【作者】 王美丽；

【导师】 何东健；

【作者基本信息】 西北农林科技大学 ， 计算机应用技术， 2008， 硕士

【摘要】 随着农业信息技术的不断发展,虚拟植物越来越受到研究人员的广泛关注。虚拟植物是利用虚拟现实技术在计算机上模拟植物在三维空间中的生长发育过程,它以植物个体为研究对象,具有三维效果和可视化的功能,在农学、生态学、植物学、林学、虚拟教学等众多领域都有广阔的应用前景。根据研究的侧重点不同,虚拟植物的研究又分为地上部分研究和根系研究。由于根系环境的不可见性和复杂性,以及测量技术和理论方法的局限性,目前虚拟植物的研究主要集中在地上部分,对于根系部分的研究报道较少。本文选定小麦根系为研究对象,在参考国内外对植物根系模拟研究的基础上,建立了小麦根系的生长模型。小麦根系模型基于小麦根系的生理生态过程,对小麦根系的生长发育过程、根系中各根个体的空间分布进行模拟,最后实现了小麦根系的三维可视化模拟。本文的主要研究工作如下:(1)以“小麦根系生长规律研究”试验数据为依据,经观察、分析给出了影响小麦根系生长的几个基本参数,提出了基于生长方程理论和L系统结合的虚拟小麦根系可视化模拟方法。(2)基于生长方程理论建立了小麦根系数学模型,并在水培状况下采集大量的根系数据,利用Matlab软件对数据进行回归分析,建立了相应的生长方程。(3)在分析L系统理论的基础上,实现了二维L系统到三维L系统的转化;分析了特定植株小麦根系的拓扑结构,提取其L系统规则。(4)结合生长方程和L系统规则建立小麦根系模型,在VC++6.0的MFC构架下利用OpenGL技术,依据小麦根系生长规律,使用生长天数与L系统迭代规则相结合的方法实现了小麦根系的连续三维可视化模拟。同时借助OpenGL强大的三维图形库技术,实现了根系的缩放、旋转、平移以及颜色、灯光、平滑等处理。通过虚拟小麦根系生长,可以替代部分费时费力的农业田间与室内试验及优化农业管理措施、指导合理的灌溉与施肥,为研究作物的抗逆性及优化根系构型设计提供帮助,并可作为农业领域科技成果推广、实践教学的辅助手段。更多还原

【Abstract】 With agriculture IT continuously growing, researchers pay more and more attention on the study of virtual plant. Virtual plant is a kind of academic disciplines which is quickly developed with the technology of plant simulation. Virtual plant has a prosperously application prospect in agriculture science, ecology, botany, forestry, virtual teaching and so on. According to different researches and different aims, the research of virtual plant is divided into ground part and root system. The root system environment is lack of visibility and too complex as well as measuring the technology and theory method is limatete, so far, the research news report that the research virtual plant concentrates mainly on ground part ,there is less report about the root system.The wheat roots were selected as this paper’s research object, on basic study of relevant knowledge home and abroad, the wheat root growth model had been built. The wheat root model was based on chemophysiology and crop ecology. This reaearch realized the simulation of the growth process of wheat root system physiology organism’s habits and the distribution of root system. The main work of this paper are as follows:(1)According to the "Growth rule of wheat root system" experimental data, after observing, analysing, several basic parameters affecting wheat root growth were given. The wheat root simulation method was come up with by combing the theroy of growth equation model and L system.(2)The wheat root growth equation model was built on growth equation theory. The root system datum were largely collected under aquaculture. Using Matlab analysed the root data and gave corresponding growth equation.(3) On the basis of analysing L system theory, realized the two-dimensional L system conversion to three-dimensional L system. After studying particular topology of wheat root, established the L system of wheat root.(4) The three-dimensional visualized simulation was realized through using VC++’s MFC and OpenGL technology by Combing the growth equation and L system. At the same time, adopting the OpenGL powerful warehouse technology, realized root system readjusts oneself to a certain extent, rotates, translates and colour, light, smooth treatment.Virtual plant could replace some parts of expensive experiments which waste time and energy; Optimize agricultural management measure, guide rational irrigation and apply fertilizer; provide help to studying the crop resisting against nature, designe the optimization root system configuration; provide help to agriculture field science and technology achievement extends; provide the penetrating-rization auxiliary means for teaching practice.更多还原