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Predicting Models of Branch Growth and Knot Properties for Larch Plantation

Author: ZhangZhiChang
Tutor: LiFengRi
School: Northeast Forestry University
Course: Forest Management
Keywords: Larch plantation Branches resolution Analysis of Setsuko Growth model
CLC: S791.22
Type: Master's thesis
Year: 2010
Downloads: 45
Quote: 1
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Abstract


In this study, different age, density and site conditions larch (Larix olgensis Hengy) of plantations as the research object, based on the standard 19 to 95 standard wood trunk resolution, the branch analytic, and Setsuko profiling data, analysis and description size and variation of the total number of branches and twigs of larch plantations in different stand conditions within the canopy spatial distribution pattern of growth and development of; different size trees Setsuko (dead branches) to evaluate the size of the knots on The quality of wood; linear and nonlinear models, to establish shoot growth and the size of the knots prediction model to stand variables and forest variables as independent variables. The results show that: 1, larch CROWN within the total number of branches is mainly affected by the impact of crown length, no obvious relationship with other trees and stand factors. Due to the fierce competition between the branches, the vertical distribution of the frequency of the branches in the different relative branch in depth basically showing the status of the peak-to-valley staggered. For the same forest age stands, the vertical distribution of the branches of the forest stand density, stand age, density similar stands vertical distribution of branches has little effect. The larch plantation branches horizontal distribution can be evenly distributed to describe. 2, the theoretical growth equation based on linear and nonlinear regression model based on the branches of branches and tree variables size and branching structure model, the model includes: basal diameter of the branches, branch length, forecast forward to the branches angle and chord length model. The model can be well estimated the larch plantations crown structure. 3, larch plantation Setsuko diameter as Setsuko Health height increases with increasing the base of the crown to form a progressive value, the Mitscherlich equation can better forecast Setsuko diameter. Setsuko the raw angle can be used to DBH, the Setsuko diameter and Setsuko with raw height factor multivariate linear regression model to predict. Setsuko sound knots length prediction model shows the length of the sound section increases with the of Setsuko diameter and DBH increase; DBH, the Setsuko diameter and Setsuko raw height factor linear model to describe the knots loose The length of the section. 4, sub-section (dead branches) during growth and development can be divided into three stages: the branches normal growth stage, branches stop growing to the stage of death, Setsuko trunk concealed stage. The larch plantation Setsuko visible growth rings in the normal growth stage 1 to 36 (mean 10.9), The Setsuko visible number of rings and Setsuko life and Setsuko proportional to the height of the students. The larch plantation Setsuko missing rings is a common phenomenon, the number of missing rings from 0 to 19 (average 3.44), Setsuko lost the number of rings and, Setsuko life is positively correlated. In the meantime branches on tree growth does not contribute to, can be used as artificial pruning the beginning of time. Setsuko average time from death to be concealed for 12 years, representing about 51% of the total growth time of the branches, this period of time loose section of timber material influence. This study is reasonable to determine the height of different stand conditions the larch plantation artificial pruning and tending measures to control the size of the trunk on Setsuko (dead branches), improve the quality of wood provides a theoretical basis.

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Coniferous > Larch
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