Study On Structure Regularity And Model Of Timbers Sort For Pinus Massoniana Lamb Plantation Of Fujian

In this paper,normal distribution and Weibull function were used to study the diameter of distribution, by chi-square test showed that both normal distribution and Weibull function could be a good description of Pinus massoniana Plantation in Fujian diameter distribution,and Weibull function fit better.Other studies showed that in the same stand when tree height and diameter at breast height was a power function if the diameter at breast height obey Weibull function, the tree height distribution was also subjected to the Weibull function, Masson Pine Plantation in Fujian tree height distribution and tree height curve studies had proved that this study had met the power function in the relationship between tree height, diameter at breast height. According to the study launched masson pine plantation in Fujian tree height results of the Weibull distribution function.This paper focused on the timbers sort structure law of Pinus massoniana Plantation in Fujian, including the diameter class of timbers from the structure and stand wood species lumber structure. Diameter classes of timbers from rate refered to the changes in the volume ratio of each wood species with diameter class, and the stand of timbers from the relationship between the stand average diameter at breast height and the volume ratio of each wood species. Related data collection combined with the clear cutting of the province’s50standard, Central section quadrature sample solved the sample trees of each species of wood timber volume and trunk volume,Using the SPSS software reaserch the wood species lumber structure of Fujian Masson Pine,research contents include the one-way and Standard Diameter Class of the wood species structure and the one-way and Standard of the stand wood species structure,residual sum of squares and R-squared are determined To the accuracy of the model fit.Used the total relative error (RS), the average relative error (E), the average absolute relative error (RMA) forecast accuracy P and F test statistical to judge the inspection system errors and significance test when the model fitting accuracy to meet the statistical requirements, Draw the each wood species optimal one-way and Standard ofdiameter class and stand in different contexts.At last, the simple taper equation and variable taper equation were discussed for the the structure of out put of wood sorts, and to explore the use of Taper Equation of the preparation of outturn tables of wood sorts.