Study On Growth Law Of The Pinus Elliottii Plantation In Hilly Sichuan Province

As environmental issues become more prominent, especially global environmental problems induced by human activity has become the hotspot of international scientific research. Among them, the greenhouse effect and global warming is a major challenge facing humanity. And forest plants to absorb carbon dioxide from the atmosphere and should be fixed in the vegetation or soil, thereby reducing the concentration of the gases in the atmosphere. Forests in reducing atmospheric concentrations of greenhouse gases and slow global warming, has the unique role of the very important. With the increase in demand for timber resources and environmental philosophy is deeply rooted in the hearts of the people, the timber obtained by the felling of natural forests must change direction to the development of fast-growing plantations of high yield and quality, faster, more, better access to timber resources on must be a better understanding of the structure and growth pattern of trees of the forest, in the actual production practice, the growth law model estimation method is the determination of the growth of the more popular and effective method, so study the growth law stands of forestry production management, as well as human production the improvement of the living environment has important significance and role.(1) The model about DBH: D= 61.632×(1-e-0.014A)0.983 The model about tree height:H= 21.107×(1-e-0.068A)1.243 The model about volume:V= 1.084×(1-e-0.043A)3.837(2) This PaPer study on Growth Law of the Pinus elliottii plantation in hilly Sichuan Province, its total of 30 plots of 30 sample wood-based growth law data, the application of statistical analysis software to study the model of each component and the total growth law of of larch single wood, fitting its growth law model. In the process of fitting the model of growth law, the first analysis of the independent variables of the model;Next, choose the model of growth law parameter estimation methods, and ultimately determine the use of non-linear least squares method to fit the model of the growth law.Create a the table about growth law of the Pinus elliottii plantation.(3)Then study the model evaluation, the paper argues that the total relative error RS, the average relative error E1, the average absolute relative error E2, estimated precision P, the correlation coefficient R2, residual standard deviation S and the residual sum of squares Q as the basic evaluationsimple.Filter out the best model about DBH, tree height and volume in the hilly region of Sichuan.(4) The results showed that:Model growth law estimation results reached widely precise effect of the expected overall estimate accuracy are up more than 95 percent to meet the accuracy requirements, it can be used in the actual production practice, and to facilitate the subsequent determination of growth law.