| Virtual crop is a technology for the computer simulation of crop morphological structure and process of growth in 3D space, which has been into an important tool for botanist to study. It is one aspect of the computer technology applications in agriculture, and also a new method in crop cultivation, crop physiology and ecology, and crop breeding. Virtual crop can promote people's understanding and perception for the process in crop growth, which can provide technical support for analyzing of the relationship between structure and function of crops, designing ideotype, and controlling and regulating the growth mode.In this research, based on domestic and overseas relative studies and pot experiments of different varieties and nitrogen levels in 2007 to 2008 and 2008 to 2009,the morphological structural model of main stem leaves.branch leaves.main stem.branch,flower stalk,flower bud, and silique were constructed based on growth degree day(GDD) by using the system analysis method and mathematical modeling technique.and integrating the quantificational connection of every organ's morphologic growth and the major influencing factors of environment.And then the virtual display models of rapeseed flower and silique based on morphological structural models were developed on the plantform of Visual C++ by introducing the OpenGL and using object-oriented program design.The results were as follow:1. Models of the major effective factorsThe temperature,nitrogen effective models were constructed using mathematical modeling method.The morphologic dynamic development of every organs of rapeseed influenced by environment factors can be explained and reflected better by a series of effect factor models in practice.2. The morphological structural models of vegetative organs were constructed According to the data in 2007 to 2008,based on the logistic equation and the influence of Nitrogen,the morphological structural models or organs such as main stem leaves,branch leaves,main stem and branch of rapeseed were constructed whose drive variable is GDD.The models were validated by using data in 2008 to 2009,the result showed that the value of RMSE of morphological structural models of the length, width and petiole length of main stem leaf,the length and width of branch leaf,the height and width of main stem and the length branch were 1.212cm (n=265),0.791cm (n=265),0.467cm (n=194);0.307cm (n=60),0.218cm(n=60),4.234cm(n=87,0.091cm(n=87),2.811cm(n=60) respectively, which showed that the simulated value of rapeseed's main stem leaf,branch leaf,main stem and branch morphological structural models and the observed value were fitted better, the simulation of rapeseed organ's morphological structural model was accurate, and the prediction were better.3. The morphological structural models of reproductive organs were constructedBsed on the data in 2007 to 2008, the morphological structural model of flower stalk,flower bud and silique were constructed based on GDD and logistic equation by using the system analysis method and mathematical modeling technique,and integrating the quantificational connection of every organ's morphologic growth and the temperature and nitrogen. The models were validated by using data in 2008 to 2009,the result showed that the value of RMSE of morphological structural models of the length and width of flower stalk,flower bud,silique of main stem,first branch and secondry branch were 0.167cm (n=60),0.06cm (n=60),0.047cm (n=60),0.012cm (n=60),0.402cm (n=285),0.033cm (n=285),0.449cm (n=285),0.037cm (n=285),0.464cm (n=285),0.039cm (n=285) respectively, which showed that the simulated value of rapeseed's flower stalk, flower bud and silique of main stem.first branch.secondry branch morphological structural models and the observed value were fitted better, the simulation of rapeseed organ's morphological structural model was accurate, and the prediction were better.4. The virtual display models of rapeseed flower and silique were constructedBased on the morphological character of rapeseed flower and silique,the virtual display model of flower and silique were constructed using OpenGL functions and quadric surface.Further more,It fulfilled the dynamic simulation of the bloom of rape flowers and the visualization of silique population with the topological structure of rape flower and the morphological character of silique population. KEY WORDS:rapeseed; effective factors; morphological structural models; virtual display models; GDD; OpenGL... |
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