The Study Of The Functional-Structural Model Of Metasequoia

Plant growth modeling is a multidisciplinary subject including botany,mathematics and computer science.In the recent years,development of functional-structural models has become one of the important trends in plant modeling research. GreenLab is a functional-structural plant model, which builds the plant morphogenesis using algorithms that simulate both the organs production and the biomass production. It's based on the source-sink mechanism. It can depict the three-dimensional presentation of plants for use in analyzing individual tree growth and interactions between structural architecture and resource allocation in environments.Few studies have applied the GreenLab model to trees and more studies on crops.Metasequoia, rare plants, is the study object in this thesis. We have constructed the functional-structural plant model of Metasequoia based on the principles of GreenLab model. Destructive sampling was done to collect detailed data including structure and biomass measurements from 18 young Metasequoia trees. Direct parameters were attained from the measurement data and hidden parameters of the model were calibrated using the generalized least squares method.To prevent data loss and confusion, a coding system of recording data was presented in the thesis. As Metasequoia leaves and small collateral for shedding together, a new method of structuring leaves morphology was presented in the thesis. To regard them as a leaf, it can simplified morphology of the model and improved the effectiveness and versatility of the model.In concluding this work of our predecessors on the basis of technology trees for the study,the thesis focuses on the technology that integrate the intrinsic physiological process of plant with architectural model. We have constructed the functional-structural plant model of Metasequoia. It can simulate the growth of Metasequoia and output its three-dimensional view.