This was how a certain BGUSRS growing progress was simulated in a given period.
This program used Phyllostachys bambusoides as the prototype. All the data and simulation were based on this species. The comparison of observed and simulated data by statistical analysis showed this simulation was feasible and reliable. Compared with traditional BGUSRS research methods, this imitation program provided a brand-new way of thought to this research area with accuracy and efficiency. It was labor-saving by reducing the determination on the morphological features of BGUSRS. Moreover, it was dynamic, with the vividly visualized 3-D rooting graphs facilitated related studies on BGUSRS that means you can obtain details of BGUSRS from any aspects.
引文
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