Study On Forestry Data Tab And Economic Mature For Schima Superba

Schima superba was mainly used as evergreen broad leaved tree in all parts of the Fujian province. Schima superba had great use value in forest fire prevention, landscaping, construction and other fields.Along with economic development, social demand for all kinds of High quality wood resources was rising at the same time. In order to make reference for forestry production of schima superba forest plantation, in this study, the 217 standard fields of schima superba which had different age, site and density were set up, surveyed and collected the relevant data. In this paper, the economic values in different conditions were reserched by some commonly used indicator of forestry,such as volume tab,growth forecast tab,economic mature harvest.Multiple model selection method selection and schima superba forest plantation volume Tab had been used.there were 2 evaluation index:correlation coefficient, the forecast precision,which were used for comprehensive analysis of the pros and cons of each volume model, to make the result of model selection more objective. Analysis finally draw the conclusion:yamamoto formula was the best binary volume model of schima superba plantation, best one volume equation was Burkhult formula.The two equations in the high precision, strong applicability, reliable results, on the basis of equation of the structure is simple, fully meet the requirements of the production of schima superba forest plantation in Fujian province.In the process of building schima superba forest plantation growth model which was related to site index and density,Sloboda polymorphic site index equation had been used to overcome the shortcomings in general polymorphic site index equation.Discussed and compared the superiority and inferiority of some growth equation,such as Logistic equation, Richard equation, Korf equations which were commonly used in the fitting of schima superba plantation area, in the end,Korf equation had been choosen.The immune evolutionary algorithm was used to solve the problems in the process of the parameters of the growth model solving process.Finally,growth and harvest forecast Tabs were set up for different site index,the density and initial conditions of schima superba plantation.In order to determine the quantity of material of schima superba forest plantation, must establish its planted out material rate, and the establishment of the material rate can not go without proper taper equation. On the choice of schima superba forest plantation taper equation, because number of sample wood was too small,the crossover method of modeling and cross check had been used to make sure the result of choice more reliable, at the same time with the diameter distribution model and the model of relative tree height which were based on the logistic equation, schima superba plantation planted out material rate is developed, for the research of economic maturity.In combination with of schima superba plantation growth harvest Tab and planted out material rate, discussed and compared the schima superba mature plantation economy age under different site conditions which was calculated by net present value method, the mean ratio method and the average annual earnings method. Then, with an average annual income method as the evaluation index, schima superba forest plantation were discussed under different site conditions of earnings trends over time.How lumber prices, costs, interest rate affect schima superba mature plantation economy had been discussed and compared.