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Donghua University (2010)

Study on Simulating & Virtual Growth Modeling of Sabina Vulgaris

Jiang Zhen Jie

Titre : Study on Simulating & Virtual Growth Modeling of Sabina Vulgaris

Auteur : Jiang Zhen Jie

Grade : Doctoral Dissertation 2010

Université : Donghua University

Résumé partiel
With the steady enhancement of human’s consciousness of its survival crisis, its desire to improve the living environment becomes more and more urgent. For a long time, the consequence of damaging and polluting environment is very dangerous and serious desertification is threatening the earth. How to cope with the degenerate environment ? How to improve living condition as soon as possible ? How to protect the earth ? There are impending issues that need to be resolved. In response to the above issues, the paper presented a thorough and deep study on Sabina vulgaris, a type of drought-resistant plant which not only survives, but essentially flourishes in hostile desert environment, in detail.The virtual growth of S-v shrub is discussed thoroughly in this paper sponsored by The National Natural Science Fund (Study on eco-physiological adaptability of Sabina vulgaris ant under drought stress). The study implemented modeling and simulating of S-v under in highly dry environments. Following are the main contents and conclusion of this research:In response to the limit of the Dual-scale automaton model in illustrating the clonal growth mechanism, the author presented an improved model based on reversible Semi-Markov chain. A topology model is proposed by combining with eco-physiological characteristics and growth feature of S-v. In the course of research, lots of results are analyzed carefully about internode, branching angle and curvature. These parameters are quantized for modeling. Clonal growth mechanism is studied by estimating the position of adventitious roots. The method mainly involved a slope function of sandland and internode data. The model can simulate vegetation process of S-v according to change of internode, branching angle and curvature. Clonal growth mechanism can be represented accurately. Moreover, the model can be visualized using C++ Builder. The visualization indicated that the growth model is highly consistent with the growth cycle of true S-v. The result provided a new method for research of S-v, more conducive to further investigation of S-v on drought. It is a new and more refined measure to earlier single pattern on study of S-v, which only contributed to its eco-physiological characteristics.Drought is a global issue that is confronting the earth and its importance can never be emphasized enough. Because many of the previous research efforts were primarily focused on S-v’s eco-physiological characteristics while paying little attention to its growth modeling, we have integrated and analyzed many results and experimental data in this research. Growth probability of S-v is created on drought, and the simulation of growth is implemented according to change of ground water level on drought. Particularly, the remarkable effect of groundwater level on its growth has been discussed in great detail. The linearity relationship between growth of S-v and groundwater level has been confirmed by computing the growth rate of tree height and radial growth. And the conclusion has been applied to the realization of the modeling on drought. In addition, the model offers a more intuitive and scientific approach to illustrating and verifying many S-v studies in recent years. The simulation system is able to calculate the position of the yielded adventitious roots via setting the slope of sandland. The simulation system can control the virtual growth of S-v by setting change of groundwater level. It makes it possible to forecast the growth of true S-v combined with ecosystem models.Ordinarily, the quality of 3D drawing and rendering can show the similarity of virtual model and true plant more effectively. And drawing and rendering of the S-v’s organs are very important issues and their speeds as well as difficulties should not be overlooked, especially in leaf drawing, which is usually very complicated. In order to solve the problem of drawing organ, shape features of S-v are analyzed.

Mots clés : dual-scale automaton clonal growth Sabina vulgaris anti-drought simulation marcostate microstate

Présentation (Dissertationtopic)

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