Research On Structure And Growth Of Pinus Tabulaeformis Stand Simulation In Beijing

In this paper,the Beijing Badaling Pinus tabulaeformis mountain stands as an example,the research to achieve the plantation(pure)stands simulation methods and the basic processes,and explore the application of a set of tree species in forest plantations in China the feasibility of simulation program,in order to gradually build a simulation system for the national forest cover has laid a foundation for plantation production and management provides a real and effective reference.Based on this study,stand structure and growth of the laws of reality,in other areas to make up for the lack of forestry characteristics simulation system deficiencies,and the application of independent research and development characteristics of China's stand on the prototype system simulation.The main contents of this paper include:(1)Stand structure of the rules of reality;(2) stand growth law research and modeling;(3)simulation of three-dimensional modeling of forest research;(4)based on stand characteristics Simulation of(5)of the prototype system design and development.(1)Stand structure of the rules of reality.Through practical sample surveys,as well as the accumulation of existing data to study the structure of the stand diameter,tree height structure and the spatial distribution pattern of the stand.Weibull function through the use of maximum likelihood structure of the stand diameter,tree height structure modeling;use of Ripley's K(d) function and the size ratio,angle of the stand-scale analysis of spatial pattern,finally stands structure and distribution pattern characteristic of the law.(2)Stand growth law research and modeling.First index stands plcomorphic structure to build a model,this study proposed the use of niching genetic algorithms to establish the status of Sloboda pleomorphic index equation,and achieved better results fit with the traditional genetic algorithm research,summed up the method is good or bad.Secondly,the establishment of a stand density index model.Finally,stand on different scales for the growth model,including model and single-tree stand model for simulation of the back stand ready to do a good job parameters.(3)stands simulation study of three-dimensional modeling.In this study,a stand for the scenes of simulated three-dimensional modeling techniques,namely model based on the OBJ file to the geometric modeling,the results in the stands true scale,rapid,and have been more satisfied with the results.(4)Based on the simulation of stand characteristics.First of all,based on existing data,in the stands with the simulation of the location of the trees,if not all of the real location information, this study has been based on sampling the spatial distribution pattern of the law stands,a whole stand to simulate the spatial pattern of law-lin distribution of sub-trees and made a very good simulation results,as second-class in the traditional course of the investigation,the location information is often missing,the method can be effective response to the true reality of the distribution of stands,and with some theoretical basis.Second,this study was the first attempt of the existing forest map data,by investigating some of the trees in the location information has been the pattern of distribution of stand space to simulate the distribution of forest trees.Finally, the simulation of forest trees to the form of animation,each frame tree model used to simulate real data,the data are based on the calculation of the growth model in front of the relevant parameters, has a certain reference value.(5)The prototype system design and development.This study of Chinese pine plantation forest demonstration area for the establishment of a forest stand management simulation platform prototype system-stand simulation system(Quick Stand System,QSS).The system is divided into six functional modules,including:2D layer management module,3D window module, attribute data management module,model management module trees,stand structural building blocks and stand growth prediction module,and the use of Badaling Chinese pine plantation has been tested with the test run,the realization of a simulation of plantation forest.