Primary Study On The Reaction Wood Of The Artificial Inclined Trunk

In this research, the typical reaction wood, such as the poplar and the pine, are studied. Through the artificial cultivating and controlling the angle of poplars and pines trunks with the same environments and conditions, the reaction wood were induced. Through using of the growth stress detection technology and tracking measurement, the change of the growth character, the growth strain, the basic density and the shrinkage property were measured to analyze the change of the growth character, the growth strain, the basic density and the shrinkage property in different angles and times and find the relationship between the basic density, the shrinkage property and the growth strain, it will prove the scientific information for the artificial forest cultivation of the plantation and the utilization of the action wood. The main results are as following:1. The effect of the different angle on the growth character of the reaction wood: There is a negative correlation between the tree height and the angle of poplars and pines. The"P"value of poplars is significant at the level of 0.001 and the P value of pines is significant at the level of 0.05. The variation degree of pine heights is much smaller than poplar heights. There is a negative correlation between the tree base diameter of poplars and the angle, and the"P"value is significant at the level of 0.001. There is no significant relation between angles and tree base diameters in pines.2. The effect of the angle on the growth strain absolute size of the reaction wood: Results of the variance analysis of the relation between the angle and the growth strain absolute size are significant in poplars and pines. There is a positive correlation between the angle and the growth strain absolute size in poplars and pines.3. The effect of the angle on the basic density of the reaction wood: The basic density of poplars and pines in the reaction wood area are both larger than the opposite wood area in different angles. Results of the variance analysis of the relation between the angle and the basic density are both significant in the reaction wood area and the opposite wood area. There is a positive correlation between the angle and the basic density both in the reaction wood area and the opposite wood area of poplars and pines.4. The effect of the angle on the shrinkage property of the reaction wood: The axial shrinkage of pines is much larger than the axial shrinkage of poplars in both areas. Axial shrinkages in the reaction wood area of poplars and pines are much larger than axial shrinkages in the opposite wood area. Results of the variance analysis of the relation between the angle and the axial shrinkage, the radial shrinkage and the tangential shrinkage of poplars and pines are significant in both the reaction wood area and the opposite wood area. There is a positive correlation between the angle and the axial shrinkage in the reaction wood area of poplars and pines. The relation between the angle and the axial shrinkage in the opposite wood area of poplars and pines in different angles can't be regressed by linear equations. The relation between the angle and the radial shrinkage in both the reaction wood area and the opposite wood area of poplars and pines can't be regressed by linear equations. The relation between the angle and the tangential shrinkage in both the reaction wood area and the opposite wood area of poplars and pines can be regressed by linear equations. There is a positive correlation between angles and tangential shrinkages in poplars, and there is a negative correlation between angles and tangential shrinkages in pines.5. The effect of the time on the growth character of the reaction wood: Results of the variance analysis of the relation between the time and the tree height of every angle are significant in poplars except the group of 60°; Results of the variance analysis of the relation between the time and the tree height of every angle are significant in pines except the group of 15°. Results of the regression analysis of the relation between the time and the tree height of every angle are not significant in poplars; there is a positive correlation between the time and the tree height of every angle in pines. Results of the variance analysis of the relation between the time and the tree base diameter of every angle are significant in poplars except the group of 60°; Results of the variance analysis of the relation between the time and the tree base diameter of every angle are significant in pines except the group of 0°and 30°. Results of the regression analysis show that there is a positive correlation between tree base diameters and times in poplars and pines.6. The effect of the time on the growth strain of the reaction wood: Results of the variance analysis of the relation between the time and the growth strain of every angle are significant in poplars and pines. The relation between the time and the growth strain absolute size of poplars and pines can't be regressed by linear equations.7. The effect of the time on the basic density of the reaction wood: The basic density of poplars and pines in the reaction wood area are both larger than the opposite wood area. Results of the variance analysis of the relation between the time and the basic density are significant except results in the opposite wood area of pines. The relation between the time and the basic density of poplars and pines can't be regressed by linear equations.8. The effect of the time on the shrinkage property of the reaction wood: Results of the variance analysis of the relation between the time and the axial shrinkage of poplars are significant in both the tension wood area and the opposite wood area. Results of the variance analysis of the relation between the time and the axial shrinkage of pines are not significant in both the tension wood area and the opposite wood area. Results of the variance analysis of the relation between the time and the radial shrinkage of poplars and pines are significant in the reaction wood area and results are not significant in the opposite wood area. Results of the variance analysis of the relation between the time and the tangential shrinkage of poplars are not significant in both the tension wood area and the opposite wood area. Results of the variance analysis of the relation between the time and the tangential shrinkage of pines are significant in both the compression wood area and the opposite wood area. Only the relation between the time and the axial shrinkage of poplars in the reaction wood area and the tangential shrinkage of pines in opposite wood area can be regressed by linear equations. There is a positive correlation between the time and the axial shrinkage of poplars in the reaction wood area. There is a negative correlation between the time and the tangential shrinkage of pines in the opposite wood area.9. The effect of the grow strain on the basic density and the shrinkage property of the reaction wood: There is a positive correlation between the growth strain absolute size and the basic density of poplars and pines. There is a positive correlation between the growth strain absolute size and the axial shrinkage, the radial shrinkage, the tangential shrinkage of poplars. There is a positive correlation between the growth strain absolute size and the axial shrinkage, the radial shrinkage of pines. There is a negative correlation between the growth strain absolute size and the tangential shrinkage of pines.